20205+4351 BU 1207AB (V1687 Cyg)

 
 
20h 20m 27.98s +43 51' 16.3" P.A. 211 sep 4.8 mag 6.85,14.40 Sp WC6/7 dist. 4000 pc (13048 l.y.)
 
 
Coord 2000
20205+4351
Discov num
BU 1207
Comp
AB
Coord arcsec 2000
20 20 27.98 +43 51 16.3
Date first
1890
Date last
2015
Obs
10
Pa first
218
Pa last
211
P.A. Now (θ)
211°
Sep first
5.8
Sep last
4.8
Sep. Now (ρ)
4.8"
Mag pri
6.85
Mag sec
14.40
delta mag (ΔM)
7.55
Spectral class
WC6/7 (Wolf-Rayet)
Pri motion ra
-003
Sec motion ra
Pri motion dec
-008
Sec motion dec
Notes
N (See Notes)
Nature of this double is uncertain.
 
 
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 7 155 0.0 6.85 Y
Show V1687 Cyg 20205+4351 BU 1207 AB 1890 2015 10 211 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
210.6
Precise sep
4.783
Var name
V1687 Cyg
Constellation
Cygnus
SAO
49491
HIP
100287
Tycho2
3164-01678-1
Gaia DR2
72633822592
HD
193793
BD
BD+43 3571
Distance
4000
Distance ly
13048
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
20205+4351 BU 1207 AB 2002 8 210 4.8 6.85 14.40 N 202027.98+435116.3
20205+4351 BU 1207 AB 2008 9 211 4.8 6.85 14.40 N 202027.98+435116.3
20205+4351 BU 1207 AB 2015 10 211 4.8 6.85 14.40 WC6/7 N 202027.98+435116.3

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