The Fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)

Abstract

The fourth United States Naval Observatory (USNO) CCD Astrograph Catalog, UCAC4 was released in August 2012 (double-sided DVD and CDS data center Vizier catalog I/322). It is the final release in this series and contains over 113 million objects; over 105 million of them with proper motions. UCAC4 is an updated version of UCAC3 with about the same number of stars also covering all-sky. Bugs were fixed, Schmidt plate survey data were avoided, and precise 5-band photometry were added. Astrograph observations have been supplemented for bright stars by FK6, Hipparcos and Tycho-2 data to compile a UCAC4 star catalog complete to about magnitude R = 16. Epoch 1998 to 2004 positions are obtained from observations with the 20 cm aperture USNO Astrograph's red lens, equipped with a 4k by 4k CCD. Mean positions and proper motions are derived by combining these observations with over 140 ground- and space-based catalogs, including Hipparcos/Tycho and the AC2000.2, as well as unpublished measures of over 5000 plates from other astrographs. For most of the faint stars the first epoch plates from the Southern Proper Motion (SPM) and the Northern Proper Motion (NPM) programs form the basis for proper motions. These data are supplemented by 2MASS near-IR photometry for about 110 million stars and 5-band (B,V,g,r,i) APASS data for over 51 million stars. Thus the published UCAC4, as were UCAC3 and UCAC2, is a compiled catalog with the UCAC observational program being a major component. The positional accuracy of stars in UCAC4 at mean epoch is about 15 to 100 mas per coordinate, depending on magnitude, while the formal errors in proper motions range from about 1 to 10 mas/yr depending on magnitude and observing history. Systematic errors in proper motions are estimated to be about 1 to 4 mas/yr.

14 pages, 25 figures, accepted by AJ

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• Age spreads and the temperature dependence of age estimates in Upper Sco
• Parallax Results From URAT Epoch Data
• A nearby young M dwarf with a wide, possibly planetary-mass companion
• The X-ray light curve of the massive colliding wind Wolf-Rayet + O binary WR21a
• System IMF of the 25 Ori Group from Planetary-Mass Objects to Intermediate/High-Mass Stars
• Extracting Microlensing Signals from K2 Campaign 9
• A survey for planetary-mass brown dwarfs in the Chamaeleon I star-forming region
• Optical Studies of Thirteen Hard X-ray Selected Cataclysmic Binaries from the Swift-BAT Survey
• The ESA Gaia Archive: Data Release 1
• The JCMT Gould Belt Survey: Evidence for radiative heating in Serpens MWC 297 and its influence on local star formation
• NGTS-6b: An Ultra Short Period Hot-Jupiter Orbiting an Old K Dwarf
• HAZMAT. VII. The Evolution of Ultraviolet Emission with Age and Rotation for Early M Dwarf Stars
• The VISTA Orion mini-survey: star formation in the Lynds 1630 North cloud
• RR Lyrae stars and the horizontal branch of NGC 5904 (M5)
• The compact multiple system HIP 41431
• Discovery of an unusual bright eclipsing binary with the longest known period: TYC 2505-672-1 / MASTER OT J095310.04+335352.8
• The perihelion activity of comet 67P/Churyumov-Gerasimenko as seen by robotic telescopes
• A Survey of Irradiated Pillars, Globules, and Jets in the Carina Nebul
• South Galactic Cap u-band Sky Survey (SCUSS): Data Reduction
• Saturn's inner satellites : orbits, masses and the chaotic motion of Atlas from new Cassini imaging observations
• Spitzer Observations of the North Ecliptic Pole
• Observation of Two New L4 Neptune Trojans in the Dark Energy Survey Supernova Fields
• Revisiting the variable star population in NGC~6229 and the structure of the Horizontal Branch
• The First Data Release of the Beijing-Arizona Sky Survey
• The kinematic signature of the Galactic warp in Gaia DR1 - I. The Hipparcos subsample
• Wide-Field Optical Spectroscopy of Abell 133: A Search for Filaments Reported in X-ray Observations
• High-resolution Imaging of Transiting Extrasolar Planetary systems (HITEP). II. Lucky Imaging results from 2015 and 2016
• 1SWASP J093010.78+533859.5: A Possible Hierarchical Quintuple System
• Radio-Optical Reference Frame Link Using the US Naval Observatory Astrograph and Deep CCD Imaging
• The Absolute Magnitude of RRc Variables From Statistical Parallax
• Effects of the selection function on metallicity trends in spectroscopic surveys of the Milky Way
• The Optical Counterpart to the Accreting Millisecond X-ray Pulsar SAX J1748.9-2021 in the Globular Cluster NGC 6440
• Shallow transit follow-up from NGTS: simultaneous observations of HD106315 with 11 identical telescopes
• Westerlund 1 under the light of Gaia EDR3: Distance, isolation, extent, and a hidden population
• Small Bodies Near and Far (SBNAF): a benchmark study on physical and thermal properties of small bodies in the Solar System
• Speckle Interferometry of Red Dwarf Stars
• Magnetic field and prominences of the young, solar-like, ultra-rapid rotator V530 Per
• Astrometric positions for 18 irregular satellites of giant planets from 23 years of observations
• Data preparation for asteroseismology with TESS
• Brightness variations of the FUor-type eruptive star V346 Nor
• A revised moving cluster distance to the Pleiades open cluster
• An UXor among FUors: extinction related brightness variations of the young eruptive star V582 Aur
• The earliest O-type eclipsing binary in the Small Magellanic Cloud, AzV 476: A comprehensive analysis reveals surprisingly low stellar masses
• HD 202206 : A Circumbinary Brown Dwarf System
• RAVE stars tidally stripped/ejected from $\omega$ Centauri globular cluster
• Revisiting the Stellar Velocity Ellipsoid - Hubble type relation: observations versus simulations
• Open clusters and associations in the Gaia era
• Discovery and mass measurement of the hot, transiting, Earth-sized planet GJ 3929 b
• Planet Hunters TESS IV: A massive, compact hierarchical triple star system TIC 470710327
• Asteroid (3200) Phaethon: colors, phase curve, limits on cometary activity and fragmentation
• Two Hot Jupiters from K2 Campaign 4
• The Spitzer-HETDEX Exploratory Large Area Survey II: Dark Energy Camera and Spitzer/IRAC Multiwavelength Catalog
• Nine new open clusters within 500 pc from the Sun
• UCAC4 Nearby Star Survey: A Search for Our Stellar Neighbors
• A Bright Short Period M-M Eclipsing Binary from the KELT Survey: Magnetic Activity and the Mass-Radius Relationship for M-dwarfs
• Observations of the M82 SN 2014J with the Kilodegree Extremely Little Telescope
• Investigating dynamical properties of evolved Galactic open clusters
• On the Identification of Wide Binaries in the Kepler Field
• HD 99458: First time ever Ap-type star as a $\delta$ Scuti pulsator in a short period eclipsing binary?
• Variable Stars Observed in the Galactic Disk by AST3-1 from Dome A, Antarctica
• The CARMENES search for exoplanets around M dwarfs: Spectroscopic orbits of nine M-dwarf multiple systems, including two triples, two brown dwarf candidates, and one close M-dwarf-white dwarf binary
• A Transient Transit Signature Associated with the Young Star RIK-210
• Highly dynamically evolved intermediate-age open clusters
• Rotation Periods of Wide Binaries in the Kepler Field
• Red Clump Stars from the LAMOST data I: identification and distance
• Gaia Focused Product Release: Asteroid orbital solution. Properties and assessment
• Asteroseismology of luminous red giants with Kepler. II. Dependence of mass loss on pulsations and radiation
• A search for pulsations in the HgMn star HD 45975 with CoRoT photometry and ground-based spectroscopy
• Simultaneous spectral energy distribution and near-infrared interferometry modeling of HD 142666
• The local standard of rest from data on young objects with account for the Galactic spiral density wave
• Kinematic Analysis of Solar-Neighborhood Stars Based on RAVE4 Data
• X-Shooting ULLYSES: Massive Stars at low metallicity II. DR1: Advanced optical data products for the Magellanic Clouds
• A Search for short-period Rocky Planets around WDs with the Cosmic Origins Spectrograph (COS)
• Two super-Earths at the edge of the habitable zone of the nearby M dwarf TOI-2095
• A GALEX based search for the sparse young stellar population in the Taurus-Aurigae star forming region
• A method of immediate detection of objects with a near-zero apparent motion in series of CCD-frames
• ACCESS: Confirmation of a Clear Atmosphere for WASP-96b and a Comparison of Light Curve Detrending Techniques
• Light curves of the latest FUor: Indication of a close binary
• Local Stellar Kinematics from RAVE data - VII. Metallicity Gradients from Red Clump Stars
• The imprints of the Galactic bar on the thick disk with RAVE
• Clusterix 2.0. A Virtual Observatory tool to estimate cluster membership probability
• CCD UBV photometric study of five open clusters - Dolidze 36, NGC 6728, NGC 6800, NGC 7209 and Platais 1
• Multiplicity of disc-bearing stars in Upper Scorpius and Upper Centaurus-Lupus
• Update of membership and mean proper motion of open clusters from UCAC5 catalog
