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Time-series and Phase-curve Photometry of the Episodically Active Asteroid (6478) Gault in a Quiescent State Using APO, GROWTH, P200, and ZTF

Purdum, JN, Lin, Z-Y, Bolin, BT, Sharma, K, Choi, PI, Bhalerao, V, Hanus, J, Kumar, H, Quimby, R, van Roestel, JC, Zhai, C, Fernandez, YR, Lisse, CM, Bodewits, D, Fremling, C, Ryan Golovich, N, Hsu, C-Y, Ip, W-H, Ngeow, C-C, Saini, NS , Shao, M, Yao, Y, Ahumada, T, Anand, S, Andreoni, I, Burdge, KB, Burruss, R, Chang, C-K, Copperwheat, CM, Coughlin, M, De, K, Dekany, R, Delacroix, A, Drake, A, Duev, D, Graham, M, Hale, D, Kool, EC, Kasliwal, MM, Kostadinova, IS, Kulkarni, SR, Laher, RR, Mahabal, A, Masci, FJ, Mroz, PJ, Neill, JD, Riddle, R, Rodriguez, H, Smith, RM, Walters, R, Yan, L and Zolkower, J (2021) Time-series and Phase-curve Photometry of the Episodically Active Asteroid (6478) Gault in a Quiescent State Using APO, GROWTH, P200, and ZTF. ASTROPHYSICAL JOURNAL LETTERS, 911 (2). ISSN 2041-8205

Time-series and pharsecurve photometry of epsidically-active asteroid (6478) gault in a quiescent state using APO, GROWTH, P200 and ZTF.pdf - Accepted Version

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We observed the episodically active asteroid (6478) Gault in 2020 with multiple telescopes in Asia and North America and found that it is no longer active after its recent outbursts at the end of 2018 and the start of 2019. The inactivity during this apparition allowed us to measure the absolute magnitude of Gault of Hr = 14.63 ± 0.02, Gr = 0.21 ± 0.02 from our secular phase-curve observations. In addition, we were able to constrain Gault's rotation period using time-series photometric lightcurves taken over 17 hr on multiple days in 2020 August, September, and October. The photometric lightcurves have a repeating ≲0.05 mag feature suggesting that (6478) Gault has a rotation period of ∼2.5 hr and may have a semispherical or top-like shape, much like the near-Earth asteroids Ryugu and Bennu. The rotation period of ∼2.5 hr is near the expected critical rotation period for an asteroid with the physical properties of (6478) Gault, suggesting that its activity observed over multiple epochs is due to surface mass shedding from its fast rotation spin-up by the Yarkovsky–O'Keefe–Radzievskii–Paddack effect.

Item Type: Article
Uncontrolled Keywords: Astronomy & Astrophysics; ASTROPY; COMET; ORIGIN; Physical Sciences; REGOLITH; Science & Technology; YARKOVSKY; Science & Technology; Physical Sciences; Astronomy & Astrophysics; COMET; YARKOVSKY; REGOLITH; ASTROPY; ORIGIN; 0201 Astronomical and Space Sciences; Astronomy & Astrophysics
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
SWORD Depositor: A Symplectic
Date Deposited: 21 Nov 2022 16:02
Last Modified: 21 Nov 2022 16:15
DOI or ID number: 10.3847/2041-8213/abf2ca
URI: https://researchonline.ljmu.ac.uk/id/eprint/18173
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