IRTF Data Archive Program Information

# # Program information file # PROGRAM_ID 2021A086 PROGRAM_TITLE A search for spectral heterogeneity on Trojan asteroids PROGRAM_INV1 Joshua Emery PROGRAM_INV2 Audrey Martin PROGRAM_INV3 Joey Chatelain PROGRAM_INV4 Keith Noll PROGRAM_INV5 David Trilling PROGRAM_SCICAT solar system PROGRAM_ABSTRACT_BEG We propose rotationally-resolved near-infrared [0.8 - 2.5 micron] spectral observations of the Trojan asteroid 4709 Ennomos. 4709 Ennomos has an anomalously high albedo, and spectra taken over several years show significant variability. We aim to characterize the spectral changes in terms of spectral slope and shape and to search for absorption features that may provide insight into the interior composition. We will obtain simultaneous NIR spectra and visible lightcurve, to better characterize the spectral variations and map them to rotational phase. The specific absorptions we will search for are those due to ices, organics, and/or silicates. 4709 Ennomos may be the best candidate among the Trojan asteroids to reveal the source of compositional variability in this population. PROGRAM_ABSTRACT_END