19404+3121 SEI 657AB

Coord 2000	19404+3121		Discov num	SEI 657		Comp	AB		Coord arcsec 2000	19 40 21.57 +31 21 26.4
Date first	1893		Date last	2017		Obs	13
Pa first	357		Pa last	357		P.A. Now (θ)	357°
Sep first	19.2		Sep last	19.3		Sep. Now (ρ)	19.3"
Mag pri	8.91		Mag sec	11.01		delta mag (ΔM)	2.1		Spectral class	F8V (yellow-white)
Pri motion ra	-001		Sec motion ra	+001
Pri motion dec	-002		Sec motion dec	-001
Notes

rPM=1 This double is not physical.

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		68670	19404+3121	COU1163	Aa,Ab	1974	2007	6	165	0.1	9.50	9.50	0.00
Show		68670	19404+3121	SEI 657	AB	1893	2017	13	357	19.3	8.91	11.01	2.10		<===

Triple system
2 visible stars in this system

Precise pa	356.8		Precise sep	19.313		Constellation	Cygnus		SAO	68670
Tycho2	2656-04841-1		Gaia DR2	89388971904		HD	331099

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
19404+3121	SEI 657	AB	2002	6	357	19.2	8.91	11.01		D	194021.57+312126.4
19404+3121	SEI 657	AB	2017	8	357	19.3	8.91	11.01	F8V		194021.57+312126.4

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