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Zwicky Transient Facility Observations of Trojan Asteroids: A Thousand Colors, Rotation Amplitudes, and Phase Functions

Schemel, Madeline and Brown, Michael E. (2020) Zwicky Transient Facility Observations of Trojan Asteroids: A Thousand Colors, Rotation Amplitudes, and Phase Functions. . (Submitted)

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We introduce a new method for analyzing sparse photometric data of asteroids and apply it to Zwicky Transient Facility observations of the Jupiter Trojan asteroids. The method relies on the creation of a likelihood model that includes the probability distribution of rotational brightness variations at an unknown rotation phase. The likelihood model is analyzed via a Markov Chain Monte Carlo to quantify the uncertainty in our parameter estimates. Using this method, we provide color, phase parameter, absolute magnitude and amplitude of rotation measurements for 1049 Jupiter Trojans. We find that phase parameter is correlated with color and the distribution of Trojan asteroid rotational amplitudes is indistinguishable from that of main-belt asteroids.

Item Type:Report or Paper (Discussion Paper)
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URLURL TypeDescription Paper
Brown, Michael E.0000-0002-8255-0545
Additional Information:We have benefited from insightful discussion with James Keane, Anna Simpson, Samantha Trumbo, and Elizabeth Bailey. We thank Stefano Mottola for sharing current photometry for comparison. We thank the two anonymous referees for a very thorough reading of this manuscript and for multiple excellent suggestions for clarifying the presentation. This analysis based on observations obtained with the Samuel Oschin 48-inch Telescope at the Palomar Observatory as part of the Zwicky Transient Facility project. ZTF is supported by the National Science Foundation under Grant No. AST-1440341 and a collaboration including Caltech, IPAC, the Weizmann Institute for Science, the Oskar Klein Center at Stockholm University, the University of Maryland, the University of Washington, Deutsches Elektronen-Synchrotron and Humboldt University, Los Alamos National Laboratories, the TANGO Consortium of Taiwan, the University of Wisconsin at Milwaukee, and Lawrence Berkeley National Laboratories. Operations are conducted by COO, IPAC, and UW.
Group:Zwicky Transient Facility, Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
ZTF partner institutionsUNSPECIFIED
Record Number:CaltechAUTHORS:20201104-092555261
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:106423
Deposited By: Joy Painter
Deposited On:04 Nov 2020 17:44
Last Modified:04 Nov 2020 17:44

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