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

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Table A.1

OH, CN, C₂, C₃, and NH production rates of comet C/2021 A1 from the TRAPPIST-South monitoring.

UT Date	JD-2450000 midpoint	ΔT (days)	r_{h (au)}	Δ (au)	Production rates (molecules/s)
					Q(OH)	Q(CN)	Q(C2)	Q(C3)	Q(NH)
2021-12-19	9567.53	−15	0.70	0.35	(6.60±2.30)E28	(2.04±0.22)E26	(2.21±0.14)E26	(2.00±0.47)E25	(5.79±1.12)E26
2021-12-21^*	9569.54	−13	0.68	0.42	(9.73±2.24)E28	(3.60±0.30)E26	(3.53±0.17)E26	(3.52±0.68)E25	(1.11±0.14)E27
2021-12-22	9570.54	−12	0.67	0.46	(3.46±0.69)E28	(1.60±0.14)E26	(1.50±0.06)E26	(1.43±0.24)E25	(5.11±0.55)E26
2021-12-23	9571.54	−11	0.66	0.49	(1.89±0.35)E28	(1.04±0.06)E26	(1.05±0.03)E26	(1.22±0.14)E25	(2.41±0.29)E26
2021-12-25^*	9573.55	−9	0.65	0.57	(9.35±1.59)E28	(3.55±0.22)E26	(3.17±0.10)E26	(2.94±0.45)E25	(1.22±0.11)E27
2021-12-26	9574.58	−8	0.64	0.61		(2.40±0.18)E26	(2.77±0.10)E26	(3.55±0.41)E25
2021-12-29	9577.55	−5	0.63	0.72		(1.57±0.09)E26	(1.15±0.03)E26	(1.24±0.17)E25	(5.35±0.43)E26
2021-12-30^*	9578.55	−4	0.62	0.76		(7.17±0.38)E26	(7.26±0.19)E26	(1.33±0.08)E26	(1.95±0.16)E27
2021-12-31	9579.55	−3	0.62	0.80	(9.33±1.53)E28	(3.85±0.23)E26	(3.32±0.10)E26	(5.17±0.38)E25	(1.15±0.10)E27
2022-01-01	9580.55	−2	0.62	0.83	(1.18±0.19)E29	(4.63±0.27)E26	(4.75±0.14)E26	(7.65±0.64)E25	(1.47±0.15)E27
2022-01-02^*	9581.55	−1	0.62	0.87	(1.56±0.26)E29	(5.60±0.33)E26	(5.39±0.16)E26	(7.76±0.61)E25	(1.84±0.17)E27
2022-01-03	9582.55	0	0.61	0.91	(1.06±0.18)E29	(3.80±0.24)E26	(3.40±0.11)E26	(4.25±0.44)E25	(1.27±0.15)E27
2022-01-04	9583.54	1	0.61	0.94	(6.09±1.05)E28	(2.62±0.13)E26	(2.29±0.06)E26	(3.37±0.24)E25	(8.04±0.70)E26
2022-01-05	9584.54	2	0.62	0.98	(3.25±0.60)E28	(1.43±0.08)E26	(1.03±0.04)E26	(1.06±0.15)E25	(4.85±0.49)E26
2022-01-06	9585.54	3	0.62	1.02	(1.93±0.36)E28	(8.34±0.43)E25	(5.25±0.19)E25	(4.00±0.74)E24	(3.06±0.30)E26
2022-01-07	9586.54	4	0.62	1.05	(1.65±0.30)E28	(7.23±0.35)E25	(6.23±0.17)E25	(8.71±0.98)E24	(2.63±0.25)E26
2022-01-08^*	9587.54	5	0.62	1.09	(5.00±0.97)E28	(2.31±0.13)E26	(2.83±0.08)E26	(5.63±0.41)E25	(7.03±0.70)E26
2022-01-09	9588.54	6	0.63	1.12	(9.45±1.87)E28	(3.43±0.19)E26	(3.21±0.10)E26	(3.63±0.43)E25	(1.06±0.11)E27
2022-01-12^*	9591.53	9	0.64	1.22	(6.45±1.31)E28	(2.82±0.15)E26	(3.90±0.10)E26	(5.09±0.33)E25	(7.93±0.77)E26
2022-01-13	9592.53	10	0.65	1.25	(2.80±0.60)E28	(1.04±0.06)E26	(1.19±0.04)E26	(9.64±1.36)E24	(3.33±0.39)E26
2022-01-17	9596.53	14	0.68	1.37	(2.13±0.53)E28	(8.58±0.59)E25	(9.14±0.37)E25	(1.09±0.17)E25	(2.66±0.38)E26
2022-01-18	9597.54	15	0.69	1.40	(4.38±1.21)E28	(1.47±0.11)E26	(1.79±0.07)E26	(1.86±0.21)E25
2022-01-19	9598.54	16	0.70	1.43	(3.77±1.13)E28	(1.22±0.12)E26	(1.30±0.05)E26	(1.28±0.25)E25	(4.06±0.53)E26
2022-01-20	9599.53	17	0.71	1.45	(2.46±0.78)E28	(7.27±0.61)E25	(1.06±0.05)E26	(1.16±0.15)E25	(2.22±0.33)E26
2022-01-21	9600.53	18	0.72	1.48	(4.70±1.58)E28	(1.15±0.10)E26	(1.40±0.07)E26	(1.31±0.22)E25	(4.26±0.63)E26
2022-01-22	9601.53	19	0.74	1.50	(2.77±1.00)E28	(6.57±0.70)E25	(7.33±0.51)E25	(6.55±2.10)E24	(2.56±0.44)E26
2022-01-23	9602.53	20	0.75	1.53	(5.25±1.99)E28	(1.38±0.12)E26	(1.80±0.09)E26	(2.33±0.32)E25	(4.44±0.78)E26
2022-01-26	9605.53	23	0.78	1.60	(2.00±2.16)E28	(6.89±0.81)E25	(7.97±0.66)E25	(6.16±2.57)E24

Notes. ΔT is the time to perihelion, with negative values indicating pre-perihelion passage, r_h is the heliocentric distance of the comet, and A is the geocentric distance of the comet. Dates when a new outburst was detected are indicated with “*”.

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