NOAO >   Observing Info >   Approved Programs >   2018A-0146

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Program Information for 2018A-0146


PI: Sarah Sonnett, PSI, ssonnett@psi.edu
Address: 1700 E Fort Lowell Road, Suite 106, Tucson, AZ 85719 USA

CoI: Tommy Grav, PSI

Title: Investigating Solar System History through Binary Trojan and Hilda Asteroids

Abstract: Different solar system evolution models predict different formation locations for Jovian Trojan (hereafter, Trojan) and Hilda asteroids. Therefore, knowing Trojan and Hilda formation location(s) offers powerful constraints on these benchmark solar system formation models. Asteroid formation location can be determined through density; those with outer solar system origins are less dense than those that formed in the inner solar system due to higher ice fractions. Density can only practically be determined by characterizing binary systems, only 5 of which are known in both Trojans and Hildas. We identified 77 Trojan and Hilda binary candidates and are conducting a follow-up campaign to densely sample their rotational light curves in order to confirm and characterize binarity. We propose to follow-up 6 of our brighter targets visible during the 2018A semester. We will then fit shape models to determine density, building the first statistically significant distribution of Trojan and Hilda densities, then statistically compare density distributions to assess formation location. This work will help provide context for the upcoming Lucy Mission to 6 Trojans, including 1 binary system.

Program Type: Standard/Solar System

Scheduled Nights:
Run 1 (2018A):  KP-0.9m/HDI -- 5n on Feb 15 - Feb 19 2018


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2018A-0146

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