20170+1716 OSO 123AD

Coord 2000	20170+1716		Discov num	OSO 123		Comp	AD		Coord arcsec 2000	20 17 01.33 +17 15 45.9
Date first	1994		Date last	2015		Obs	11
Pa first	114		Pa last	99		P.A. Now (θ)	99°
Sep first	18.9		Sep last	21.1		Sep. Now (ρ)	21.1"
Mag pri	10.61		Mag sec	13.30		delta mag (ΔM)	2.69		Spectral class	K5 (yellow-orange)
Pri motion ra	-169		Sec motion ra	-002
Pri motion dec	-208		Sec motion dec	+000
Notes	N (See Notes)

Visually invisible, K-band or other infrared star rPM=0.995 This double is not physical.

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show			20170+1716	OSO 123	AB	1994	1994	2	264	10.0	10.61	18.30	7.69
Show			20170+1716	OSO 123	AC	1994	2015	11	349	17.9	10.61	14.20	3.59
Show			20170+1716	OSO 123	AD	1994	2015	11	99	21.1	10.61	13.30	2.69		<===
Show			20170+1716	OSO 123	AE	1994	2014	8	44	26.2	10.61	18.30	7.69

Quintuple system
5 visible stars in this system

Precise pa	98.5		Precise sep	21.135		Constellation	Sagitta		Tycho2	1635-00284-1
Gaia DR2	10169472256		HD	351944

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20170+1716	OSO 123	AD	1998	3	110	19.2	10.61	13.30		N D	201701.33+171545.9
20170+1716	OSO 123	AD	2001	4	108	19.5	10.61	13.30		N D	201701.33+171545.9
20170+1716	OSO 123	AD	2015	11	99	21.1	10.61	13.30	K5	N	201701.33+171545.9

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