16212-2536 BLM   4Aa,Ab

 
 
16h 21m 11.32s -25 35' 33.9" P.A. 225 sep 0.5 mag 3.06,5.24 Sp B0.5III dist. 213.68 pc (697.02 l.y.)
 
 
Coord 2000
16212-2536
Discov num
BLM   4
Comp
Aa,Ab
Coord arcsec 2000
16 21 11.32 -25 35 33.9
Date first
1976
Date last
2016
Obs
23
Pa first
292
Pa last
225
P.A. Now (θ)
225°
Sep first
0.3
Sep last
0.5
Sep. Now (ρ)
0.5"
Mag pri
3.06
Mag sec
5.24
delta mag (ΔM)
2.18
Spectral class
B0.5III (blue-white)
Pri motion ra
-011
Sec motion ra
Pri motion dec
-016
Sec motion dec
Notes
N (See Notes)
Nature of this double is uncertain.
 
 
16212-2536 SYSTEM COMPONENTS
 
 
Show name SAO coord_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show 184336 16212-2536 NOR 1 Aa1,2 2010 2010 1 89 0.0 3.30 4.10 0.80 Y
Show 184336 16212-2536 BLM 4 Aa,Ab 1976 2016 23 225 0.5 3.06 5.24 2.18 <===
Show Alniyat 184336 16212-2536 H 4 121 AB 1783 2016 44 273 20.3 2.89 8.42 5.53
Quadruple system
2 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
225
Precise sep
0.5
Constellation
Scorpius
SAO
184336
HIP
80112
Tycho2
6798-00540-1
HD
147165
HR
6084
GC
21982
CD
CD-2511485
CP
CP-25 5785
Bayer
Sigma Scorpii
Bayer name
Sig Sco
Flamsteed
20 Scorpii
Flamsteed name
20 Sco
Distance
213.68
Distance ly
697.02
last precise pa
225
last precise sep
0.5
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
16212-2536 BLM 4 Aa,Ab 2000 22 244 0.5 3.06 5.24 B1 N D 162111.32-253533.9
16212-2536 BLM 4 Aa,Ab 2016 23 225 0.5 3.06 5.24 B0.5III N 162111.32-253533.9

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