19307+2758 RBR 12 Ba,Bb

Coord 2000	19307+2758		Discov num	RBR  12		Comp	Ba,Bb		Coord arcsec 2000	19 30 45.40 +27 57 55.0
Date first	-1		Date last	-1		Obs	0
Pa first	-1		Pa last	-1		P.A. Now (θ)	-1
Sep first	-1.0		Sep last	-1		Sep. Now (ρ)	-1
Mag pri	5.10		Mag sec	9.20		delta mag (ΔM)	4.1		Spectral class	B8V+G4V (blue-white/yellow)
Pri motion ra	-002		Sec motion ra
Pri motion dec	-001		Sec motion dec
Notes	N X (See Notes, Dubious double)

Nature of this double is uncertain.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		87301	19 30 43 +27 57 35	BNU 10 Aa,Ab	1995	2	160	0.0	3.37	5.00	1.63
Show		87301	19 30 43 +27 57 35	MCA 55 Aa,Ac	2022	64	40	0.3	3.37	5.16	1.79	Y
Show	Albireo	87301	19 30 43 +27 57 35	STFA 43 AB	2022	292	54	34.6	3.19	4.68	1.49
Show		87301	19 30 43 +27 57 35	WAL 114 AC	2022	12	341	65.2	3.19	10.99	7.80
Show		87301	19 30 43 +27 57 35	CTT 17 AD	2022	12	32	108.2	3.19	12.24	9.05
Show		87301	19 30 43 +27 57 35	CTT 18 AE	2022	12	206	75.3	3.19	11.81	8.62
Show		87301	19 30 43 +27 57 35	SMR 34 AF	2022	8	45	59.1	3.19	12.00	8.81
Show		87301	19 30 43 +27 57 35	SMR 34 AG	2022	7	45	162.8	3.19	12.50	9.31
Show		87301	19 30 43 +27 57 35	SMR 34 AH	2022	8	117	54.5	3.19	12.50	9.31
Show		87301	19 30 43 +27 57 35	SMR 34 AI	2022	7	131	37.5	3.19	12.50	9.31
Show		87301	19 30 43 +27 57 35	SMR 34 AJ	2022	6	132	146.3	3.19	10.00	6.81
Show		87301	19 30 43 +27 57 35	SMR 34 AK	2022	7	277	141.9	3.19	11.50	8.31
Show		87301	19 30 43 +27 57 35	SMR 34 AL	2012	1	269	12.0	3.19	11.50	8.31
Show		87302	19 30 45 +27 57 55	RBR 12 Ba,Bb	-1	0	-1	-1.0	5.10	9.20	4.10		<===

15-fold system
12 estimated visually detectable stars in this system

Constellation	Cygnus		SAO	87302		HIP	95951		Tycho2	2133-02963-1
Gaia DR2	2026113339752723456		HD	183914		HR	7418		GC	26956
ADS	12540		BD	BD+27 3411		Bayer	Beta 2 Cygni		Bayer name	Bet2 Cyg
Distance	122.55		Distance ly	399.76		Bayer greek	β2 Cyg