NOAO >   Observing Info >   Approved Programs >   2015A-0221

Program Information for 2015A-0221

PI: Cristina A Thomas, NASA Goddard Space Flight Center, cristina.thomas@nau.edu
Address: Code 691, 8800 Greenbelt Rd., Greenbelt, MD 20771 USA

CoI: Lucy F Lim, NASA Goddard Space Flight Center
CoI: Joshua P Emery, U. of Tennessee
CoI: Keith S Noll, NASA Goddard Space Flight Center
CoI: Andrew Rivkin, Johns Hopkins U.
CoI: Michael E. Brown, California Institute of Technology

Title: Visible Spectroscopy of Jupiter's Trojan Asteroids

Abstract: The Trojan asteroids are a significant population of primitive bodies trapped in Jupiter's stable L4 and L5 Lagrange regions. Their physical properties and existence in these particular orbits constrain the chemical and dynamical processes in our early Solar System. The compositions of these objects are not well understood. Observations in visible and near-infrared wavelengths show no diagnostic spectral features. Based on visible and near-infrared spectra the Trojans can be separated into two distinct groups based on their spectral slopes: less red" and red". Spectral and photometric observations suggest that there are features at wavelengths shorter than 0.43 $\mu$m (the short wavelength end of most spectral observations of the Trojans) for the less red" objects. We propose to obtain visible spectroscopy in the $\sim$0.3-0.6 $\mu$m region using the R-C Spectrograph on the KPNO 4m of objects in the two spectral groups. We will search for additional spectral features that are diagnostic of composition. Any additional compositional information can enable identification of source regions, which will provide a valuable test between two models of Solar System evolution.

Program Type: Standard/Solar System

Scheduled Nights:
Run 1 (2015A):  KP-4m/RCSP -- 2n on Feb 18 - Feb 19 2015

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 >   2015A-0221