IRTF Data Archive Program Information

# # Program information file # PROGRAM_ID 2023B985 PROGRAM_TITLE Time Series Photometry of the Centaur Chiron PROGRAM_INV1 Bryan Holler PROGRAM_INV2 PROGRAM_INV3 PROGRAM_INV4 PROGRAM_INV5 PROGRAM_SCICAT Centaurs / TNOs / KBOs PROGRAM_ABSTRACT_BEG Moris and Opihi time-series imaging observations of the solar system small body Chiron, a Centaur with previous indication of rings and activity. A multi-chord occultation by Chiron was successfully observed September 10th (UT) and time-series imaging close in time to the event is required to construct the rotation light curve and determine the rotation phase at the time of the occultation. The rotation phase determines the projected area of the target on the sky and thereby constrains the 3D shape of the object; such information has also previously been used to identify topographic features on the TNOs 2003 AZ84 and 2002 MS4. Without the context of the rotation phase and projected area, ambiguities in the size and 3D shape of Chiron will persist. PROGRAM_ABSTRACT_END