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20188+3924
SEI1078

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

20188+3924 SEI1078

20^h 18^m 45.15^s +39° 24' 22.4" P.A. 45.00 sep 17.7 mag 9.32,11.32 Sp B1V

Coord 2000	20188+3924		Discov num	SEI1078		Comp			Coord arcsec 2000	20 18 45.15 +39 24 22.4
Date first	1892		Date last	2015		Obs	12
Pa first	45		Pa last	45		P.A. Now (θ)	45°
Sep first	18.1		Sep last	17.7		Sep. Now (ρ)	17.7"
Mag pri	9.32		Mag sec	11.32		delta mag (ΔM)	2		Spectral class	B1V (blue-white)
Pri motion ra	-005		Sec motion ra	-004
Pri motion dec	-005		Sec motion dec	-005
Notes

rPM=0.141 (< 0.3, Physical double)

This double is physical.

OTHER CATALOGS AND DESIGNATIONS

Precise pa	44.5		Precise sep	17.691		Constellation	Cygnus		SAO	69813
Tycho2	3155-00329-1		Gaia DR2	2061472499799425664		HD	193427

WDS HISTORIC DATA

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20188+3924	SEI1078		2000	5	44	17.8	9.31	11.30	B1V	D	201845.15+392422.4
20188+3924	SEI1078		2002	6	44	17.7	9.31	11.30	B1V	D	201845.15+392422.4
20188+3924	SEI1078		2010	7	45	17.7	9.32	11.32	B1V		201845.15+392422.4
20188+3924	SEI1078		2015	8	45	17.7	9.32	11.32	B1V		201845.15+392422.4

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