21069+3845 HZE 4 AK

Coord 2000	21069+3845		Discov num	HZE   4		Comp	AK		Coord arcsec 2000	21 06 53.95 +38 44 57.9
Date first	2006		Date last	2006		Obs	1
Pa first	83		Pa last	83.2		P.A. Now (θ)	83.2°
Sep first	7.8		Sep last	7.78		Sep. Now (ρ)	7.78"
Mag pri	5.35		Mag sec			delta mag (ΔM)			Spectral class	K5V (yellow-orange)
Pri motion ra	+417		Sec motion ra
Pri motion dec	+326		Sec motion dec
Notes	N P (See Notes, 100-year proper motion)

Nature of this double is uncertain.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	61 Cyg	70919	21 06 54 +38 44 58	STF 2758 AB	2022	1809	154	32.0	5.35	6.10	0.75	Y
Show			21 06 54 +38 44 58	STF 2758 AC	2016	7	219	839.8	5.35	10.23	4.88
Show		70919	21 06 54 +38 44 58	STF 2758 AD	2016	5	250	748.0	5.35	10.45	5.10
Show		70919	21 06 54 +38 44 58	STF 2758 AE	2016	13	267	340.8	5.35	9.63	4.28
Show			21 06 54 +38 44 58	STF 2758 AF	2016	11	240	371.2	5.35	11.30	5.95
Show			21 06 54 +38 44 58	STF 2758 AG	2016	14	236	260.4	5.35	11.30	5.95
Show			21 06 54 +38 44 58	STF 2758 AH	2021	34	263	134.0	5.35	9.97	4.62
Show			21 06 54 +38 44 58	SMR 1 AI	2021	16	236	49.3	5.35	10.74	5.39
Show			21 06 54 +38 44 58	HZE 4 AJ	2015	4	241	17.5	5.35
Show			21 06 54 +38 44 58	HZE 4 AK	2006	1	83	7.8	5.35				<===
Show			21 06 54 +38 44 58	SMR 40 AO	2021	12	275	176.6	5.35	12.65	7.30
Show			21 06 54 +38 44 58	SMR 40 AP	2021	11	284	166.5	5.35	12.84	7.49
Show			21 06 54 +38 44 58	SMR 40 AQ	2021	7	295	76.1	5.35	13.19	7.84
Show			21 06 55 +38 44 32	STF 2758 BC	2016	7	221	827.6	6.10	10.03	3.93
Show			21 06 55 +38 44 32	HZE 4 BL	2006	1	145	9.9	6.10
Show			21 06 55 +38 44 32	FYM 106 BM	2016	4	238	100.7	6.10	14.30	8.20
Show			21 06 55 +38 44 32	FYM 106 BN	2016	4	152	48.3	6.05	14.40	8.35
Show			21 06 55 +38 44 32	TNN 15 BR	2005	1	77	11.5	6.10

