Main-belt asteroids in the K2 Uranus field

Abstract

We present the K2 light curves of a large sample of untargeted Main Belt asteroids (MBAs) detected with the Kepler space telescope. The asteroids were observed within the Uranus superstamp, a relatively large, continuous field with low stellar background designed to cover the planet Uranus and its moons during Campaign 8 of the K2 mission. The superstamp offered the possibility to obtain precise, uninterrupted light curves of a large number of MBAs and thus to determine unambiguous rotation rates for them. We obtained photometry for 608 MBAs, and were able to determine or estimate rotation rates for 90 targets, of which 86 had no known values before. In an additional 16 targets we detected incomplete cycles and/or eclipse-like events. We found the median rotation rate to be significantly longer than that of the ground-based observations indicating that the latter are biased towards shorter rotation rates. Our study highlights the need and benefits of further continuous photometry of asteroids.

14 pages, 10 figures, plus an 11-page appendix with light curve plots, accepted for publication in ApJS. Light curve data accessible from: http://konkoly.hu/KIK/data_en.html#K2_MB_ast. Changes to v1 (submitted version): more detailed statistics, to v2: added this link to our video of the asteroids passing through during the campaign: https://www.youtube.com/watch?v=gBQbyl1SM-w

References in corpus (22)

• The NumPy array: a structure for efficient numerical computation
• The K2 Mission: Characterization and Early results
• KEPLER's First Rocky Planet: Kepler-10b
• Planetary Candidates Observed by Kepler. VII. The First Fully Uniform Catalog Based on The Entire 48 Month Dataset (Q1-Q17 DR24)
• Interstellar Interloper 1I/2017 U1: Observations from the NOT and WIYN Telescopes
• A Catalog of Kepler Habitable Zone Exoplanet Candidates
• Densities of Solar System Objects from their Rotational Lightcurves
• The Outer Solar System Origins Survey: I. Design and First-Quarter Discoveries
• Col-OSSOS: Colors of the Interstellar Planetesimal 1I/`Oumuamua
• Neptune's Dynamic Atmosphere from Kepler K2 Observations: Implications for Brown Dwarf Light Curve Analyses
• The heart of the swarm: K2 photometry and rotational characteristics of 56 Jovian Trojan asteroids
• Large size and slow rotation of the trans-Neptunian object (225088) 2007 OR10 discovered from Herschel and K2 observations
• Prediction of transits of solar system objects in Kepler/K2 images: An extension of the Virtual Observatory service SkyBoT
• Photometric survey, modelling, and scaling of long-period and low-amplitude asteroids
• Uninterrupted optical light curves of main-belt asteroids from the K2 Mission
• Main-Belt Asteroids in the K2 Engineering Field of View
• Extracting Microlensing Signals from K2 Campaign 9
• Nereid from space: Rotation, size and shape analysis from Kepler/K2, Herschel and Spitzer observations
• Pushing the limits: K2 observations of the trans-Neptunian objects 2002 GV31 and (278361) 2007 JJ43
• Properties of the irregular satellite system around Uranus inferred from K2, Herschel and Spitzer observations
• A Distant Mirror: Solar Oscillations Observed on Neptune by the Kepler K2 Mission
• Time-Series Analysis of Broadband Photometry of Neptune from K2

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• OSSOS. VII. 800+ trans-Neptunian objects - the complete data release
• Solar System objects observed with TESS -- First data release: bright main-belt and Trojan asteroids from the Southern Survey
• Primeval very low-mass stars and brown dwarfs - IV. New L subdwarfs, Gaia astrometry, population properties, and a blue brown dwarf binary
• Thermal properties of slowly rotating asteroids: Results from a targeted survey
• The Random Transiter -- EPIC 249706694/HD 139139
• 101 Trojans: a tale of period bimodality, binaries, and extremely slow rotators from K2 photometry
• TESS in the Solar System
• Rotational properties of Hilda asteroids observed by the K2 mission
• Discovery of Super-Slow Rotating Asteroids with ATLAS and ZTF photometry
• The visible and thermal light curve of the large Kuiper belt object (50000) Quaoar
• Scaling slowly rotating asteroids by stellar occultations
• Light curves of ten Centaurs from K2 measurements
• Light curves of transneptunian objects from the K2 mission of the Kepler Space Telescope
• Identification of asteroids using the Virtual Observatory: the WFCAM Transit Survey
• Determination of rotation periods for a large sample of asteroids from K2 Campaign 9
• To Grow Old and Peculiar: A Survey of Anomalous Variable Stars in M80 and Age Determination using K2 and Gaia
• Matching seismic masses for RR Lyrae-type and oscillating red horizontal-branch stars in M4
• Measuring Asteroid Rotation Periods Using the KMTNet Bulge Survey Data