The chemical composition of CO-rich comet C/2023 H2 (Lemmon)

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Table 1

CRIRES⁺ observation log for C/2023 H2.

UT time dd.mm.yy	R_h (au)	∆ (au)	$\dot{Δ}$ ${\rm{\dot \Delta }}$ (km s⁻¹)	Setting	Execution time hh:min	Time on source min	Airmass
24.11.23	1.01	0.51	56.6	L3302	01:00–01:55	48	1.34
25.11.23	1.02	0.54	56.9	L3377	00:17–01:10	48	1.19
26.11.23	1.02	0.57	57.1	M4318	00:05–01:00	40	1.16
27.11.23	1.03	0.60	57.2	L3302	01:02–01:52	48	1.36

Notes. R_h is the heliocentric distance; and ∆ and $\dot{Δ}$ ${\rm{\dot \Delta }}$ are the geocentric distance and geocentric velocity, respectively. The total execution and integration times are given as a start-stop range. The integration time on source is also given, as well as the averaged airmass during the comet observations.

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