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	2022		Obs	1809
Pa first	35		Pa last	153.5		P.A. Now (θ)	153.5°
Sep first	19.6		Sep last	31.99		Sep. Now (ρ)	31.99"
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	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

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		GL	Gl 820A
BD	BD+38 4343		Flamsteed	61 Cygni		Flamsteed name	61 Cyg		FK5	793
Distance	3.49		Distance ly	11.38

Period (P)	704.858y	± 40.221	Periastron (T)	1696.004y	± 6.742	Semi-major axis (a)	24.57a	± 3.5
Eccentricity (e)	0.435	± 0.044	Inclination (i)	52.018°	± 0.443	Longitude of periastron (ω)	154.044°	± 6.821
Node (Ω)	174.56°	± 2.514	Notes	n		Reference	PkO2021b
Equinox			Last observation	2019		Grade	4	(1=Definitive, 9=Indet.)

label theta rho 2000 149.8 30.638 2001 150.0 30.703 2002 150.1 30.767 2003 150.3 30.830 2004 150.5 30.893 2005 150.7 30.956 2006 150.9 31.017 2007 151.0 31.079 2008 151.2 31.139 2009 151.4 31.199 2010 151.6 31.259 2011 151.7 31.318 2012 151.9 31.376 2013 152.1 31.434 2014 152.3 31.491 2015 152.4 31.548 2016 152.6 31.604 2017 152.8 31.659 2018 152.9 31.714 2019 153.1 31.768 2020 153.3 31.822 2021 153.5 31.875 2022 153.6 31.928 2023 153.8 31.979 2024 154.0 32.031 2025 154.1 32.081 2026 154.3 32.132 2027 154.4 32.181 2028 154.6 32.230 2029 154.8 32.278 2030 154.9 32.326 2031 155.1 32.373 2032 155.3 32.419 2033 155.4 32.465 2034 155.6 32.511 2035 155.8 32.555 2036 155.9 32.599 2037 156.1 32.642 2038 156.2 32.685 2039 156.4 32.727 2040 156.6 32.769 2041 156.7 32.810 2042 156.9 32.850 2043 157.0 32.889 2044 157.2 32.928 2045 157.3 32.967 2046 157.5 33.004 2047 157.7 33.041 2048 157.8 33.078 2049 158.0 33.114 2050 158.1 33.149		Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic