20205+4351 IOT   2Aa,Ab

 
 
20h 20m 27.98s +43 51' 16.3" P.A. 161.1 sep 0.01 mag 6.85, Sp WR+O dist. 4000 pc (13048 l.y.)
 
 
Coord 2000
20205+4351
Discov num
IOT   2
Comp
Aa,Ab
Coord arcsec 2000
20 20 27.98 +43 51 16.3
Date first
2003
Date last
2009
Obs
7
Pa first
152
Pa last
171
P.A. Now (θ)
161.1°
Sep first
0.0
Sep last
0.0
Sep. Now (ρ)
0.01"
Mag pri
6.85
Mag sec
delta mag (ΔM)
Spectral class
WR+O (Wolf-Rayet/blue)
Pri motion ra
-003
Sec motion ra
Pri motion dec
-008
Sec motion dec
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
20205+4351 SYSTEM COMPONENTS
 
 
Show name SAO coord_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show 20205+4351 IOT 2 Aa,Ab 2003 2009 7 161 0.0 6.85 Y <===
Show 20205+4351 BU 1207 AB 1890 2008 9 211 4.8 6.85 14.40 7.55
Show 20205+4351 TRN 29 AC 2001 2001 1 202 2.3 6.85 16.00 9.15
Quadruple system
3 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
171.1
Precise sep
0.006
Var name
V1687 Cyg
Constellation
Cygnus
HIP
100287
HD
193793
Distance
4000
Distance ly
13048
last precise pa
171.1
last precise sep
0.006
 
 
ORBITAL ELEMENTS
 
 
Period (P)2896.35d (7.93y)± 0.9 Periastron (T)46155.7m (1985.247y)± 3 Semi-major axis (a)8.99m± 0.19
Eccentricity (e)0.901± 0.005 Inclination (i)118.9°± 0.9 Longitude of periastron (ω)48.2°± 1.9
Node (Ω)354.2°± 0.7 Note Grade3(1=Definitive, 9=Indet.)
Equinox2009 Last observation
label rho theta
2000-01-01 0.006 121.9
2001-01-01 0.001 30.2
2002-01-01 0.009 162.4
2003-01-01 0.012 155.3
2004-01-01 0.013 150.6
2005-01-01 0.013 146.1
2006-01-01 0.012 141.2
2007-01-01 0.009 134.3
2008-01-01 0.006 120.3
2009-01-01 0.001 0.4
2010-01-01 0.009 161.7
2011-01-01 0.012 155.0
2012-01-01 0.013 150.3
2013-01-01 0.013 145.8
2014-01-01 0.012 140.8
2015-01-01 0.009 133.6
2016-01-01 0.005 118.6
2017-01-01 0.001 235.7
2018-01-01 0.009 161.1
2019-01-01 0.012 154.6
2020-01-01 0.013 149.9
2021-01-01 0.013 145.5
2022-01-01 0.011 140.4
2023-01-01 0.009 133.0
2024-01-01 0.005 116.6
2025-01-01 0.002 188.9
2026-01-01 0.010 160.5
2027-01-01 0.012 154.3
2028-01-01 0.013 149.6
2029-01-01 0.013 145.2
2030-01-01 0.011 139.9

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

grafico orbita





wds20205%2B4351a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
20205+4351 IOT 2 Aa,Ab 2009 7 171 0.0 6.85   WR + O NO 202027.98+435116.3

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