NOAO >   Observing Info >   Approved Programs >   2017A-0307

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Program Information for 2017A-0307


PI: William Romanishin, U. of Oklahoma, wromanishin@ou.edu
Address: Physics Department, 440 W. Brooks St., Norman, OK 73019 USA

Title: Shapes of Hilda ``Asteroids" (continuation)

Abstract: NOTE: I was awarded 7 nights on this telescope for this project in November 2014 and had a partially successful run. I was also awarded 4 nights in January 2016, which was a pretty successful (but too short) run. The science requires observations over a period of about 3.5 years, or 3 successive oppositions of these objects. I will use optical CCD photometric lightcurve observations of Hilda ``asteroids" to study their shapes and estimate densities. Although the Hildas are called ``asteroids", recent work suggests that these objects may have formed far beyond Jupiter and then were captured into their present orbits at the stable 3:2 resonance of the Sun-Jupiter system. Thus, these objects may be closer in physical nature to icy comets than to rocky/ metallic asteroids. The scientific goal of the work proposed here is to derive reliable shapes and density estimates for a sample of $sim$ half a dozen Hildas to compare with data for Jovian Trojans, comets, main belt asteroids, Centaurs, and KBOs. Density estimate for the Hilda class of objects will help elucidate the origin of this group of objects and the ``big picture" of the history of minor bodies in the solar system.

Program Type: Standard/Solar System

Scheduled Nights:
Run 1 (2017A):  KP-0.9m/HDI -- 5n on Feb 16 - Feb 20 2017


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NOAO >   Observing Info >   Approved Programs >   2017A-0307

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