16212-2536 NOR 1 Aa1,2
16h 21m 11.32s -25° 35' 33.9" P.A. 89.00 sep 0.0 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 |
88.5 |
|
P.A. Now (θ) |
88.5° |
|
| Sep first |
0.0 |
|
Sep last |
0.003 |
|
Sep. Now (ρ) |
0.003" |
|
| 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 |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
|
184336 |
16 21 11 -25 35 34 |
NOR 1 Aa1,2 |
2010 |
1 |
89 |
0.0 |
3.30 |
4.10 |
0.80 |
Y |
<=== |
| Show |
|
184336 |
16 21 11 -25 35 34 |
BLM 4 Aa,Ab |
2019 |
28 |
217 |
0.4 |
3.06 |
5.24 |
2.18 |
|
|
| Show |
Alniyat |
184336 |
16 21 11 -25 35 34 |
H 4 121 AB |
2019 |
45 |
269 |
20.5 |
2.89 |
8.42 |
5.53 |
|
|
Quadruple system
2 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Common name |
Alniyat |
|
Constellation |
Scorpius |
|
SAO |
184336 |
|
HIP |
80112 |
|
| Tycho2 |
6798-00540-1 |
|
Gaia DR2 |
6048602103659567488 |
|
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 |
|
| FK5 |
607 |
|
Distance |
213.68 |
|
Distance ly |
697.02 |
|
Bayer greek |
σ Sco |
|
| Meaning |
support / shield of the heart |
|
SUSPECTED ORBITAL ELEMENTS
| Identifier | 16212-2536 |
| coord_arcsec_2000 | 162111.32-253533.9 |
| 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 |
Notes | n | |
Reference | Nor2007 | |
| Equinox | | |
Last observation | 2006 | |
Grade | 8 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000-01-01 |
350.6 |
0.004 |
| 2001-01-01 |
337.0 |
0.004 |
| 2002-01-01 |
322.8 |
0.004 |
| 2003-01-01 |
307.1 |
0.004 |
| 2004-01-01 |
288.6 |
0.004 |
| 2005-01-01 |
264.5 |
0.003 |
| 2006-01-01 |
230.0 |
0.003 |
| 2007-01-01 |
182.0 |
0.002 |
| 2008-01-01 |
135.2 |
0.003 |
| 2009-01-01 |
101.3 |
0.003 |
| 2010-01-01 |
76.6 |
0.004 |
| 2011-01-01 |
56.8 |
0.004 |
| 2012-01-01 |
39.9 |
0.004 |
| 2013-01-01 |
24.7 |
0.004 |
| 2014-01-01 |
10.6 |
0.004 |
| 2015-01-01 |
357.1 |
0.004 |
| 2016-01-01 |
343.6 |
0.004 |
| 2017-01-01 |
329.8 |
0.004 |
| 2018-01-01 |
314.9 |
0.004 |
| 2019-01-01 |
298.0 |
0.004 |
| 2020-01-01 |
277.0 |
0.003 |
| 2021-01-01 |
248.4 |
0.003 |
| 2022-01-01 |
206.4 |
0.002 |
| 2023-01-01 |
156.2 |
0.002 |
| 2024-01-01 |
116.1 |
0.003 |
| 2025-01-01 |
87.7 |
0.003 |
| 2026-01-01 |
65.8 |
0.004 |
| 2027-01-01 |
47.7 |
0.004 |
| 2028-01-01 |
31.8 |
0.004 |
| 2029-01-01 |
17.3 |
0.004 |
| 2030-01-01 |
3.5 |
0.004 |
|
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Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
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Measures: green=micrometric, blue=interferometric, purple=photographic |
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