20338+4540 A   740

 
 
20h 33m 50.35s +45 39' 41.2" P.A. 313 sep 0.8 mag 9.64,9.95 Sp O5V
 
 
Coord 2000
20338+4540
Discov num
A   740
Comp
Coord arcsec 2000
20 33 50.35 +45 39 41.2
Date first
1904
Date last
2016
Obs
16
Pa first
314
Pa last
313
P.A. Now (θ)
313°
Sep first
0.8
Sep last
0.8
Sep. Now (ρ)
0.8"
Mag pri
9.64
Mag sec
9.95
delta mag (ΔM)
0.31
Spectral class
O5V (blue)
Pri motion ra
+000
Sec motion ra
+000
Pri motion dec
-007
Sec motion dec
-007
Notes
Nature of this double is uncertain.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
312.5
Precise sep
0.83
Constellation
Cygnus
SAO
49801
Tycho2
3573-00385-1
Gaia DR2
45679972096
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
20338+4540 A 740 2007 13 313 0.9 9.64 9.95 O8 203350.35+453941.2
20338+4540 A 740 2009 14 314 0.8 9.64 9.95 O8 203350.35+453941.2
20338+4540 A 740 2016 16 313 0.8 9.64 9.95 O5V 203350.35+453941.2

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