18-fold system
18 estimated visually detectable stars in this system

Constellation

Cygnus

Gaia DR2

1872047227813442688

discov_num	notes	refcode
STF2758	61 Cyg. According to R.G. Aitken, this was discovered in 1753 by	A__1935f
	Bradley. Premature orbits have been computed for AB. This is an	Bdy1832A
	example of a binary known by its common parallax and proper motion
	rather than the orbital motion, which has completed approximately
	one-sixth of an orbit in the past 200 years. The extremely large
	proper motion of this pair has led to some confusion in identification
	of others stars measured relative to the primary. Precise epoch-2000
	coordinates and UCAC2 catalog cross-identifications are listed below:
	A = UCAC2 50084730 = 2106539+384457 pm = +5328 +3258
	B = UCAC2 50084732 = 2106552+384431 pm = +5267 +3143
	C = UCAC2 45407969 = 2106142+383502 +007+006
	D = UCAC2 45407870 = 2105597+384133 +002-006
	E = UCAC2 45408060 = 2106306+384532 +012-007
	F = UCAC2 45408067 = 2106322+384246 +019-002
	G = UCAC2 45408111 = 2106413+384325 +000-002
	H = UCAC2 45408157 = 2106502+384551 -004-006
	The Aa pair was renamed AF. The G and H components were both initially
	believed to be the C component. B is BD+38@4344.
	AB: Statistically the same parallax within the errors would indicate
	the components are physical.
	AB: H 4 18.	MEv2010
	An estimated mass has been used by Josties (1981) to compute the	Jti1981
	otherwise nearly indeterminate orbit; thus the orbit should not be
	used to compute the mass. The RV difference from which the ascending
	node is inferred is quite small. Various small variations, formerly
	suspected in the period range of about 5-10 years, are absent in the
	strong photographic coverage of the last decades.
	See Baize & Petit (1989) catalog of doubles with variable component.	Baz1989d
	Resulting component masses are 0.74 +/- 0.13 and 0.46 +/- 0.07 Msun.	PkO2006b
	HIP 104214. See Allen et al. (2000) for information on metallicity,	AlC2000
	age, galactic orbital parameters, etc.
	CHARA Array Limb-darkened diameter of A,B:	CIA2008e
	1.775 +/- 0.013, 1.581 +/- 0.022 mas.
	R = 0.665 +/- 0.005, 0.595 +/- 0.008 \rsun,
	L = 0.153 +/- 0.010, 0.085 +/- 0.007 \lsun,
	Teff = 4400 +/- 100, 4040 +/- 80 K.
	AB: NLTT 50559/50560	Chm2004
	BC: Optical pair, based on study of relative motion of the components
	using the method of apparent motion parameters.	Kiy2008
	Inclination of orbit flipped by 180 deg in accordance with available	Pko2017b
	data by cataloger.
	Analysis of long term photometric variability of both components	PkO2019a
	reliable photometric variability with periods of about 15 years and
	variation of 0.05(0.02) magnitudes for both components as well as a
	9 year variation for B.
HZE 4	Heinze et al. (2010) determine that the J, K, and L components are all
	background objects.	Hze2010
STF2758	AC, AE, AF, AG, AH: Rectilinear solutions by Mason & Hartkopf (2016).	Msn2016a
SMR 1	AI: Rectilinear solution by Mason & Hartkopf (2016).	Msn2016a
SMR 40	AO, AP: Rectilinear solutions by Mason & Hartkopf (2016).	Msn2016a
STF2758	BC: Rectilinear solution by Mason & Hartkopf (2016).	Msn2016a
FYM 106	BN: Rectilinear solution by Mason & Hartkopf (2016).	Msn2016a

refcode	metd	author	reference
A__1935f	-	Aitken, R.G.	1935QB821.A3.......
A__1935f		The Binary Stars, 1935
AlC2000	Po -	Allen, C., Poveda, A., & Herrera, M	2000A&A...356..529A
AlC2000		A&A 356, 529, 2000
Baz1989d	-	Baize, P. & Petit, M.	1989A&AS...77..497B
Baz1989d		A&AS 77, 497, 1989
Bdy1832A	Ma -	Bradley, J.	1833MmRAS...5...13H
Bdy1832A		Memoirs, Oxford, 1832
Bdy1832A		(as cited by Herschel, MemRAS 5, 13, 1833)
Chm2004	E -	Chaname, J. & Gould, A.	2004ApJ...601..289C
Chm2004		ApJ 601, 289, 2004
Chm2004		(Photometry, coordinates, and astrometry from rNLTT. Astrometry from early
Chm2004		versions of 2MASS and UCAC, with date given only as "circa 2000". Measures
Chm2004		identical to discovery observations - predominantly close pairs - were assumed
Chm2004		not new observations, so not included in WDS. Similar concerns when primary and
Chm2004		secondary magnitudes or proper motions were the same.)
CIA2008e	not j	Kervella, P., Merand, A., Pichon, B., Thevenin, F., Heiter, U., Bigot, L.,	2008A&A...488..667K
CIA2008e		ten Brummelaar, T.A., McAlister, H.A., Ridgway, S.T., Turner, N., Sturmann, J.,	.
CIA2008e		Sturmann, L., Goldfinger, P.J. & Farrington, C.	.
CIA2008e		A&A 488, 667, 2008	.
Hze2010	A j	Heinze, A.N., Hinz, P.M., Sivanandam, S., Kenworthy, M., Meyer, M., & Miller, D.	2010ApJ...714.1551H
Hze2010		ApJ 714, 1551, 2010
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)
Msn2016a	lin -	Mason, B.D. & Hartkopf, W.I.	2016IAUDS.189....1M
Msn2016a		Inf. Circ. 189, 1, 2016
PkO2006b	orb -	Gorshanov, D.L., Shakht, N.A. & Kisselev, A.A.	2006SvA....49..386K
PkO2006b		SvA 49, 386, 2006
PkO2017b	Po -	Shakht, N.A., Gorshanov, D.L. & Vasilkova, O.O.	2017Ap.....60..507S
PkO2017b	+orb	Astrophysics 60, 507, 2017
PkO2017b		Note: Published J2000 PA precessed to epoch of observation for consistency.

idgroup	discov	author
1	FYM	Fay, M.
28	SMR	Schlimmer, J.
83	STF	Struve, F.G.W.
116	TNN	Tanner, A.M., Gelino, C.R., & Law, N.M.

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
21069+3845	HZE 4	AK	2006	1	83	7.8	5.20	16.00	K5V	N DP	210653.94+384457.8

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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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