• The Late-Type Extension to MoVeRS (LaTE-MoVeRS): Proper motion verified low-mass stars and brown dwarfs from SDSS, 2MASS, and WISE
• Large proper motion of the Thorne-Żytkow object candidate HV 2112 reveals its likely nature as foreground Galactic S-star
• Deep secrets of intermediate-mass giants and supergiants: Models with rotation seem to overestimate mixing effects on the surface abundances of C, N, and Na
• The First High-Phase Observations of a KBO: New Horizons Imaging of (15810) 1994 JR1 from the Kuiper Belt
• A code for robust astrometric solution of astronomical images
• The Nearest Neutron Star Candidate in a Binary Revealed by Optical Time-domain Surveys
• Rotational and Radial Velocities of 1.3-2.2 M_Sun Red Giants in Open Clusters
• Pluto's ephemeris from ground-based stellar occultations (1988-2016)
• Constraints on the structure and seasonal variations of Triton's atmosphere from the 5 October 2017 stellar occultation and previous observations
• Discovery of one neutron star candidate from radial velocity monitoring
• Multiply eclipsing candidates from the TESS satellite
• The W UMa binaries USNO-A2.0 1350-17365531, V471 Cas, V479 Lac and V560 Lac: light curve solutions and global parameters based on the GAIA distances
• New insights into the outflows from R Aquarii
• Bayesian assessment of moving group membership: importance of models and prior knowledge
• Shape models of asteroids based on lightcurve observations with BlueEye600 robotic observatory
• SOAR optical and near-infrared spectroscopic survey of newly discovered massive stars in the periphery of Galactic Massive star clusters I - NGC3603
• Characterization of the K2-19 Multiple-Transiting Planetary System via High-Dispersion Spectroscopy, AO Imaging, and Transit Timing Variations
• Cepheid Kinematics and the Galactic Warp
• TOI-4010: A System of Three Large Short-Period Planets With a Massive Long-Period Companion
• Identification of Globular Cluster Stars in RAVE data II: Extended tidal debris around NGC 3201
• The blue supergiant MN18 and its bipolar circumstellar nebula
• The Gaia-ESO Survey: The analysis of the hot-star spectra
• Evidence for Halo Kinematics among Cool Carbon-Rich Dwarfs
• Very Low Mass Stellar and Substellar Companions to Solar-Like Stars From MARVELS V: A Low Eccentricity Brown Dwarf from the Driest Part of the Desert, MARVELS-6b
• Discovery of New Companions to High Proper Motion Stars from the VVV Survey
• Dynamical Masses of Young Stars II: Young Taurus Binaries Hubble~4, FF~Tau, and HP~Tau/G3
• ACCESS: Confirmation of no potassium in the atmosphere of WASP-31b
• Towards the origin of the radio emission in AR Sco, the first radio-pulsing white dwarf binary
• Precise CCD positions of Triton in 2014-2016 using the newest Gaia DR1 star catalogue
• Will Comet 209P/LINEAR Generate the Next Meteor Storm?
• TYC 3159-6-1: a runaway blue supergiant
• The Inner Disk and Accretion Flow of the Close Binary DQ Tau
• Ground-based optical transmission spectrum of the hot Jupiter HAT-P-1b
• New Red Jewels in Coma Berenices
• HATS-47b, HATS-48Ab, HATS-49b and HATS-72b: Four Warm Giant Planets Transiting K Dwarfs
• A photometric study of the Open Cluster II: Stellar population and dynamical evolution in NGC 559
• Precise mass determination for the keystone sub-Neptune planet transiting the mid-type M dwarf G 9-40
• GJ 806 (TOI-4481): A bright nearby multi-planetary system with a transiting hot, low-density super-Earth
• Gemini and Lowell Observations of 67P/Churyumov-Gerasimenko During the Rosetta Mission
• The CARMENES search for exoplanets around M dwarfs Detection of a mini-Neptune around LSPM J2116+0234 and refinement of orbital parameters of a super-Earth around GJ 686 (BD+18 3421)
• Photoelectric search for peculiar stars in open clusters. XV. Feinstein 1, NGC 2168, NGC 2323, NGC 2437, NGC 2547, NGC 4103, NGC 6025, NGC 6633, Stock 2, and Trumpler 2
• Metal-Rich RRc stars in the Carnegie RR Lyrae Survey
• The Nucleus of the Planetary Nebula EGB 6 as a Post-Mira Binary
• A Global Correction to PPMXL Proper Motions
• SN 2020bio: A Double-peaked, H-poor Type IIb Supernova with Evidence of Circumstellar Interaction
• A search for new hot subdwarf stars by means of Virtual Observatory tools II
• The shared evaporation history of three sub-Neptunes spanning the radius-period valley of a Hyades star
• Image Subtraction Reduction of Open Clusters M35 & NGC 2158 In The K2 Campaign-0 Super-Stamp
• Identifying Bound Stellar Companions to Kepler Exoplanet Host Stars Using Speckle Imaging
• Ultracool dwarf benchmarks with \emph{Gaia} primaries
