Low NH3/H2O ratio in comet C/2020 F3 (NEOWISE) at 0.7 au from the Sun

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Table B.2

Abundances of ammonia in comets from in situ measurements.

UT date (yyyy/mm/dd.d)	r_h (au)	Instrument	(%)^b	Come^a Type	Name	Reference
1986 03 14	0.90	Giotto/NMS^c	1.5 + 0.6	HTC	1P/Halley	Meier et al. (1994); Rubin et al. (2011)
2015 08 15.0	1.25 (pre-perihelion)	Rosetta/MIRO	0.40 + 0.03	JFC	67P/C-G	Biver et al. (2019)
2015 11 22.2	1.72 (post-perihelion)	Rosetta/MIRO	0.15 + 0.05	JFC	67P/C-G	idem

	3.2	Rosetta/ROSINA	0.06^{N summer} −0.15^{S winter}	JFC	67P/C-G	Le Roy et al. (2015)
	(pre-perihelion, pre-in-equinox)	Rosetta/MIRO	0.2	JFC	67P/C-G	Biver et al. (2019)

	2.0 – 2.7	Rosetta/ROSINA	0.0378 + 0.0013	JFC	67P/C-G	Gasc et al. (2017)
	(post-perihelion, pre-out-equinox)	Rosetta/MIRO	0.1	JFC	67P/C-G	Biver et al. (2019)

	3.1–3.5	Rosetta/ROSINA	0.0132 + 0.0013	JFC	67P/C-G	Gasc et al. (2017)
	(post-perihelion, post-out-equinox)

	Bulk (May 2015)	Rosetta/ROSINA	0.67 +0.20^{S summer}	JFC	67P/C-G	Rubin et al. (2019)
	(pre-perihelion, post-in-equinox)

	2-year integrated	Rosetta/ROSINA	(0.34 ± 0.11)^S −(0.43 ±0.13)^N	JFC	67P/C-G	Läuter et al. (2022)
		Rosetta/MIRO	0.34 ± 0.01	JFC	67P/C-G

Notes. ^(a) HTC = Halley-Type Cornet, JFC = Jupiter-Family Cornet, 67P/C-G = 67P/Churyumov-Gerasimenko. ^(b) N and S denote the northern and southern hemispheres of 67P/Churyumov-Gerasimenko, respectively.^(c) NMS = Neutral Mass Spectrometer.

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