19500+4509 ES   23AB

Coord 2000	19500+4509		Discov num	ES   23		Comp	AB		Coord arcsec 2000	19 49 59.38 +45 09 05.4
Date first	1892		Date last	2015		Obs	15
Pa first	139		Pa last	136		P.A. Now (θ)	136°
Sep first	7.7		Sep last	8.6		Sep. Now (ρ)	8.6"
Mag pri	8.27		Mag sec	12.60		delta mag (ΔM)	4.33		Spectral class	K0 (yellow-orange)
Pri motion ra	-007		Sec motion ra	-006
Pri motion dec	-007		Sec motion dec	-010
Notes

rPM=0.271 (< 0.3, Physical double) This double is physical.

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		48880	19500+4509	ES 23	AB	1892	2015	15	136	8.6	8.27	12.60	4.33		<===
Show		48880	19500+4509	ES 23	AC	1915	2015	8	97	13.1	8.27	15.00	6.73
Show		48880	19500+4509	ES 23	AD	1892	2015	22	326	30.8	8.27	10.01	1.74

Quadruple system
4 visible stars in this system

Precise pa	136.3		Precise sep	8.567		Constellation	Cygnus		SAO	48880
HIP	97578		Tycho2	3557-00108-1		Gaia DR2	80758592256		HD	187810
BD	BD+44 3265		Distance	606.06		Distance ly	1976.97

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
19500+4509	ES 23	AB	2007	11	136	8.5	8.27	12.60	K0	D	194959.38+450905.4
19500+4509	ES 23	AB	2015	15	136	8.6	8.27	12.60	K0		194959.38+450905.4

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