• Kinematics of the Optically Visible YSOs Toward the Orion B Molecular Cloud
• Proper motions of young stars in Chamaeleon. II. New kinematical candidate members of Chamaeleon I and II
• Local Stellar Kinematics from RAVE data - VI. Metallicity Gradients Based on the F-G Main-sequence Stars
• Motion Verified Red Stars (MoVeRS): A Catalog of Proper Motion Selected Low-mass Stars from WISE, SDSS, and 2MASS
• Cardinal kinematics: I. Rotation fields of the APOGEE Survey
• New halo stars of the Galactic globular clusters M3 and M13 in the LAMOST DR1 Catalog
• A new photometric and dynamical study of the eclipsing binary star HW Virginis
• USco1621 B and USco1556 B: Two wide companions at the deuterium-burning mass limit in Upper Scorpius
• Apsidal motion in massive eccentric binaries: The case of CPD-41${}^{\circ }$7742, and HD 152218 revisited
• Gaia Focused Product Release: Sources from Service Interface Function image analysis -- Half a million new sources in omega Centauri
• A Critique of the Spite Plateau, and the Astration of Primordial Lithium
• Photometric calibration for the Beijing-Arizona Sky Survey and Mayall z-band Legacy Survey
• The variability behavior of CoRoT M-giant Stars
• Statistics of wide pre-main sequence binaries in the Orion OB1 association
• The universality of the rapid neutron-capture process revealed by a possible disrupted dwarf galaxy star
• A Quintuple Star System Containing Two Eclipsing Binaries
• A Survey for High-Mass Eclipsing Binaries
• HATS-37Ab and HATS-38b: Two Transiting Hot Neptunes in the Desert
• Extended Red Objects and Stellar Wind Bow Shocks in the Carina Nebula
• Planetesimals Around Stars with TESS (PAST): II. An M Dwarf "Dipper" Star with a Long-Lived Disk in the TESS Continuous Viewing Zone
• JWST observations of stellar occultations by solar system bodies and rings
• WASP-135b: a highly irradiated, inflated hot Jupiter orbiting a G5V star
• Discovery of wide low and very low-mass binary systems using Virtual Observatory tools
• Phoebe's orbit from ground-based and space-based observations
• Towards a comprehensive knowledge of the open cluster Haffner 9
• The M dwarf problem: Fe and Ti abundances in a volume-limited sample of M dwarf stars
• The OPD Photometric Survey of Open Clusters II. robust determination of the fundamental parameters of 24 open clusters
• Optical and radio astrometry of the galaxy associated with FRB150418
• Refining the origins of the gamma-ray binary 1FGL J1018.6-5856
• Two planetary systems with transiting Earth-size and super-Earth planets orbiting late-type dwarf stars
• MagAO: Status and Science
• New cluster members and halo stars of the Galactic globular cluster NGC 1851
• HST astrometry in the 30 Doradus region: measuring proper motions of individual stars in the Large Magellanic Cloud
• Ghosts of Milky Way's past: the globular cluster ESO 37-1 (E 3)
• A cautionary tale of interpreting O-C diagrams: period instability in a classical RR Lyr Star Z CVn mimicking as a distant companion
• Comprehensive UV and Optical spectral analysis of Cygnus X-1: Stellar and wind parameters, abundances, and evolutionary implications
• The astrometric Gaia-FUN-SSO observation campaign of 99 942 Apophis
• Multiplicity of stars with planets in the solar neighbourhood
• VVV High proper motion stars I. The catalogue of bright Ks < 13.5 stars
• A dense mini-Neptune orbiting the bright young star HD 18599
• Astrometry of the main satellites of Uranus: 18 years of observations
• CTIO, ROSAT HRI and Chandra ACIS Observations of the Archetypical Mixed-Morphology Supernova Remnant W28 (G6.4-0.1)
• Stellar Flares in the CSTAR Field: Results from the 2008 Data Set
• Rotationally modulated variability and pulsations of the He-rich star CPD -62 2124 with an extraordinarily strong magnetic field
• K2-113b: A dense hot-Jupiter transiting a solar analogue
• Deep VLA Images of the HH 124 IRS Radio Cluster and its Surroundings and a New Determination of the Distance to NGC 2264
• Close encounters involving RAVE stars beyond the 47 Tucanae tidal radius
• The proper motion of HV2112: A TŻO candidate in the SMC
• Wide-field adaptive optics performance in cosmological deep fields for multi-object spectroscopy with the European Extremely Large Telescope
• Hyades Member K2-136c: The Smallest Planet in an Open Cluster with a Precisely Measured Mass
• A Combined Chandra and LAMOST Study of Stellar Activity
• Life after eruption - IV. Spectroscopy of 13 old novae
• New Parallaxes for the Upper Scorpius OB Association
• Are the gyro-ages of field stars underestimated?
