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Discovery and dynamics of a Sedna-like object with a perihelion of 66 au
Ying-Tung Chen, Patryk Sofia Lykawka, Yukun Huang +30
Trans-Neptunian objects (TNOs) with large perihelion distances ( au) and semi-major axes ( au) provide insights into the early evolution of the solar system and th…
A low-inclination neutral Trans-Neptunian Object in a extreme orbit
Ying-Tung Chen, Marielle R. Eduardo, Marco A. Muñoz-Gutiérrez +3
We present photometric observations and numerical simulations of 2016 SD, a low inclination () extreme trans-Neptunian Object with a large semi-major axis ($…
The Lingering Death of Periodic Near-Sun Comet 323P/SOHO
Man-To Hui, David J. Tholen, Rainer Kracht +4
We observed near-Sun comet 323P/SOHO for the first time using ground and space telescopes. In late December 2020, the object was recovered at Subaru showing no cometary features on…
FOSSIL: I. The Spin Rate Limit of Jupiter Trojans
Chan-Kao Chang, Ying-Tung Chen, Wesley C. Fraser +25
Rotation periods of 53 small (diameters km) Jupiter Trojans (JTs) were derived using the high-cadence light curves obtained by the FOSSIL phase I survey, a Subaru/Hype…
Time-series and Phasecurve Photometry of Episodically-Active Asteroid (6478) Gault in a Quiescent State Using APO, GROWTH, P200 and ZTF
Josiah N. Purdum, Zhong-Yi Lin, Bryce T. Bolin +49
We observed Episodically Active Asteroid (6478) Gault in 2020 with multiple telescopes in Asia and North America and have found that it is no longer active after its recent outburs…
Initial Characterization of Active Transitioning Centaur, P/2019 LD2 (ATLAS), using Hubble, Spitzer, ZTF, Keck, APO and GROWTH Visible & Infrared Imaging and Spectroscopy
Bryce T. Bolin, Yanga R. Fernandez, Carey M. Lisse +43
We present visible and mid-infrared imagery and photometry of temporary Jovian co-orbital comet P/2019 LD taken with HST/WFC3, Spitzer/IRAC, the GROWTH telescope network, visib…
Characterization of Temporarily-Captured Minimoon 2020 CD by Keck Time-resolved Spectrophotometry
Bryce T. Bolin, Christoffer Fremling, Timothy R. Holt +42
We present time-resolved visible spectrophotometry of minimoon 2020 CD, the second asteroid known to become temporarily captured by the Earth-Moon system's gravitational field.…
Asteroid Discovery and Light Curve Extraction Using the Hough Transform -- A Rotation Period Study for Sub-Kilometer Main-Belt Asteroids
Kai-Jie Lo, Chan-Kao Chang, Hsing-Wen Lin +8
The intra-night trajectories of asteroids can be approximated by straight lines, and so are their intra-night detections. Therefore, the Hough transform, a line detecting algorithm…
Characterization of the Nucleus, Morphology and Activity of Interstellar Comet 2I/Borisov by Optical and Near-Infrared GROWTH, Apache Point, IRTF, ZTF and Keck Observations
Bryce T. Bolin, Carey M. Lisse, Mansi M. Kasliwal +52
We present visible and near-infrared photometric and spectroscopic observations of interstellar object 2I/Borisov taken from 2019 September 10 to 2019 November 29 using the GROWTH,…
Towards Efficient Detection of Small Near-Earth Asteroids Using the Zwicky Transient Facility (ZTF)
Quanzhi Ye, Frank J. Masci, Hsing Wen Lin +23
We describe ZStreak, a semi-real-time pipeline specialized in detecting small, fast-moving near-Earth asteroids (NEAs) that is currently operating on the data from the newly-commis…
Searching for Super-Fast Rotators Using the Pan-STARRS 1
Chan-Kao Chang, Hsing-Wen Lin, Wing-Huen Ip +9
A class of asteroids, called large super-fast rotators (large SFRs), have rotation periods shorter than 2 hours and diameters larger than ~ 0.3 km. They pose challenges to the usua…
Confirmation of Large Super-Fast Rotator (144977) 2005 EC127
Chan-Kao Chang, Hsing-Wen Lin, Wing-Huen Ip +7
(144977) 2005 EC127 is an V-/A-type inner-main-belt asteroid with a diameter of 0.6 +- 0.1 km. Asteroids of this size are believed to have rubble-pile structure, and, therefore, ca…
Large Super-Fast Rotator Hunting Using the Intermediate Palomar Transient Factory
Chan-Kao Chang, Hsing-Wen Lin, Wing-Huen Ip +5
In order to look for large super-fast rotators, five dedicated surveys covering ~ 188 square degree in the ecliptic plane have been carried out in R-band with ~10 min cadence using…
A Quick Test on Rotation Period Clustering for the Small Members of the Koronis Family
Chan-Kao Chang, Hsing-Wen Lin, Wing-Huen Ip
Rotation period clustering in prograde/retrograde rotators might indicate the preliminary indication of the Slivan state in the Koronis family as a result of the YORP effect. We fo…
Asteroid Spin-Rate Study using the Intermediate Palomar Transient Factory
Chan-Kao Chang, Wing-Huen Ip, Hsing-Wen Lin +10
Two dedicated asteroid rotation-period surveys have been carried out using data taken on January 6-9 and February 20-23 of 2014 by the Intermediate Palomar Transient Factory (iPTF)…
Asteroid lightcurves from the Palomar Transient Factory survey: Rotation periods and phase functions from sparse photometry
Adam Waszczak, Chan-Kao Chang, Eran O. Ofek +10
We fit 54,296 sparsely-sampled asteroid lightcurves in the Palomar Transient Factory to a combined rotation plus phase-function model. Each lightcurve consists of 20+ observations…
A New Large Super-Fast Rotator: (335433) 2005 UW163
Chan-Kao Chang, Adam Waszczak, Hsing-Wen Lin +5
Asteroids of size larger than 150 m generally do not have rotation periods smaller than 2.2 hours. This spin cutoff is believed to be due to the gravitationally bound rubble-pile s…
313 new asteroid rotation periods from Palomar Transient Factory observations
Chan-Kao Chang, Wing-Huen Ip, Hsing-Wen Lin +11
A new asteroid rotation period survey have been carried out by using the Palomar Transient Factory (PTF). Twelve consecutive PTF fields, which covered an area of 87 deg in the…