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20137+4050
DOO 13

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

20137+4050 DOO 13

20^h 13^m 44.60^s +40° 50' 19.2" P.A. 258.00 sep 3.0 mag 9.94,10.39 Sp B2I: dist. 4166.67 pc (13591.68 l.y.)

Coord 2000	20137+4050		Discov num	DOO 13		Comp			Coord arcsec 2000	20 13 44.60 +40 50 19.2
Date first	1900		Date last	2018		Obs	24
Pa first	258		Pa last	258		P.A. Now (θ)	258°
Sep first	2.8		Sep last	3.0		Sep. Now (ρ)	3"
Mag pri	9.94		Mag sec	10.39		delta mag (ΔM)	0.45		Spectral class	B2I: (blue-white)
Pri motion ra	-002		Sec motion ra	-003
Pri motion dec	-006		Sec motion dec	-006
Notes	N (See Notes)

rPM=0.149 (< 0.3, Physical double)

This double is physical.

OTHER CATALOGS AND DESIGNATIONS

Precise pa	258.2		Precise sep	3.021		Constellation	Cygnus		HIP	99688
Tycho2	3155-01471-1		Gaia DR2	2062582044472384512		HD	228446		BD	BD+40 4068
Distance	4166.67		Distance ly	13591.68

WDS HISTORIC DATA

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20137+4050	DOO 13		2001	20	258	3.0	9.94	10.39		D	201344.60+405019.2
20137+4050	DOO 13		2009	21	258	2.9	9.94	10.39		D	201344.60+405019.2
20137+4050	DOO 13		2015	23	258	2.9	9.94	10.39	B2I:	N	201344.60+405019.2
20137+4050	DOO 13		2018	24	258	3.0	9.94	10.39	B2I:	N	201344.60+405019.2

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