20329+4154 BLA   8

Coord 2000	20329+4154		Discov num	BLA   8		Comp			Coord arcsec 2000	20 32 51.64 +41 53 54.5
Date first	1986		Date last	2014		Obs	5
Pa first	167		Pa last	336		P.A. Now (θ)	336°
Sep first	0.0		Sep last	0.0		Sep. Now (ρ)	0"
Mag pri	7.40		Mag sec	9.10		delta mag (ΔM)	1.7		Spectral class	G9V (yellow)
Pri motion ra	-153		Sec motion ra
Pri motion dec	+457		Sec motion dec
Notes	N O (See Notes, Orbital solution)

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

Precise pa	336.3		Precise sep	0.013		Constellation	Cygnus		SAO	49769
HIP	101382		Tycho2	3161-00779-1		HD	195987		GL	Gl 793.1
BD	BD+41 3799		Distance	22.05		Distance ly	71.93		last precise pa	336.3
last precise sep	0.013

Period (P)	57.322d	± 0.0002	Periastron (T)	51353.81d (1999.478y)	± 0.04	Semi-major axis (a)	15.2m	± 0.3
Eccentricity (e)	0.306	± 0.001	Inclination (i)	100°	± 6.3	Longitude of periastron (ω)	357.4°	± 0.3
Node (Ω)	330.9°	± 3.6	Note			Grade	5	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	1991

label rho theta 2000-01-01 0.014 159.1 2001-01-01 0.014 142.5 2002-01-01 0.008 321.3 2003-01-01 0.019 153.5 2004-01-01 0.005 118.6 2005-01-01 0.003 197.3 2006-01-01 0.019 149.4 2007-01-01 0.007 342.9 2008-01-01 0.013 161.1 2009-01-01 0.015 144.2 2010-01-01 0.010 325.7 2011-01-01 0.018 154.5 2012-01-01 0.007 129.8 2013-01-01 0.002 244.4 2014-01-01 0.020 150.3 2015-01-01 0.005 351.9 2016-01-01 0.011 163.7 2017-01-01 0.017 145.6 2018-01-01 0.010 329.1 2019-01-01 0.017 155.6 2020-01-01 0.009 135.6 2021-01-01 0.003 291.2 2022-01-01 0.020 151.2 2023-01-01 0.003 12.2 2024-01-01 0.009 167.6 2025-01-01 0.018 146.8 2026-01-01 0.010 332.4 2027-01-01 0.016 156.8 2028-01-01 0.011 139.1 2029-01-01 0.005 310.0 2030-01-01 0.020 152.1 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
20329+4154	BLA 8		1986	1	170	0.0	7.09		G9V	NO	203251.64+415354.5
20329+4154	BLA 8		2007	2	296	0.0	7.09		G9V	NOD	203251.64+415354.5
20329+4154	BLA 8		2014	5	336	0.0	7.40	9.10	G9V	NO	203251.64+415354.5

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