20099+2055 STF2637AB (The Sge)

Coord 2000	20099+2055		Discov num	STF2637		Comp	AB		Coord arcsec 2000	20 09 56.61 +20 54 53.2
Date first	1800		Date last	2019		Obs	141
Pa first	329		Pa last	331		P.A. Now (θ)	331°
Sep first	6.0		Sep last	11.7		Sep. Now (ρ)	11.7"
Mag pri	6.56		Mag sec	8.85		delta mag (ΔM)	2.29		Spectral class	F3V (yellow-white)
Pri motion ra	+059		Sec motion ra	+066
Pri motion dec	+098		Sec motion dec	+102
Notes	N T (See Notes, Parallax indicates physical)

Visually invisible, K-band or other infrared star rPM=0.066 (< 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	The Sge	88276	20099+2055	STF2637	AB	1800	2019	141	331	11.7	6.56	8.85	2.29		<===
Show		88276	20099+2055	STF2637	AC	1800	2017	96	222	91.3	6.56	7.52	0.96
Show		88276	20099+2055	STF2637	AD	1887	2016	10	226	172.8	6.56	11.94	5.38
Show		88276	20099+2055	STF2637	BC	1800	2017	60	215	95.7	8.85	7.52	1.33

Quadruple system
4 visible stars in this system

Precise pa	331		Precise sep	11.671		Name	The Sge		Constellation	Sagitta
SAO	88276		HIP	99352		Tycho2	1630-00481-1		Gaia DR2	48393010560
HD	191570		HR	7705		GC	27987		BD	BD+20 4453
Bayer	Theta Sagittae		Bayer name	The Sge		Flamsteed	17 Sagittae		Flamsteed name	17 Sge
Distance	45.25		Distance ly	147.61

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20099+2055	STF2637	AB	2006	115	330	11.7	6.56	8.85	F3V	N DV	200956.61+205453.2
20099+2055	STF2637	AB	2008	116	331	11.6	6.56	8.85	F3V	N DV	200956.61+205453.2
20099+2055	STF2637	AB	2009	122	332	11.5	6.56	8.85	F3V	NVD	200956.61+205453.2
20099+2055	STF2637	AB	2011	124	331	11.6	6.56	8.85	F3V	NVD	200956.61+205453.2
20099+2055	STF2637	AB	2012	127	333	11.6	6.56	8.85	F3V	NVD	200956.61+205453.2
20099+2055	STF2637	AB	2013	129	332	11.5	6.56	8.85	F3V	NVD	200956.61+205453.2
20099+2055	STF2637	AB	2014	131	330	11.7	6.56	8.85	F3V	NVD	200956.61+205453.2
20099+2055	STF2637	AB	2015	134	331	11.6	6.56	8.85	F3V	NV	200956.61+205453.2
20099+2055	STF2637	AB	2016	134	331	11.6	6.56	8.85	F3V	NV	200956.61+205453.2
20099+2055	STF2637	AB	2017	137	332	11.6	6.56	8.85	F3V	NV	200956.61+205453.2
20099+2055	STF2637	AB	2018	138	332	11.6	6.56	8.85	F3V	NV	200956.61+205453.2
20099+2055	STF2637	AB	2019	141	331	11.7	6.56	8.85	F3V	NT	200956.61+205453.2

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