20205+4351 IOT 2 Aa,Ab (V1687 Cyg)

 
 
20h 20m 27.98s +43° 51' 16.3" P.A. 152.00 sep 0.0 mag 6.10,6.30 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 2019 Obs 11
Pa first 152 Pa last 152.4 P.A. Now (θ) 313.2°
Sep first 0.0 Sep last 0.013 Sep. Now (ρ) 0.009"
Mag pri 6.10 Mag sec 6.30 delta mag (ΔM) 0.2 Spectral class WR+O (Wolf-Rayet/blue)
Pri motion ra -003 Sec motion ra
Pri motion dec -008 Sec motion dec
Notes N O K (See Notes, Orbital solution, K-band or other infrared magnitudes)
Visually invisible, K-band or other infrared star : Summary line gives K-band or other infrared (>1 micron) magnitudes
This double is physical.
 
 
20205+4351 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show V1687 Cyg 49491 20 20 28 +43 51 16 IOT 2 Aa,Ab 2019 11 152 0.0 6.10 6.30 0.20 Y <===
Show 49491 20 20 28 +43 51 16 BU 1207 AB 2015 10 211 4.8 6.85 14.40 7.55
Show 49491 20 20 28 +43 51 16 TRN 29 AC 2001 1 202 2.3 6.85 16.00 9.15
Quadruple system
3 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Var name V1687 Cyg Constellation Cygnus SAO 49491 HIP 100287
Tycho2 3164-01678-1 Gaia DR2 2081261372633822592 HD 193793 ADS 13736
BD BD+43 3571 Distance 4000 Distance ly 13048
 
 
ORBITAL ELEMENTS
 
 
Period (P)2895d (7.93y)± 0.29 Periastron (T)60636.23d (2024.892y)± 0.53 Semi-major axis (a)8.922m± 0.067
Eccentricity (e)0.8993± 0.0013 Inclination (i)119.07°± 0.88 Longitude of periastron (ω)227.44°± 0.52
Node (Ω)353.87°± 0.67 Notesn ReferenceCIA2021a
Equinox Last observation2019 Grade2(1=Definitive, 9=Indet.)
label theta rho
2000-01-01 302.3 0.006
2001-01-01 212.1 0.002
2002-01-01 342.6 0.009
2003-01-01 335.5 0.012
2004-01-01 330.7 0.013
2005-01-01 326.3 0.013
2006-01-01 321.4 0.012
2007-01-01 314.5 0.009
2008-01-01 300.7 0.006
2009-01-01 181.4 0.001
2010-01-01 341.9 0.009
2011-01-01 335.1 0.012
2012-01-01 330.4 0.013
2013-01-01 326.0 0.013
2014-01-01 321.0 0.012
2015-01-01 313.9 0.009
2016-01-01 298.9 0.005
2017-01-01 56.5 0.001
2018-01-01 341.2 0.009
2019-01-01 334.8 0.012
2020-01-01 330.1 0.013
2021-01-01 325.7 0.013
2022-01-01 320.5 0.011
2023-01-01 313.2 0.009
2024-01-01 296.8 0.005
2025-01-01 8.7 0.002
2026-01-01 340.6 0.010
2027-01-01 334.4 0.012
2028-01-01 329.8 0.013
2029-01-01 325.3 0.013
2030-01-01 320.1 0.011


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



 
 


wds20205%2B4351b.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic