16212-2536 NOR   1Aa1,2

 
 
16H 21M 11.32S -25 35' 33.9" P.A. 89 MAG 3.30,4.10 SP O9.5+B7 DIST. 213.68 PC (697.02 L.Y.)
 
 
Coord 2000
16212-2536
Discov num
NOR   1
Comp
Aa1,2
Coord arcsec 2000
16 21 11.32 -25 35 33.9
Date first
2010
Date last
2010
Obs
1
Pa first
89
Pa last
89
P.A. Now (θ)
89°
Sep first
0.0
Sep last
0.0
Sep. Now (ρ)
0"
Mag pri
3.30
Mag sec
4.10
delta mag (ΔM)
0.8
Spectral class
O9.5+B7 (blue/blue-white)
Pri motion ra
-011
Sec motion ra
Pri motion dec
-016
Sec motion dec
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
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
 
 
Constellation
Scorpius
SAO
184336
HIP
80112
Tycho2
6798-00540-1
HD
147165
HR
6084
GC
21982
ADS
10009
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
88.5
last precise sep
0.003
 
 
ORBITAL ELEMENTS
 
 
Period (P)33.01d± 0.002 Periastron (T)34889m (1954.4y)± 1 Semi-major axis (a)3.62m± 0.06
Eccentricity (e)0.322± 0.0012 Inclination (i)158.2°± 2.3 Longitude of periastron (ω)283°± 5
Node (Ω)104°± 5 Note Grade8(1=Definitive, 9=Indet.)
Equinox Last observation2006
label rho theta
2000-01-01 0.004 350.6
2001-01-01 0.004 337.0
2002-01-01 0.004 322.8
2003-01-01 0.004 307.1
2004-01-01 0.004 288.6
2005-01-01 0.003 264.5
2006-01-01 0.003 230.0
2007-01-01 0.002 182.0
2008-01-01 0.003 135.2
2009-01-01 0.003 101.3
2010-01-01 0.004 76.6
2011-01-01 0.004 56.8
2012-01-01 0.004 39.9
2013-01-01 0.004 24.7
2014-01-01 0.004 10.6
2015-01-01 0.004 357.1
2016-01-01 0.004 343.6
2017-01-01 0.004 329.8
2018-01-01 0.004 314.9
2019-01-01 0.004 298.0
2020-01-01 0.003 277.0
2021-01-01 0.003 248.4
2022-01-01 0.002 206.4
2023-01-01 0.002 156.2
2024-01-01 0.003 116.1
2025-01-01 0.003 87.7
2026-01-01 0.004 65.8
2027-01-01 0.004 47.7
2028-01-01 0.004 31.8
2029-01-01 0.004 17.3
2030-01-01 0.004 3.5

Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.

grafico orbita





grafico misure orbit6
Measures: green=micrometric, blue=interferometric, purple=photographic