IRTF Data Archive Program Information

# # Program information file # PROGRAM_ID 2021A081 PROGRAM_TITLE Occasional Triton spectra 2020-2023 for rotational and seasonal variability PROGRAM_INV1 Leslie Young PROGRAM_INV2 William Grundy PROGRAM_INV3 Bryan Holler PROGRAM_INV4 Eliot Young PROGRAM_INV5 Glenn Orton PROGRAM_SCICAT solar system PROGRAM_ABSTRACT_BEG includes baseline campaigns that sample Triton's rotational variation approximately every five years with occasional runs in the intervening semesters. This proposal is for occasional runs, since we just completed a successful baseline run in 2019B. We will soon see the end of Triton's southern summer, with sub-solar latitudes ranging from -37 deg in July 2020 to -32 deg in Nov 2023. Continued spectra can be used to [i] detect transient anomolies, if any, [ii] decouple migration from viewing geometry, and [iii] search for new ices at newly exposed latitudes. The observation strategy will closely mirror that of Grundy and Young 2004 [Icarus 172, 455-465], Grundy et al. 2010 [Icarus 205, 594-604], and Holler et al. 2016 [Icarus 267, 255-266]. In 2019B, we began saving serendipitous Neptune cloud imaging, and we now add Glenn Orton to the program. PROGRAM_ABSTRACT_END