Sublimation-Driven Activity in Main-Belt Comet 313P/Gibbs

We present an observational and dynamical study of newly discovered main-belt comet 313P/Gibbs. We find that the object is clearly active both in observations obtained in 2014 and in precovery observations obtained in 2003 by the Sloan Digital Sky Survey, strongly suggesting that its activity is sub...

Full description

Saved in:
Bibliographic Details
Published in:arXiv.org 2015-01
Main Authors: Hsieh, Henry H, Hainaut, Olivier, Novakovic, Bojan, Bolin, Bryce, Denneau, Larry, Fitzsimmons, Alan, Haghighipour, Nader, Kleyna, Jan, Kokotanekova, Rosita, Lacerda, Pedro, Meech, Karen J, Micheli, Marco, Moskovitz, Nick, Schunova, Eva, Snodgrass, Colin, Wainscoat, Richard J, Wasserman, Lawrence, Waszczak, Adam
Format: Article
Language:English
Subjects:
Comet nuclei
Dust
Emission
Jupiter
Photometry
Reflecting telescopes
Saturn
Sky surveys (astronomy)
Sublimation
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We present an observational and dynamical study of newly discovered main-belt comet 313P/Gibbs. We find that the object is clearly active both in observations obtained in 2014 and in precovery observations obtained in 2003 by the Sloan Digital Sky Survey, strongly suggesting that its activity is sublimation-driven. This conclusion is supported by a photometric analysis showing an increase in the total brightness of the comet over the 2014 observing period, and dust modeling results showing that the dust emission persists over at least three months during both active periods, where we find start dates for emission no later than 2003 July 24+/-10 for the 2003 active period and 2014 July 28+/-10 for the 2014 active period. From serendipitous observations by the Subaru Telescope in 2004 when the object was apparently inactive, we estimate that the nucleus has an absolute R-band magnitude of H_R=17.1+/-0.3, corresponding to an effective nucleus radius of r_e~1.00+/-0.15 km. The object's faintness at that time means we cannot rule out the presence of activity, and so this computed radius should be considered an upper limit. We find that 313P's orbit is intrinsically chaotic, having a Lyapunov time of T_l=12000 yr and being located near two 3-body mean-motion resonances with Jupiter and Saturn, 11J-1S-5A and 10J+12S-7A, yet appears stable over >50 Myr in an apparent example of stable chaos. We furthermore find that 313P is the second main-belt comet, after P/2012 T1 (PANSTARRS), to belong to the ~155 Myr old Lixiaohua asteroid family.
ISSN:2331-8422
DOI:10.48550/arxiv.1501.03873