20001+1731 H 4 100AB (13 Sge)

Coord 2000	20001+1731		Discov num	H 4 100		Comp	AB		Coord arcsec 2000	20 00 10.43 +17 30 09.1
Date first	1782		Date last	2013		Obs	19
Pa first	260		Pa last	265		P.A. Now (θ)	265°
Sep first	23.0		Sep last	23.9		Sep. Now (ρ)	23.9"
Mag pri	9.96		Mag sec	10.12		delta mag (ΔM)	0.16		Spectral class	K0 (yellow-orange)
Pri motion ra	+006		Sec motion ra	+003
Pri motion dec	-003		Sec motion dec	-008
Notes	N (See Notes)

Visually invisible, K-band or other infrared star rPM=0.682 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	13 Sge	105522	20001+1731	H 4 100	AB	1782	2013	19	265	23.9	9.96	10.12	0.16		<===
Show		105522	20001+1731	H 4 100	AC	1896	2013	17	297	112.6	9.96	5.57	4.39
Show		105522	20001+1731	H 4 100	BC	1900	2013	5	306	97.1	10.12	5.57	4.55
Show		105522	20001+1731	BU 1477	CD	1878	2013	8	208	27.0	5.57	13.40	7.83
Show		105522	20001+1731	BU 1477	CE	1924	2001	4	115	43.0	5.57	12.99	7.42

Quintuple system
5 visible stars in this system

Precise pa	265.3		Precise sep	23.87		Name	13 Sge		Constellation	Sagitta
SAO	105522		Gaia DR2	67976558208		HD	189577		HR	7645
DM	BD+17 4183		Flamsteed	13 Sagittae		Flamsteed name	13 Sge

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20001+1731	H 4 100	AB	2002	9	254	24.1	9.96	10.12	K0	N	200010.43+173009.1
20001+1731	H 4 100	AB	2010	14	254	24.2	9.96	10.12	K0	N	200010.43+173009.1
20001+1731	H 4 100	AB	2012	18	256	24.2	9.96	10.12	K0	N	200010.43+173009.1
20001+1731	H 4 100	AB	2013	19	265	23.9	9.96	10.12	K0	N	200010.43+173009.1

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