20251+5936 A   730

Coord 2000	20251+5936		Discov num	A   730		Comp			Coord arcsec 2000	20 25 05.00 +59 36 00.4
Date first	1904		Date last	2008		Obs	64
Pa first	314		Pa last	284		P.A. Now (θ)	241.1°
Sep first	0.2		Sep last	0.2		Sep. Now (ρ)	0.11"
Mag pri	6.94		Mag sec	7.63		delta mag (ΔM)	0.69		Spectral class	A2IV (white)
Pri motion ra	-002		Sec motion ra
Pri motion dec	-005		Sec motion dec
Notes	N O (See Notes, Orbital solution)

Visually invisible, K-band or other infrared star This double is physical.

Precise pa	283.9		Precise sep	0.157		Constellation	Cygnus		SAO	32562
HIP	100714		Tycho2	3949-02016-1		Gaia DR2	98775572096		HD	194882
HR	7818		ADS	13850		BD	BD+59 2228		Distance	251.26
Distance ly	819.61		last precise pa	283.9		last precise sep	0.157

Period (P)	175.089y		Periastron (T)	2038.638y		Semi-major axis (a)	0.231a
Eccentricity (e)	0.005		Inclination (i)	118.5°		Longitude of periastron (ω)	309.2°
Node (Ω)	152.2°		Note			Grade	3	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2008

label rho theta 2000 0.172 303.3 2001 0.168 301.5 2002 0.164 299.6 2003 0.159 297.6 2004 0.155 295.4 2005 0.151 293.2 2006 0.146 290.8 2007 0.142 288.3 2008 0.138 285.6 2009 0.134 282.8 2010 0.130 279.8 2011 0.127 276.6 2012 0.123 273.3 2013 0.120 269.7 2014 0.118 266.0 2015 0.115 262.2 2016 0.113 258.1 2017 0.112 254.0 2018 0.111 249.8 2019 0.110 245.4 2020 0.110 241.1 2021 0.110 236.8 2022 0.111 232.5 2023 0.112 228.3 2024 0.114 224.2 2025 0.116 220.2 2026 0.119 216.4 2027 0.122 212.8 2028 0.125 209.4 2029 0.128 206.1 2030 0.132 203.0 Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20251+5936	A 730		2004	62	293	0.2	6.94	7.63	A2IV	NO	202505.00+593600.4
20251+5936	A 730		2008	64	284	0.2	6.94	7.63	A2IV	NO	202505.00+593600.4
20251+5936	A 730		2009	64	274	0.2	6.94	7.63	A2IV	NO	202505.00+593600.4

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