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20231+4037
TDT2228

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Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

20231+4037 TDT2228

20^h 23^m 04.98^s +40° 36' 36.0" P.A. 242.00 sep 0.4 mag 9.41,10.39 Sp B9

Coord 2000	20231+4037		Discov num	TDT2228		Comp			Coord arcsec 2000	20 23 04.98 +40 36 36.0
Date first	1991		Date last	2011		Obs	2
Pa first	251		Pa last	242		P.A. Now (θ)	242°
Sep first	0.4		Sep last	0.4		Sep. Now (ρ)	0.4"
Mag pri	9.41		Mag sec	10.39		delta mag (ΔM)	0.98		Spectral class	B9 (blue-white)
Pri motion ra	+003		Sec motion ra	+003
Pri motion dec	-003		Sec motion dec	-003
Notes

Nature of this double is uncertain.

OTHER CATALOGS AND DESIGNATIONS

Precise pa	241.7		Precise sep	0.38		Constellation	Cygnus		SAO	49554
Tycho2	3156-00936-1		Gaia DR2	2067559567962683648		HD	229177

WDS HISTORIC DATA

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20231+4037	TDT2228		1991	1	251	0.4	9.41	10.39			202304.98+403636.0
20231+4037	TDT2228		2011	2	242	0.4	9.41	10.39	B9		202304.98+403636.0

If you need more information about this double, apply for a data request form to the WDS.