Searching for water ice in the coma of interstellar object 2I/Borisov

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Table 1.

Journal of the 2I observations.

UT Date	Facility	r_h^†	Δ^†	α^‡	χ^§	Standard
2019		[au]	[au]	[deg]
Sep 19	IRTF	2.67	3.26	15.78	1.95	HD 283886
Sep 24	Gemini	2.60	3.16	16.77	2.15	SAO 79667
Oct 09	IRTF	2.41	2.84	19.78	1.77	HD 87680

Notes.

^(†)

r_h and Δ are the heliocentric and geocentric distances, respectively;

^(‡)

α is the phase angle;

^(§)

χ is the airmass.

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