20099+2055 STF 2637 AD

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	226.3		P.A. Now (θ)	226.3°
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)

rPM=1.045 This double is not physical.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	The Sge	88276	20 09 57 +20 54 53	STF 2637 AB	2020	143	331	11.6	6.56	8.85	2.29
Show		88276	20 09 57 +20 54 53	STF 2637 AC	2020	97	222	91.9	6.56	7.52	0.96
Show		88276	20 09 57 +20 54 53	STF 2637 AD	2016	10	226	172.8	6.56	11.94	5.38		<===
Show		88270	20 09 56 +20 55 04	STF 2637 BC	2017	60	215	95.7	8.85	7.52	1.33

Quadruple system
4 estimated visually detectable stars in this system

Constellation	Sagitta		SAO	88276		HIP	99352		Tycho2	1630-00481-1
Gaia DR2	1829590548393010560		HD	191570		HR	7705		GC	27987
ADS	13442		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
Bayer greek	θ Sge

discov_num	notes	refcode
STF2637	the Sge = 17 Sge. STTA201 = STFA 49. B is BD+20@4455.
	AC: Optical pair, based on study of relative motion of the components
	using the method of apparent motion parameters.	Kiy2008
	BC: Mt. Wilson spectral type of B is G3, C is K1.
	AB: HJL 272.	HJL1986
	AB: H 3 24.	MEv2010

refcode	metd	author	reference
HJL1986	Pa -	Halbwachs, J.L.	1986A&AS...66..131H
HJL1986		A&AS 66, 131, 1986
HJL1986		(Possible CPM pairs from AGK2/3. Coarse astrometry, incl. mean 1950 dates, added
HJL1986		only for previously unknown pairs. Table 1: HJL 1 - 326, Table 2: HJL1001 - 1113)
Kiy2008	-	Kiyaeva, O.V., Kiselev, A.A. & Izmailov, I.S.	2008SvAL...32..405K
Kiy2008		SvAL 34, 405, 2008
MEv2010	-	MacEvoy, B.	...................
MEv2010		private communication, 2010 (see http://www.handprint.com/ASTRO/index.html)

idgroup	discov	author
1	STF	Struve, F.G.W.

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

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Radius: auto 0.5" 0.8" 1" 2" 3" 5" 10" 15" 20" 25" 30" 35" 40" 45" 50" 55" 1' 2' 3' 4' 5' 6' 7' 8' 9' 10' 15' 20' 30' 40' 50' 1° 2° 4° 5° 8° Components only

DSS color DSS blue 2MASS AllWISE GALEX SDSS9 XMM PanSTARRS