20422+5020 BU  675AB (51 Cyg)

 
 
20h 42m 12.63s +50 20' 24.1" P.A. 103 sep 3.1 mag 5.38,12.40 Sp B2V
 
 
Coord 2000
20422+5020
Discov num
BU  675
Comp
AB
Coord arcsec 2000
20 42 12.63 +50 20 24.1
Date first
1878
Date last
1934
Obs
8
Pa first
102
Pa last
103
P.A. Now (θ)
103°
Sep first
3.1
Sep last
3.1
Sep. Now (ρ)
3.1"
Mag pri
5.38
Mag sec
12.40
delta mag (ΔM)
7.02
Spectral class
B2V (blue-white)
Pri motion ra
-003
Sec motion ra
Pri motion dec
+002
Sec motion dec
Notes
N (See Notes)
Nature of this double is uncertain.
 
 
20422+5020 SYSTEM COMPONENTS
 
 
Show name SAO coord_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show 51 Cyg 32809 20422+5020 BU 675 AB 1878 1934 8 103 3.1 5.38 12.40 7.02 <===
Show 20422+5020 BU 675 AC 1878 2013 10 185 28.8 5.38 11.40 6.02
Show 20422+5020 BU 675 AD 1878 2013 9 329 33.1 5.38 11.40 6.02
Show 32809 20422+5020 BU 675 AE 1899 2013 11 240 71.7 5.38 10.64 5.26
Quintuple system
5 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
103.2
Precise sep
3.07
Name
51 Cyg
Constellation
Cygnus
SAO
32809
HD
197511
HR
7929
Flamsteed
51 Cygni
Flamsteed name
51 Cyg
last precise pa
103.2
last precise sep
3.07
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
20422+5020 BU 675 AB 1934 8 103 3.1 5.38 12.40 B2V N 204212.63+502024.1

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