• A Search For X-ray Emission From Colliding Magnetospheres In Young Eccentric Stellar Binaries
• An ancient F-type subdwarf from the halo crossing the Galactic plane
• Characterisation of a candidate dual AGN
• Radial velocity homogeneous analysis of M dwarfs observed with HARPS I. Exoplanet detection and candidates
• High proper motion X-ray binaries from the Yale Southern Proper Motion Survey
• Detection of new eruptions in the Magellanic Clouds LBVs R 40 and R 110
• The large gamma-ray flare of the FSRQ PKS 0346-27
• Asymmetric metallicity patterns in the stellar velocity space with RAVE
• Component masses of young, wide, non-magnetic white dwarf binaries in the SDSS DR7
• Open Clusters in the Kepler Field, II. NGC 6866
• Hypervelocity star candidates from Gaia DR2 and DR3 proper motions and parallaxes
• HAT-P-58b -- HAT-P-64b: Seven Planets Transiting Bright Stars
• A deep and wide-field view at the IC 2944 / 2948 complex in Centaurus
• An optical search for transients lasting a few seconds
• Results of two multi-chord stellar occultations by dwarf planet (1) Ceres
• On the Hubble Space Telescope Trigonometric Parallax of the Dwarf Nova SS Cygni
• A Global Astrometric Solution for Pan-STARRS referenced to ICRF2
• Chemical composition of giant stars in the open cluster IC 4756
• Autonomous Detection of Particles and Tracks in Optical Images
• Discovery of Nine Super Li-rich Unevolved Stars from the LAMOST Survey
• Local Stellar Kinematics from RAVE data -- VIII. Effects of the Galactic Disc Perturbations on Stellar Orbits of Red Clump Stars
• Photometric observations and light curve solutions of the W UMa stars NSVS 2244206, NSVS 908513, CSS J004004.7+385531 and VSX J062624.4+570907
• A spectroscopic and kinematic survey of fast hot subdwarfs
• Photometry of comet 29P/Schwassmann-Wachmann 1 in 2012-2019
• Discovery of a new bona fide luminous blue variable in Norma
• Direct Imaging discovery of a second planet candidate around the possibly transiting planet host CVSO 30
• XMM-Newton observation of the interacting galaxies NGC1512 and NGC1510
• Young and Intermediate-age Distance Indicators
• NGC 1252: a high altitude, metal poor open cluster remnant
• The Closest M-Dwarf Quadruple System to the Sun
• 44 New & Known M Dwarf Multiples In The SDSS-III/APOGEE M Dwarf Ancillary Science Sample
• Constraints on the Surface Magnetic Fields and Age of a Cool Hypergiant: XMM-Newton X-ray Observations of VY CMa
• The Galactic Kinematics of Cataclysmic Variables
• On the contribution of ULXs to stellar feedback: an intermediate mass black hole candidate and the population of ULXs in the low-metallicity starburst galaxy ESO 338-4
• The HATNet and HATSouth Exoplanet Surveys
• Quiescent NIR and optical counterparts to candidate black hole X-ray binaries
• Detection of seven 2+2 doubly eclipsing quadruple systems
• J-GEM optical and near-infrared follow-up of gravitational wave events during LIGO's and Virgo's third observing run
• Searching For Fermi GRB Optical Counterparts With The Prototype Gravitational-Wave Optical Transient Observer (GOTO)
• BAT99 126: A multiple Wolf-Rayet system in the Large Magellanic Cloud with a massive near-contact binary
• Multiple Outflows in the Giant Eruption of a Massive Star
• Probing Saraswati's heart: evaluating the dynamical state of the massive galaxy cluster A2631 through a comprehensive weak-lensing and dynamical analysis
• Monitoring of transiting exoplanets and their host stars with small aperture telescopes
• Eclipsing binaries in the open cluster Ruprecht 147. II: EPIC 219568666
• Overlooked wide companions of nearby F stars
• Magnetic field geometry and chemical abundance distribution of the He-strong star CPD -57 3509
• Photometry of some more neglected bright cataclysmic variables and candidates
• Searching for new young stars in the northern hemisphere: The Pisces Moving Group
• Galactic Kinematics Derived from Data in the RAVE5, UCAC4, PPMXL, and Gaia TGAS Catalogs
• The SERMON project: 48 new field Blazhko stars and an investigation of modulation-period distribution
• Variable stars in the bulge globular cluster NGC 6401
• A probable pre-main sequence chemically peculiar star in the open cluster Stock 16
• The First AllWISE Proper Motion Discovery: WISEA J070720.50+170532.7
• Variation of the ultraviolet extinction law across the Taurus-Auriga star forming complex. A GALEX based study
• Radial velocities and metallicities from infrared Ca II triplet spectroscopy of open clusters II. Berkeley 23, King 1, NGC 559, NGC 6603 and NGC 7245
• Photometric and proper motion study of neglected open cluster NGC 2215
• Sub-arcsecond high sensitivity measurements of the DG~Tau jet with e-MERLIN
• The Peculiar Photometric Properties of 2010 WG9: A Slowly-Rotating Trans-Neptunian Object from the Oort Cloud
• Two's company, three's a crowd: SALT reveals the likely triple nature of the nucleus of the extreme abundance discrepancy factor planetary nebula Sp 3
• The Global sphere reconstruction (GSR) - Demonstrating an independent implementation of the astrometric core solution for Gaia
• Swift J0513.4-6547 = LXP 27.2 : a new Be/X-ray binary system in the Large Magellanic Cloud
• Seimei KOOLS-IFU Mapping of the Gas and Dust Distributions in Galactic Planetary Nebulae: the Case of IC2165
• The first observed stellar occultations by the irregular satellite (Saturn IX) Phoebe and improved rotational period
• Updated orbital monitoring and dynamical masses for nearby M-dwarf binaries
• A method for determining the radius of an open cluster from stellar proper motions
• A catalogue of open cluster radii determined from Gaia proper motions
• Time resolved spectroscopy and photometry of three little known bright cataclysmic variables: LS IV -08${}^{\mathrm{o}}$ 3, HQ Monocerotis and ST Chamaeleontis
• The GALAH Survey: Relative throughputs of the 2dF fibre positioner and the HERMES spectrograph from stellar targets
• Multiplexing Precision RVs: Searching for Close in Gas Giants in Open Clusters
• Young Stellar Object candidates toward the Orion region selected from GALEX
• Orientation Parameters of the Cepheid System in the Galaxy
• A Study of the Magnetic Activity and Variability of GJ 436
• A bag of tricks: Using proper motions of Galactic stars to identify the Hercules ultra-faint dwarf galaxy members
• Orbital variations and outbursts of the unusual variable star V1129 Centauri
• Characterizing K2 Candidate Planetary Systems Orbiting Low-Mass Stars III: A High Mass & Low Envelope Fraction for the Warm Neptune K2-55b
• Star-forming regions at the periphery of the supershell surrounding the Cyg OB1 association. I. The star cluster vdB 130 and its ambient gas and dust medium
• New orbits of irregular satellites designed for the predictions of stellar occultations up to 2020, based on thousands of new observations
• Hunt for extremely eccentric eclipsing binaries
• Vertical Distribution and Kinematics of Planetary Nebulae in the Milky Way
• Insights into the properties of the Local (Orion) spiral arm. NGC 2302: First results and description of the program
• Quasi-automatic software support for Gaia ground based optical tracking
• Globules and pillars in Cygnus X. II. Massive star formation in the globule IRAS~20319+3958
• Gemini optical observations of binary millisecond-pulsars
• Dipper-like variability of the Gaia alerted young star V555 Ori
• An Investigation of the Absolute Proper Motions of the SCUSS Catalog
• The early-type near-contact binary system V337 Aql revisited
• Member candidates of the star clusters from LAMOST DR2 data
• Long-Period High-Amplitude Red Variables in the KELT Survey
• FRB Line-of-sight Ionization Measurement From Lightcone AAOmega Mapping Survey: the First Data Release
• The Mysterious Sickle Object in the Carina Nebula: A stellar wind induced bow shock grazing a clump?
• The Solar Neighborhood. XLIII: Discovery of New Nearby Stars with pm < 0.18 arcsec yr-1 (TINYMO sample)
• Variable Stars in Young Open Cluster NGC 2244
• Discovery of an Extremely r-process-enhanced Thin-disk Star with [Eu/H] = +0.78
• Chandra Observations of the field containing HESS J1616-508
• XMM-Newton view of X-ray overdensities from nearby galaxy clusters: the environmental dependencies
• UrHip Proper Motion Catalog
• Measurements of the Ca II infrared triplet emission lines of pre-main-sequence stars
• Emission-line stars in the LMC: the Armagh survey, and a metacatalogue
• Investigation of a transiting planet candidate in Trumpler 37: an astrophysical false positive eclipsing spectroscopic binary star
• Life after eruption - VI. Recovery of the old novae EL Aql, V606 Aql, V908 Oph, V1149 Sgr, V1583 Sgr and V3964 Sgr
• The GALAH Survey: Velocity fluctuations in the Milky Way using red clump giants
• TFAW survey. I. Wavelet-based denoising of K2 light curves. Discovery and validation of two new Earth-sized planets in K2 campaign 1
• Speckle Interferometry at the U.S. Naval Observatory. XXIII
• Searching for star-forming dwarf galaxies in the Antlia cluster
• TOI-4336 A b: A temperate sub-Neptune ripe for atmospheric characterization in a nearby triple M-dwarf system
• Determination of a temporally and spatially resolved Supernova rate from OB-stars within 5kpc
• The Lives of Stars: Insights From the TGAS-RAVE-LAMOST Dataset
• Astrometric observations of Phobos and Deimos during the 1971 opposition of Mars
• New orbit recalculations of comet C/1890 F1 Brooks and its dynamical evolution
• NGC 2548: clumpy spatial and kinematic structure in an intermediate-age galactic cluster
• LAMOST/HRS Spectroscopic Analysis of Two New Li-rich Giants
• The first study of four doubly eclipsing systems
• HST/COS Spectra of the Wind Lines of VFTS 102 and 285
• Spinning and color properties of the active asteroid (6478) Gault
• An M dwarf Companion to an F-type Star in a young main-sequence binary
• Photometry of the long period dwarf nova MU Centauri
• Life after eruption - V. Spectroscopy of eight candidate old novae with Gemini-South
• Light-time effect detected in fourteen eclipsing binaries
• Study of grain alignment efficiency and a distance estimate for small globule CB4
• Ultraviolet extinction properties of the 30 Dor Nebula and interpreting observations of starburst clusters
• Astrometry with PRAIA
• New Open Cluster Candidates Discovered in the XSTPS-GAC Survey
• The Emission Nebula Sh 2-174: A Radio Investigation of the Surrounding Region
• First frequency analysis for three new members of the group of eclipsing binaries with a pulsating component
• Photometry of some neglected bright cataclysmic variables and candidates
• Gaia Focused Product Release: A catalogue of sources around quasars to search for strongly lensed quasars
