19551+3012 STT 390AB

Coord 2000	19551+3012		Discov num	STT 390		Comp	AB		Coord arcsec 2000	19 55 06.50 +30 11 41.6
Date first	1849		Date last	2013		Obs	31
Pa first	23		Pa last	22		P.A. Now (θ)	22°
Sep first	9.6		Sep last	9.9		Sep. Now (ρ)	9.9"
Mag pri	6.63		Mag sec	9.50		delta mag (ΔM)	2.87		Spectral class	B6V+A5V (blue-white/white)
Pri motion ra	+005		Sec motion ra	+005
Pri motion dec	+001		Sec motion dec	+001
Notes

Nature of this double is uncertain.

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		69079	19551+3012	STT 390	AB	1849	2013	31	22	9.9	6.63	9.50	2.87		<===
Show		69079	19551+3012	STT 390	AC	1849	2013	15	177	16.4	6.63	11.23	4.60
Show		69079	19551+3012	WAL 121	AD	1944	2013	3	145	55.3	6.63	12.21	5.58

Quadruple system
4 visible stars in this system

Precise pa	22.3		Precise sep	9.89		Constellation	Cygnus		SAO	69079
HIP	98017		Tycho2	2669-05015-1		HD	188651		HR	7607
BD	BD+29 3802		Distance	262.47		Distance ly	856.18		last precise pa	22.3
last precise sep	9.89

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
19551+3012	STT 390	AB	2008	25	23	9.6	6.63	9.50	B6V+A5V	D	195506.50+301141.6
19551+3012	STT 390	AB	2012	28	22	9.6	6.63	9.50	B6V A5V	D	195506.50+301141.6
19551+3012	STT 390	AB	2013	30	25	9.0	6.63	9.50	B6V A5V	D	195506.50+301141.6

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