A1 Refereed original research article in a scientific journal
Implications for the Formation of (155140) 2005 UD from a New Convex Shape Model
Authors: Kueny Jay K, Chandler Colin Orion, Devogele Maxime, Moskovitz Nicholas, Pravec Petr, Kucakova Hana, Hornoch Kamil, Kusnirak Peter, Granvik Mikael, Konstantopoulou Christina, Jannsen Nicholas E, Moran Shane, Siltala Lauri, Fedorets Grigori, Ferrais Marin, Jehin Emmanuel, Kareta Theodore, Hanus Josef
Publisher: IOP Publishing Ltd
Publication year: 2023
Journal: The Planetary Science Journal
Journal name in source: PLANETARY SCIENCE JOURNAL
Journal acronym: PLANET SCI J
Article number: 56
Volume: 4
Issue: 3
Number of pages: 17
eISSN: 2632-3338
DOI: https://doi.org/10.3847/PSJ/acc1e7
Web address : https://iopscience.iop.org/article/10.3847/PSJ/acc1e7
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/179458971
(155140) 2005 UD has a similar orbit to (3200) Phaethon, an active asteroid in a highly eccentric orbit thought to be the source of the Geminid meteor shower. Evidence points to a genetic relationship between these two objects, but we have yet to fully understand how 2005 UD and Phaethon could have separated into this associated pair. Presented herein are new observations of 2005 UD from five observatories that were carried out during the 2018, 2019, and 2021 apparitions. We implemented light curve inversion using our new data, as well as dense and sparse archival data from epochs in 2005-2021, to better constrain the rotational period and derive a convex shape model of 2005 UD. We discuss two equally well-fitting pole solutions (lambda = 116.degrees 6, beta = -53.degrees 6) and (lambda = 300.degrees 3, beta = -55.degrees 4), the former largely in agreement with previous thermophysical analyses and the latter interesting due to its proximity to Phaethon's pole orientation. We also present a refined sidereal period of P (sid) = 5.234246 +/- 0.000097 hr. A search for surface color heterogeneity showed no significant rotational variation. An activity search using the deepest stacked image available of 2005 UD near aphelion did not reveal a coma or tail but allowed modeling of an upper limit of 0.04-0.37 kg s(-1) for dust production. We then leveraged our spin solutions to help limit the range of formation scenarios and the link to Phaethon in the context of nongravitational forces and timescales associated with the physical evolution of the system.
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