Alkali phenoxides in comets | Astronomy & Astrophysics (A&A)

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Table 1

Log of observations.

Comet	Time UT	r_h	Δ	dr_h/dt	dΔ/dt	Phase angle	Slit width	Slit length	Slit area	Exp. time	Air mass	Standard star
		au	au	km s⁻¹	km s⁻¹	deg	arcsec	arcsec	km²	s
C/2020 F3	2020 Jul. 10.1	0.36	0.93	+29	−57	94	2	17	1.5 × 10⁷	600	5	HR1558
C/2024 G3	2025 Jan. 15.7	0.15	0.96	+67	+40	94	3	17	2.5 × 10⁷	40 × 5	≈20

Notes. r_h and Δ are the heliocentric and geocentric distances, respectively. The slit was north-south oriented.

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