20318+4933 BU 1136

 
 
20h 31m 46.51s +49 32' 32.5" P.A. 215 sep 0.7 mag 7.75,9.19 Sp B9 dist. 197.63 pc (644.67 l.y.)
 
 
Coord 2000
20318+4933
Discov num
BU 1136
Comp
Coord arcsec 2000
20 31 46.51 +49 32 32.5
Date first
1889
Date last
2016
Obs
16
Pa first
207
Pa last
215
P.A. Now (θ)
215°
Sep first
0.4
Sep last
0.7
Sep. Now (ρ)
0.7"
Mag pri
7.75
Mag sec
9.19
delta mag (ΔM)
1.44
Spectral class
B9 (blue-white)
Pri motion ra
+006
Sec motion ra
+006
Pri motion dec
+008
Sec motion dec
+008
Notes
Nature of this double is uncertain.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
215
Precise sep
0.66
Constellation
Cygnus
SAO
49754
HIP
101284
Tycho2
3581-01451-1
Gaia DR2
83451898880
HD
195853
BD
BD+49 3305
Distance
197.63
Distance ly
644.67
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
20318+4933 BU 1136 2005 14 218 0.6 7.75 9.19 B9 D 203146.51+493232.5
20318+4933 BU 1136 2007 15 215 0.6 7.75 9.19 B9 D 203146.51+493232.5
20318+4933 BU 1136 2016 16 215 0.7 7.75 9.19 B9 203146.51+493232.5

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