20105+2920 BRT  46AB

Coord 2000	20105+2920		Discov num	BRT  46		Comp	AB		Coord arcsec 2000	20 10 28.74 +29 20 04.8
Date first	1893		Date last	2015		Obs	19
Pa first	78		Pa last	79		P.A. Now (θ)	79°
Sep first	4.3		Sep last	5.3		Sep. Now (ρ)	5.3"
Mag pri	11.24		Mag sec	11.80		delta mag (ΔM)	0.56		Spectral class
Pri motion ra	+011		Sec motion ra	+013
Pri motion dec	+001		Sec motion dec	+001
Notes	N (See Notes)

Visually invisible, K-band or other infrared star rPM=0.153 (< 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		88297	20105+2920	BRT 46	AB	1893	2015	19	79	5.3	11.24	11.80	0.56		<===
Show		88297	20105+2920	MLB 477	AC	1926	2018	11	24	113.7	11.24	7.59	3.65
Show		88297	20105+2920	HDS2874	Ca,Cb	1991	1991	1	275	0.3	7.61	11.49	3.88

Quadruple system
3 visible stars in this system

Precise pa	78.9		Precise sep	5.269		Constellation	Vulpecula		SAO	88297
Gaia DR2	45609947136

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20105+2920	BRT 46	AB	2003	10	79	5.3	11.24	11.80		D	201028.74+292004.8
20105+2920	BRT 46	AB	2006	15	80	5.3	11.24	11.80		N	201028.74+292004.8
20105+2920	BRT 46	AB	2010	16	78	4.5	11.24	11.80		N	201028.74+292004.8
20105+2920	BRT 46	AB	2015	16	79	5.3	11.24	11.80		N	201028.74+292004.8

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