Observations of comet C/2020 F3 (NEOWISE) with IRAM telescopes

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Volume 668 (December 2022)

A&A, 668 (2022) A171

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Table 1

Log of observations with IRAM telescopes.

UT date		〈r_h〉 (au)	〈Δ〉 (au)	Phase	pwv^(a) (mm)	Integ. Time^(a) (min)	Freq. range (GHz)
(yyyy/mm	dd.dd–dd.dd)
IRAM 30-m

2020/05	23.63–23.70	1.090	1.622	37.8°	11–15	38	83.3–91.1,141.6–149.4
2020/07	25.59–25.61	0.687	0.701	94.1°	13	23	248.7–256.5,264.4–272.2
	25.66–25.70	0.689	0.702	93.9°	11–16	47	209.7–217.5,225.4–233.1
	25.75–25.79	0.691	0.702	93.7°	7.3	47	240.4–248.1, 256.0–263.8
2020/07	26.57–26.62	0.709	0.709	91.4°	12–20	56	209.7–217.5, 225.4–233.1
	26.68–26.74	0.711	0.710	91.2°	13	63	83.3–91.1, 141.6–149.4
	26.76–26.79	0.713	0.711	91.0°	12.7	39	146.9–154.7, 162.6–170.4
2020/07	27.63–27.64^(c)	0.732	0.721	88.7°	9	12	83.3–91.1, 141.6–149.4
	27.67–27.73	0.733	0.721	88.5°	9	53	209.7–217.5, 225.4–233.1
	27.74-27.79	0.735	0.722	88.3°	7.5	53	248.7–256.5, 264.4–272.2

NOEMA (10 antenna)

2020/07	22.23–22.45	0.615	0.692	101.9°	10	180	140.9–148.6, 156.4–164.1^(d)
2020/08	07.68–07.85	0.969	0.959	63.5°	10–4	130	209.4–217.1, 224.9–232.6^(d)

Notes. ^(a)Total integration time (ON+OFF), adding up each NOEMA antenna. ^(b)Mean precipitable water vapour in the atmosphere above the telescope. ^(c)First 1h30 lost due to strong wind. ^(d)The Polyfix high spectral resolution windows only covers 20–25% of the frequency domain of the tuning.

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