20203+3924 A  1427AB

Coord 2000	20203+3924		Discov num	A  1427		Comp	AB		Coord arcsec 2000	20 20 15.22 +39 24 11.8
Date first	1906		Date last	2012		Obs	49
Pa first	112		Pa last	132		P.A. Now (θ)	146.4°
Sep first	0.3		Sep last	0.2		Sep. Now (ρ)	0.17"
Mag pri	6.57		Mag sec	8.17		delta mag (ΔM)	1.6		Spectral class	A2V+A5V (white/white)
Pri motion ra	-003		Sec motion ra
Pri motion dec	-029		Sec motion dec
Notes	N O (See Notes, Orbital solution)

This double is physical.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		69856	20 20 15 +39 24 12	A 1427 AB	2012	49	146	0.2	6.57	8.17	1.60	Y	<===
Show		69856	20 20 15 +39 24 12	STF 2668 AB,C	2016	64	280	3.5	6.34	8.49	2.15

Triple system
4 visible stars in this system

Precise pa	132.4		Precise sep	0.19		Constellation	Cygnus		SAO	69856
HIP	100268		Tycho2	3156-02225-1		Gaia DR2	2061463669341204736		HD	193702
HR	7784		ADS	13728		BD	BD+38 4021		Distance	180.51
Distance ly	588.82		last precise pa	132.4		last precise sep	0.19

Period (P)	82.61y		Periastron (T)	2032.75y		Semi-major axis (a)	0.25a
Eccentricity (e)	0.879		Inclination (i)	56.1°		Longitude of periastron (ω)	238.3°
Node (Ω)	70.4°		Note			Grade	3	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2008

label rho theta 2000 0.306 118.5 2001 0.302 119.3 2002 0.297 120.1 2003 0.292 120.9 2004 0.287 121.8 2005 0.282 122.7 2006 0.277 123.6 2007 0.271 124.6 2008 0.265 125.6 2009 0.259 126.7 2010 0.253 127.8 2011 0.246 128.9 2012 0.239 130.2 2013 0.232 131.5 2014 0.225 132.9 2015 0.217 134.3 2016 0.209 135.9 2017 0.201 137.7 2018 0.192 139.5 2019 0.184 141.6 2020 0.175 143.9 2021 0.166 146.4 2022 0.156 149.2 2023 0.146 152.3 2024 0.136 155.9 2025 0.126 160.1 2026 0.116 165.1 2027 0.105 171.0 2028 0.095 178.3 2029 0.084 187.3 2030 0.073 199.0		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
20203+3924	A 1427	AB	2007	42	131	0.3	6.57	8.17	A2V+A5V	NOD	202015.22+392411.8
20203+3924	A 1427	AB	2008	46	130	0.3	6.57	8.17	A2V+A5V	NOD	202015.22+392411.8

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