20329+4154 BLA 8 (HD 195987)

 
 
20h 32m 51.64s +41 53' 54.5" P.A. 336.00 sep 0.0 mag 7.40,9.10 Sp G9V dist. 22.05 pc (71.93 l.y.)
 
 
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 6
Pa first 167 Pa last 336.3 P.A. Now (θ) 336.3°
Sep first 0.0 Sep last 0.013 Sep. Now (ρ) 0.013"
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)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 195987 Constellation Cygnus SAO 49769 HIP 101382
Tycho2 3161-00779-1 HD 195987 GC 28603 GL Gl 793.1
BD BD+41 3799 Distance 22.05 Distance ly 71.93
 
 
ORBITAL ELEMENTS
 
 
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 Notesn ReferenceRen2010
Equinox2000 Last observation1991 Grade5(1=Definitive, 9=Indet.)
label theta rho
2000-01-01 159.1 0.014
2001-01-01 142.5 0.014
2002-01-01 321.3 0.008
2003-01-01 153.5 0.019
2004-01-01 118.6 0.005
2005-01-01 197.3 0.003
2006-01-01 149.4 0.019
2007-01-01 342.9 0.007
2008-01-01 161.1 0.013
2009-01-01 144.2 0.015
2010-01-01 325.7 0.010
2011-01-01 154.5 0.018
2012-01-01 129.8 0.007
2013-01-01 244.4 0.002
2014-01-01 150.3 0.020
2015-01-01 351.9 0.005
2016-01-01 163.7 0.011
2017-01-01 145.6 0.017
2018-01-01 329.1 0.010
2019-01-01 155.6 0.017
2020-01-01 135.6 0.009
2021-01-01 291.2 0.003
2022-01-01 151.2 0.020
2023-01-01 12.2 0.003
2024-01-01 167.6 0.009
2025-01-01 146.8 0.018
2026-01-01 332.4 0.010
2027-01-01 156.8 0.016
2028-01-01 139.1 0.011
2029-01-01 310.0 0.005
2030-01-01 152.1 0.020


 
grafico orbita
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.



 
 


wds20329%2B4154a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic