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 dist. 390.63 pc (1274.24 l.y.)
 
 
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 32809 20422+5020 BU 675 AC 1878 2015 11 185 28.8 5.38 11.40 6.02
Show 32809 20422+5020 BU 675 AD 1878 2015 10 329 33.3 5.38 11.40 6.02
Show 32809 20422+5020 BU 675 AE 1899 2015 12 240 72.0 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
HIP
102177
Tycho2
3582-02132-1
HD
197511
HR
7929
GC
28865
BD
BD+49 3353
Flamsteed
51 Cygni
Flamsteed name
51 Cyg
Distance
390.63
Distance ly
1274.24
 
 
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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