20099+2055 STF2637AD

Coord 2000	20099+2055		Discov num	STF2637		Comp	AD		Coord arcsec 2000	20 09 56.61 +20 54 53.2
Date first	1887		Date last	2016		Obs	10
Pa first	229		Pa last	226		P.A. Now (θ)	226°
Sep first	158.0		Sep last	172.8		Sep. Now (ρ)	172.8"
Mag pri	6.56		Mag sec	11.94		delta mag (ΔM)	5.38		Spectral class	F3V (yellow-white)
Pri motion ra	+059		Sec motion ra	-005
Pri motion dec	+098		Sec motion dec	-003
Notes	N U (See Notes, Proper motion indicates non-physical)

Visually invisible, K-band or other infrared star rPM=1.045 This double is not 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	226.3		Precise sep	172.8		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	AD	2000	7	227	170.6	6.56		F3V	N D	200956.61+205453.2
20099+2055	STF2637	AD	2001	8	227	170.9	6.56	11.00	F3V	N D	200956.61+205453.2
20099+2055	STF2637	AD	2016	9	226	172.8	6.56	11.94	F3V	N	200956.61+205453.2

If you need more information about this double, apply for a data request form to the WDS.