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Doubles in session

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20305+3540
SEI1142

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

20305+3540 SEI1142

20^h 30^m 28.65^s +35° 39' 54.4" P.A. 78.00 sep 21.7 mag 10.43,9.69

Coord 2000	20305+3540		Discov num	SEI1142		Comp			Coord arcsec 2000	20 30 28.65 +35 39 54.4
Date first	1896		Date last	2015		Obs	15
Pa first	77		Pa last	78		P.A. Now (θ)	78°
Sep first	22.2		Sep last	21.7		Sep. Now (ρ)	21.7"
Mag pri	10.43		Mag sec	9.69		delta mag (ΔM)	0.74		Spectral class
Pri motion ra	+002		Sec motion ra	+001
Pri motion dec	-004		Sec motion dec	-010
Notes

rPM=0.605

Nature of this double is uncertain.

OTHER CATALOGS AND DESIGNATIONS

Precise pa	78		Precise sep	21.653		Constellation	Cygnus		Tycho2	2697-01376-1
Gaia DR2	2056781605234000256

WDS HISTORIC DATA

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20305+3540	SEI1142		2005	8	78	21.7	10.43	9.69		D	203028.65+353954.4
20305+3540	SEI1142		2010	10	78	21.5	10.43	9.69			203028.65+353954.4
20305+3540	SEI1142		2015	11	78	21.6	10.43	9.69			203028.65+353954.4

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