21069+3845 STF 2758 AB (61 Cyg)

Coord 2000	21069+3845		Discov num	STF2758		Comp	AB		Coord arcsec 2000	21 06 53.95 +38 44 57.9
Date first	1753		Date last	2024		Obs	1814
Pa first	35		Pa last	153.7		P.A. Now (θ)	153.7°
Sep first	19.6		Sep last	32.05		Sep. Now (ρ)	32.05"
Mag pri	5.35		Mag sec	6.10		delta mag (ΔM)	0.75		Spectral class	K5V+K7V (yellow-orange/yellow-orange)
Pri motion ra	+417		Sec motion ra	+412
Pri motion dec	+326		Sec motion dec	+313
Notes	N O P (See Notes, Orbital solution, 100-year proper motion)

rPM=0.026 (< 0.3, Physical double) This double is physical.

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	2024	1814	154	32.1	5.35	6.10	0.75	Y	<===
Show		70919	21 06 54 +38 44 58	STF 2758 AC	2016	7	219	839.8	5.35	10.23	4.88
Show		164143	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		70919	21 06 54 +38 44 58	STF 2758 AF	2016	11	240	371.2	5.35	11.30	5.95
Show		70919	21 06 54 +38 44 58	STF 2758 AG	2016	15	236	260.4	5.35	11.30	5.95
Show		70919	21 06 54 +38 44 58	STF 2758 AH	2023	36	260	143.3	5.35	9.97	4.62
Show		70919	21 06 54 +38 44 58	SMR 1 AI	2023	18	235	59.9	5.35	10.74	5.39
Show		70919	21 06 54 +38 44 58	HZE 4 AJ	2015	4	241	17.5	5.35
Show		70919	21 06 54 +38 44 58	HZE 4 AK	2006	1	83	7.8	5.35
Show		70919	21 06 54 +38 44 58	SMR 40 AO	2024	15	271	188.7	5.35	12.65	7.30
Show		70919	21 06 54 +38 44 58	SMR 40 AP	2024	14	279	177.2	5.35	12.84	7.49
Show		70919	21 06 54 +38 44 58	SMR 40 AQ	2024	9	285	84.6	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
Show		33147	21 06 54 +38 45 00	SMR 94 ST	2024	2	113	2.0	13.50	13.90	0.40

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

Name	61 Cyg		Var name	V1803 Cyg		Constellation	Cygnus		SAO	70919
HIP	104214		Tycho2	3168-02800-1		Gaia DR2	1872047227813442688		HD	201091
HR	8085		GC	29509		ADS	14636		BD	BD+38 4343
Flamsteed	61 Cygni		Flamsteed name	61 Cyg		FK5	793		Distance	3.49
Distance ly	11.38

Period (P)	664.37y	± 26.84	Periastron (T)	1700.37y	± 12.95	Semi-major axis (a)	24.36a	± 0.47
Eccentricity (e)	0.457	± 0.034	Inclination (i)	53.29°	± 1.87	Longitude of periastron (ω)	149.32°	± 5.97
Node (Ω)	174.88°	± 1.8	Notes	n		Reference	PkO2017b
Equinox			Last observation	2006		Grade	4	(1=Definitive, 9=Indet.)

label theta rho 2000 149.8 30.629 2001 149.9 30.692 2002 150.1 30.756 2003 150.3 30.818 2004 150.5 30.880 2005 150.7 30.942 2006 150.8 31.003 2007 151.0 31.063 2008 151.2 31.123 2009 151.4 31.182 2010 151.5 31.240 2011 151.7 31.298 2012 151.9 31.355 2013 152.1 31.411 2014 152.2 31.467 2015 152.4 31.523 2016 152.6 31.577 2017 152.8 31.631 2018 152.9 31.684 2019 153.1 31.737 2020 153.3 31.789 2021 153.4 31.841 2022 153.6 31.891 2023 153.8 31.942 2024 153.9 31.991 2025 154.1 32.040 2026 154.3 32.088 2027 154.4 32.136 2028 154.6 32.182 2029 154.8 32.229 2030 154.9 32.274 2031 155.1 32.319 2032 155.3 32.363 2033 155.4 32.407 2034 155.6 32.450 2035 155.8 32.492 2036 155.9 32.533 2037 156.1 32.574 2038 156.2 32.614 2039 156.4 32.653 2040 156.6 32.692 2041 156.7 32.730 2042 156.9 32.768 2043 157.0 32.804 2044 157.2 32.840 2045 157.4 32.875 2046 157.5 32.910 2047 157.7 32.944 2048 157.8 32.977 2049 158.0 33.009 2050 158.1 33.041

Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st. Measures: green=micrometric, blue=interferometric, purple=photographic