20120+3454 SEI 987

Coord 2000	20120+3454		Discov num	SEI 987		Comp			Coord arcsec 2000	20 12 01.45 +34 54 05.1
Date first	1896		Date last	2015		Obs	12
Pa first	336		Pa last	336		P.A. Now (θ)	336°
Sep first	23.7		Sep last	23.2		Sep. Now (ρ)	23.2"
Mag pri	11.40		Mag sec	12.26		delta mag (ΔM)	0.86		Spectral class	A2 (white)
Pri motion ra	+000		Sec motion ra	+001
Pri motion dec	-002		Sec motion dec	-002
Notes

rPM=0.447 Nature of this double is uncertain.

Precise pa	336.1		Precise sep	23.235		Constellation	Cygnus		SAO	69595
Tycho2	2679-02013-1		Gaia DR2	12613118208

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20120+3454	SEI 987		1998	4	336	23.3	11.40	12.40		D	201201.45+345405.1
20120+3454	SEI 987		2002	5	336	23.3	11.40	12.40		D	201201.45+345405.1
20120+3454	SEI 987		2011	6	336	23.2	11.40	12.40		D	201201.45+345405.1
20120+3454	SEI 987		2015	8	336	23.2	11.40	12.26	A2		201201.45+345405.1

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