IRTF Data Archive Program Information

# # Program information file # PROGRAM_ID 2021B112 PROGRAM_TITLE Understanding Space Weathering and Composition in the Koronis Asteroid Family PROGRAM_INV1 Cristina Thomas PROGRAM_INV2 Andrew Rivkin PROGRAM_INV3 David Trilling PROGRAM_INV4 PROGRAM_INV5 PROGRAM_SCICAT solar system PROGRAM_ABSTRACT_BEG We propose to obtain near-infrared [0.7-2.5-micron] SpeX spectra of 8-10 small [D~2-4~km] Koronis family members to identify 'fresh' Q-type objects, investigate space weathering effects, and determine composition. The Koronis family is one of the best studied families in the Main Belt, which makes it an excellent candidate for additional in-depth spectral investigations. The old S-type family has been shown to have an ordinary chondrite-like composition and display changes in spectral slope associated with space weathering. All potential targets have spectrophotometric slopes and shapes similar to those of Q-type asteroids. If confirmed, these objects would be the first Q-types discovered in an old Main Belt asteroid family and would change our understanding of the presence and distribution of Q-type material in the Main Belt. We will propose to complete this effort in 3 semesters [2021B-2022B]. Our past work has indicated that SNR~50 is sufficient for accurate taxonomic classification and SNR~100 is required to ensure minimal errors on the band parameters in our compositional analysis. Due to the faintness of our targets, we only request time for one object to be observed at SNR~100. We request a total of 13.2 hours [~ 1.3 nights] for 2021B. PROGRAM_ABSTRACT_END