16212-2536 H 4 121AB (Alniyat)

 
 
16h 21m 11.32s -25 35' 33.9" P.A. 273 sep 20.3 mag 2.89,8.42 Sp B0III+B8V dist. 213.68 pc (697.02 l.y.)
 
 
Coord 2000
16212-2536
Discov num
H 4 121
Comp
AB
Coord arcsec 2000
16 21 11.32 -25 35 33.9
Date first
1783
Date last
2016
Obs
44
Pa first
270
Pa last
273
P.A. Now (θ)
273°
Sep first
21.7
Sep last
20.3
Sep. Now (ρ)
20.3"
Mag pri
2.89
Mag sec
8.42
delta mag (ΔM)
5.53
Spectral class
B0III+B8V (blue-white/blue-white)
Pri motion ra
-010
Sec motion ra
Pri motion dec
-021
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
272.5
Precise sep
20.27
Common name
Alniyat
Meaning
support / shield of the heart
Other names
Al Niyat
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
272.5
last precise sep
20.27
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
16212-2536 H 4 121 AB 1999 40 273 20.0 2.89 8.42 B1 N D 162111.32-253533.9
16212-2536 H 4 121 AB 2011 40 271 19.8 2.89 8.42 B1 N D 162111.32-253533.9
16212-2536 H 4 121 AB 2013 42 273 20.0 2.89 8.42 B1 N D 162111.32-253533.9
16212-2536 H 4 121 AB 2016 44 273 20.3 2.89 8.42 B0III+B8V N 162111.32-253533.9

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