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Doubles in session

Current system

20121+3938
SEI 997

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

20121+3938 SEI 997

20^h 12^m 03.92^s +39° 37' 42.2" P.A. 146.00 sep 10.3 mag 11.20,11.50

Coord 2000	20121+3938		Discov num	SEI 997		Comp			Coord arcsec 2000	20 12 03.92 +39 37 42.2
Date first	1892		Date last	2015		Obs	12
Pa first	148		Pa last	146		P.A. Now (θ)	146°
Sep first	10.4		Sep last	10.3		Sep. Now (ρ)	10.3"
Mag pri	11.20		Mag sec	11.50		delta mag (ΔM)	0.3		Spectral class
Pri motion ra	-002		Sec motion ra	-002
Pri motion dec	-002		Sec motion dec	-003
Notes

rPM=0.277 (< 0.3, Physical double)

This double is physical.

OTHER CATALOGS AND DESIGNATIONS

Precise pa

146.4

Precise sep

10.348

Constellation

Cygnus

Gaia DR2

2062372140832179968

WDS HISTORIC DATA

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20121+3938	SEI 997		1998	4	146	10.4	11.20	11.50		D	201203.92+393742.2
20121+3938	SEI 997		2006	5	146	10.3	11.20	11.50		D	201203.92+393742.2
20121+3938	SEI 997		2011	7	147	10.3	11.20	11.50		D	201203.92+393742.2
20121+3938	SEI 997		2015	8	146	10.3	11.20	11.50			201203.92+393742.2

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