20205+4351 IOT   2Aa,Ab

 
 
20H 20M 27.98S +43 51' 16.3" P.A. 235.7 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)
235.7°
Sep first
0.0
Sep last
0.0
Sep. Now (ρ)
0"
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 49491 20205+4351 IOT 2 Aa,Ab 2003 2009 7 236 0.0 6.85 Y <===
Show V1687 Cyg 49491 20205+4351 BU 1207 AB 1890 2008 9 211 4.8 6.85 14.40 7.55
Show 49491 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
 
 
Var name
V1687 Cyg
Constellation
Cygnus
SAO
49491
HIP
100287
Tycho2
3164-01678-1
HD
193793
BD
BD+43 3571
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





grafico misure orbit6
Measures: green=micrometric, blue=interferometric, purple=photographic