21221+1948 STFB 11 AC

Coord 2000	21221+1948		Discov num	STFB 11		Comp	AC		Coord arcsec 2000	21 22 05.13 +19 48 15.7
Date first	1912		Date last	2017		Obs	8
Pa first	20		Pa last	13		P.A. Now (θ)	13°
Sep first	75.7		Sep last	64.34		Sep. Now (ρ)	64.34"
Mag pri	4.20		Mag sec	12.90		delta mag (ΔM)	8.7		Spectral class	K1III (yellow-orange)
Pri motion ra	+105		Sec motion ra	+003
Pri motion dec	+063		Sec motion dec	-017
Notes	N S (See Notes, Parallax indidates non-physical)

rPM=1.059 This double is not physical.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	1 Peg	107073	21 22 05 +19 48 16	STFB 11 AB	2020	85	313	36.6	4.20	9.30	5.10	Y
Show		107073	21 22 05 +19 48 16	STFB 11 AC	2017	8	13	64.3	4.20	12.90	8.70		<===
Show		107073	21 22 05 +19 48 16	TOK 9001 AD	1993	3	151	5.3	4.20	9.60	5.40

Quadruple system
4 estimated visually detectable stars in this system

Constellation	Pegasus		SAO	107073		HIP	105502		Tycho2	1671-00986-1
Gaia DR2	1790202365372381056		HD	203504		HR	8173		GC	29914
ADS	14909		BD	BD+19 4691		Flamsteed	1 Pegasi		Flamsteed name	1 Peg
FK5	804		Distance	47.78		Distance ly	155.86

discov_num	notes	refcode
STFB 11	1 Peg. STTA218. B is a spectroscopic binary, P = 1111d, and is
	BD+19@4690. Spectrum K0V.
	Mk III Limb-darkened diameter 4.7 +/- 0.4 mas.	MkT1989
	NPOI Limb-darkened diameter 2.315 +/- 0.023 mas, Sp = K1III,	NOI2018
	R = 11.89 +/- 0.15 \rsun, Teff = 4725 +/- 64 K, L = 63.5 +/- 3.3 \lsun,
	M = 1.60 +/- 0.18 \msun, Age = 2.04 +/- 0.54 Gyr.
	AB: H 5 20.	MEv2010

refcode	metd	author	reference
MEv2010	-	MacEvoy, B.	...................
MEv2010		private communication, 2010 (see http://www.handprint.com/ASTRO/index.html)
MkT1989	not j	Hutter, D.J., Johnston, K.J., Mozurkewich, D., Simon, R.S., Colavita, M.M., Pan,	1989ApJ...340.1103H
MkT1989		X.P., Shao, M., Hines, B.E., Staelin, D.H., Hershey, J.L., Hughes, J.A. & Kaplan,	.
MkT1989		G.H.	.
MkT1989		ApJ 340, 1103, 1989	.
NOI2018	not j	Baines, E.K., Armstrong, J.T., Schmitt, H.R., Zavala, R.T., Benson, J.A., Hutter,	2018AJ....155...30B
NOI2018		D.J., Tycner, C. & van Belle, G.T.
NOI2018		AJ 155, 30, 2018

idgroup	discov	author
1	STF	Struve, F.G.W.
34	TOK	Tokovinin, A.A.
81	TOK	Tokovinin, A.A., Balega, Y.Y., Pluzhnik, E.A., Shatsky, N.I., Gorynya, N.A., &
81	TOK	Weigelt, G.
95	TOK	Tokovinin, A., Cantarutti, R., Tighe, R., Schurter, P., van der Bliek, N.,
95	TOK	Martinez, M., & Mondaca, E.
163	TOK	Tokovinin, A., Corbett, H., Fors, O., Howard, W., Law, N.M., Moe, M.,
163	TOK	Ratzloff, J. & Walter, F.M.

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
21221+1948	STFB 11	AC	1921	2	19	74.3	4.20	12.10	K0.5III	N D	212205.13+194815.7
21221+1948	STFB 11	AC	2012	3	12	64.7	4.20	12.10	K0.5III	N D	212205.13+194815.7
21221+1948	STFB 11	AC	2017	6	13	64.3	4.20	12.90	K0.5III	N	212205.13+194815.7

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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

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