• Potential Interior Structures and Habitability of Super-Earth Exoplanets LHS 1140 b, K2-18 b, TOI-1452 b and TOI-1468 c
• Visual Orbits of Spectroscopic Binaries with the CHARA Array. IV. HD 61859, HD 89822, HD 109510, and HD 191692
• The oldest stars with low neutron-capture element abundances and origins in ancient dwarf galaxies
• Proper motions of five OB stars with candidate dusty bow shocks in the Carina Nebula
• Relationship between Radar Cross Section and Optical Magnitude based on Radar and Optical Simultaneous Observations of Faint Meteors
• ASTROPOP: the ASTROnomical POlarimetry and Photometry pipeline
• Spectro-photometric characterization of high proper motion sources from WISE
• A Technique to Derive Improved Proper Motions for Kepler Objects of Interest
• The Rotation Period Distribution in the Young Open Cluster NGC 6709
• The rotation-activity relation of M dwarfs: From K2 to TESS and PLATO
• Herbig-Haro objects and mid-infrared outflows in the Vela C molecular cloud
• Eight new 2+2 doubly eclipsing quadruple systems detected
• Photometric Investigation of the Total-Eclipsing Contact Binary V12 in the Intermediate-age Open Cluster NGC 7789
• A Chandra X-ray census of the interacting binaries in old open clusters - Collinder 261
• A transiting super-Earth close to the inner edge of the habitable zone of an M0 dwarf star
• Multiwavelength Observations of the Black Hole X-ray Binary MAXI J1820$+$070 in the Rebrightening Phase
• Two neighbours of the ultra-short-period Earth-sized planet K2-157 b in the warm Neptunian savanna
• The Habitability of GJ 357 d : Possible Climates and Observability
• Miscellaneous photometric variations in cataclysmic variables: V455 And, SS Cyg, AQ Men, LQ Peg, RW Tri and UX UMa
• Three-Dimensional Kinematics of Classical Cepheids
• Discovery of a pair of very metal-poor stars enriched in neutron-capture elements: The proto-disk r-II star BPS CS 29529-0089 and the Gaia-Sausage-Enceladus r-I star TYC 9219-2422-1
• DT Serpentis: neither a symbiotic star nor a planetary nebula associate
• VLT observations of the magnetar CXO J164710.2-455216 and the detection of a candidate infrared counterpart
• Improved astrometry for the Bohannan & Epps catalogue
• Vertical Distribution and Kinematics of Protoplanetary Nebulae in the Galaxy
• A reanalysis of the LHS 1140 b atmosphere observed with the Hubble Space Telescope
• Data Release of the AST3-2 Automatic Survey from Dome A, Antarctica
• On the physical reality of overlooked open clusters
• New insight into the massive eccentric binary HD 165052: self-consistent orbital solution, apsidal motion, and fundamental parameters
• Spectroscopic survey of faint planetary-nebula nuclei. II. The subdwarf O central star of Fr 2-30
• Microlens Surveys are a Powerful Probe of Asteroids
• How long can LBVs sleep? A long-term photometric vaiability and spectral study of the Galactic candidate luminous blue variable MN112
• HD 7977 and its possible influence on Solar System bodies
• A young spectroscopic binary in a quintuple system part of the Local Association
• Processing GOTO data with the Rubin Observatory LSST Science Pipelines I : Production of coadded frames
• A search of reactivated comets
• Lately Exposed Amorphous Water Ice on Comet 49P/Arend-Rigaux
• The multiplicity of ϕ Phe revisited
• Speckle Interferometry at the U.S. Naval Observatory. XXII
• TESS Discovery of Twin Planets near 2:1 Resonance around Early M-Dwarf TOI 4342
• Δμ Binaries among Stars with Large Proper Motions
• Photometry of the three eclipsing novalike variables EC 21178-5417, GS Pav and V345 Pav
• Direct Imaging Explorations for Companions around Mid-Late M Stars from the Subaru/IRD Strategic Program
• An astrometric and spectroscopic study of the $\delta$ Scuti variable HD21190 and its wide companion CPD -83${}^{\circ }$ 64B
• ASAS-SN Discovery of 4880 Bright RR Lyrae Variable Stars
• DECam Survey for Low-Mass Stars and Substellar Objects in the UCL and LCC Subgroups of the Sco-Cen OB Association (SCOCENSUS)
• Photometry of the long period dwarf nova GY Hya
• A transiting multi-planet system in the 61 million year old association Theia 116
• A Wide-Field Survey for Transiting Hot Jupiters and Eclipsing Pre-Main-Sequence Binaries in Young Stellar Associations
• Fixing the Reference Frame for PPMXL Proper Motions Using Extragalactic Sources
• The nature of the Cygnus extreme B-supergiant 2MASS J20395358+4222505
• A Chandra X-ray census of the interacting binaries in old open clusters - NGC188
• HST/FGS Trigonometric Parallaxes of M-dwarf Eclipsing Binaries
• A Tale of Three Dust Populations: Variable $R_{\mathrm{V}}$ and Extreme Polarization Along Sightlines Toward $\zeta$ Ophiuchi
• MegaPipe astrometry for the New Horizons spacecraft
• NLTE spectral analysis of the intermediate helium-rich subdwarf B star CPD-20°1123
• MANGOS II: Five new giant planets orbiting low-mass stars
• Hamburger Sternwarte plate archives: Historic long-term variability study of active galaxies based on digitized photographic plates
• ACRONYM IV: Three New, Young, Low-mass Spectroscopic Binaries
• Fundamental stellar parameters for selected T-Tauri stars in the Chamaeleon and Rho Ophiuchus star-forming regions
• Complex stellar system ESO65SC03: Open cluster or remnant?
