The volatile composition of C/2021 A1 (Leonard): Comparison between infrared and UV-optical measurements

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Table 1

CRIRES⁺ observation log for C/2021 A1.

UT time dd.mm.yy	Rh [au]	Δ [au]	[kms⁻¹]	Execution time hh:mm	Exposure time hh:mm	Time on source min	Airmass
29.12.2021	0.630	0.681	66.408	00:09–00:53	00:27–00:51	12	2.362
01.01.2022	0.620	0.794	65.923	00:09–01:02	00:29–01:02	15	2.504
03.01.2022	0.615	0.907	64.409	00:18–00:57	00:42–00:57	7	2.659

Notes. R_h is the heliocentric distance; Δ and are the geocentric distance and geocentric velocity, respectively. Total execution and integration times are given as a start-stop range. The real integration time on source is also given, as well as the averaged airmass during the comet observations.

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