S21B0081
S21B0081
Volatile composition on surfaces of trans-Neptunian objects (TNOs) is crucial to study their thermal/chemical evolution and geological activity. Though large TNOs have icy surfaces, none or only small amounts of H2O ice have been detected on most objects smaller than ∼800 km in diameter. Detailed examination of this transition of H2O ice abundance with TNO size is required for understanding the surface phenomena on icy bodies such as cryovolcanism. We propose a near-infrared photometric observation for mid-size TNOs using SWIMS and the medium-band filter to measure the intensity of the 2.0-µm absorption of H2O ice much more precisely and efficiently than spectroscopy. This observation allows us to investigate the relationships between surface H2O ice abundance on TNOs and some potentially related parameters.
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