18187-1837 BU  639AB

 
 
18h 18m 43.26s -18 37' 10.8" P.A. 137 sep 0.5 mag 7.20,8.20 Sp B0Ib
 
 
Coord 2000
18187-1837
Discov num
BU  639
Comp
AB
Coord arcsec 2000
18 18 43.26 -18 37 10.8
Date first
1878
Date last
2017
Obs
32
Pa first
155
Pa last
137
P.A. Now (θ)
137°
Sep first
0.6
Sep last
0.5
Sep. Now (ρ)
0.5"
Mag pri
7.20
Mag sec
8.20
delta mag (ΔM)
1
Spectral class
B0Ib (blue-white)
Pri motion ra
+004
Sec motion ra
Pri motion dec
-004
Sec motion dec
Notes
N (See Notes)
Nature of this double is uncertain.
 
 
18187-1837 SYSTEM COMPONENTS
 
 
Show name SAO coord_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show 161304 18187-1837 BU 639 AB 1878 2017 32 137 0.5 7.20 8.20 1.00 <===
Show 161304 18187-1837 SHJ 264 AB,C 1823 2017 54 52 17.2 6.86 7.63 0.77
Show 161304 18187-1837 FOX 225 AB,E 1916 2000 7 328 145.6 6.86 10.78 3.92
Show 161306 18187-1837 BU 300 CD 1874 1999 9 327 6.6 7.63 13.10 5.47
Quintuple system
6 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
136.7
Precise sep
0.467
Constellation
Sagittarius
SAO
161304
Tycho2
6269-04010-1
HD
168021
HR
6848
last precise pa
136.7
last precise sep
0.467
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
18187-1837 BU 639 AB 1996 30 143 0.4 7.20 8.20 B0Ib N 181843.26-183710.8
18187-1837 BU 639 AB 2008 31 140 0.5 7.20 8.20 B0Ib N 181843.26-183710.8
18187-1837 BU 639 AB 2017 32 137 0.5 7.20 8.20 B0Ib N 181843.26-183710.8

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