• X-ray Activity from Different Types of Stars
• Absolute dimensions of the early F-type eclipsing binary V506 Ophiuchi
• A search for peculiar stars in the open cluster Hogg 16
• Optical linear polarization study towards Czernik 3 open cluster at different spatial scales
• Dark Energy Survey Year 1 Results: Photometric Data Set for Cosmology
• Maximizing Survey Volume for Large-Area Multi-Epoch Surveys with Voronoi Tessellation
• Variable stars detection in the field of open cluster NGC 188
• TOI-7166 b: A Habitable Zone mini-Neptune planet around a nearby low-mass star
• DART-Vetter: A Deep LeARning Tool for automatic triage of exoplanet candidates
• LAMOST 1: A Disrupted Satellite in the Constellation Draco
• The observed multiplicity properties of B-type stars in the Galactic young open cluster NGC 6231
• Spectroscopic and photometric analysis of 21 chromospherically active variables: activity cycles and differential rotation
• MG1-688432: A Peculiar Variable System
• Improved proper motion determinations for 15 open clusters based on the UCAC4 catalog
• On the age of the magnetically active WW Psa and TX Psa members of the beta Pictoris association
• Measurements of Chromospheric Mg I Emission Lines of Zero-Age Main-Sequence Stars
• A new estimate of the Local Standard of Rest from data on young Galactic objects
• Connecting the dots: Tracing the evolutionary pathway of Polar Ring Galaxies in the cases of NGC 3718, NGC 2685, and NGC 4262
• Towards Understanding the Nature of Young Detached Binary System HD 350731
• Circumstellar Medium Constraints on the Environment of Two Nearby Type Ia Supernovae: SN 2017cbv and SN 2020nlb
• The Stripped-Star Ultraviolet Magellanic Cloud Survey (SUMS): The UV Photometric Catalog and Stripped Star Candidate Selection
• The Implementation of Binned Kernel Density Estimation to Determine Open Clusters' Proper Motions: Validation of the Method
• Simultaneous photometric and CARMENES spectroscopic monitoring of fast-rotating M dwarf GJ 3270. Discovery of a post-flare corotating feature
• Surface activity of a Rossby sequence of cool Hyades stars
• Detecting Exoplanets Using Eclipsing Binaries as Natural Starshades
• ASTEP confirmation of a pair of long-period Jupiter-sized planets with extremely low densities transiting TOI-791
• An improved solution to geometric distortion using an orthogonal method
• High resolution observations of Cen A: Yellow and red supergiants in a region of jet-induced star formation?
• NGTS-EB-8: A double-lined eclipsing M+M binary discovered by citizen scientists
• A Sequoia stellar candidate with very high 7Li and 9Be
• Preliminary results of CCD observations of Himalia at Yunnan Observatories in 2015
• Gas-depleted planet formation occurred in the four-planet system around the red dwarf LHS 1903
• Examining the detectability of ringing on highly eccentric exoplanets
• Evidence for stellar contamination and water absorption in NGTS-5b's transmission spectra with GTC/OSIRIS
• Search for possibly evolutionary linked globular and open clusters
• Analysis of the multiple system with CP component phi Draconis
• Chromospheric Mg I Emission Lines of Pre-Main-Sequence Stars
• A compositional link between rocky exoplanets and their host stars
• SN 2021hpr: A Normal Type Ia Supernova Showing Excess Emission in the Early Rising Phase
• HAT-P-68b: A Transiting Hot Jupiter Around a K5 Dwarf Star
• Identification of Stellar Sequences in various Stellar Systems : ESO65-SC03, TEUTSCH 106, TURNER 6
• Consensus based Algorithm for Nonparametric Detection of Star Clusters (CANDiSC)
• Improved characterization of the TOI-2141 system: a dense sub-Neptune with non-transiting inner and outer companions
• Absolute physical parameters of three poorly studied detached eclipsing binaries
• Purveyors of fine halos III. Chemical abundance analysis of a potential omega Cen associate
• Study of the open cluster Alessi-Teutsch 9 (ASCC 10) using multiband photometry and Gaia EDR3
• Neutron-capture elements record the ordered chemical evolution of the disc over time
• Six new doubly eclipsing quadruples in a 2+2 architecture
• A new method to correct for host star variability in multi-epoch observations of exoplanet transmission spectra
• Computing Natural Magnitudes in the Photometric Systems of Astronomical Plates using Gaia DR3 SEDs
• Star formation in two irradiated globules around Cygnus OB2