19539+3906 SEI 718

Coord 2000	19539+3906		Discov num	SEI 718		Comp			Coord arcsec 2000	19 53 51.79 +39 06 25.8
Date first	1896		Date last	2015		Obs	11
Pa first	351		Pa last	354		P.A. Now (θ)	354°
Sep first	15.3		Sep last	15.9		Sep. Now (ρ)	15.9"
Mag pri	8.04		Mag sec	11.70		delta mag (ΔM)	3.66		Spectral class	B9 (blue-white)
Pri motion ra	+002		Sec motion ra	+004
Pri motion dec	-002		Sec motion dec	+003
Notes

rPM=1.077 This double is not physical.

Precise pa	353.9		Precise sep	15.861		Constellation	Cygnus		SAO	69045
HIP	97913		Tycho2	3137-00479-1		Gaia DR2	76377860096		HD	188501
BD	BD+38 3809		Distance	729.93		Distance ly	2381.03

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
19539+3906	SEI 718		1998	4	354	15.8	8.20	11.70	B9	D	195351.79+390625.8
19539+3906	SEI 718		2002	5	354	16.0	8.20	11.70	B9	D	195351.79+390625.8
19539+3906	SEI 718		2010	6	354	15.2	8.04	11.70	B9		195351.79+390625.8
19539+3906	SEI 718		2015	7	354	15.9	8.04	11.70	B9		195351.79+390625.8

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