02321-1515 TOK 382 Aa,Ab
02h 32m 05.23s -15° 14' 40.6" P.A. 199.00 sep 0.6 mag 4.70,8.70 Sp F4IV dist. 26.7 pc (87.1 l.y.)
| Coord 2000 |
02321-1515 |
|
Discov num |
TOK 382 |
|
Comp |
Aa,Ab |
|
Coord arcsec 2000 |
02 32 05.23 -15 14 40.6 |
|
| Date first |
2013 |
|
Date last |
2020 |
|
Obs |
8 |
|
| Pa first |
342 |
|
Pa last |
199 |
|
P.A. Now (θ) |
199° |
|
| Sep first |
0.2 |
|
Sep last |
0.554 |
|
Sep. Now (ρ) |
0.554" |
|
| Mag pri |
4.70 |
|
Mag sec |
8.70 |
|
delta mag (ΔM) |
4 |
|
Spectral class |
F4IV (yellow-white) |
|
| Pri motion ra |
-074 |
|
Sec motion ra |
|
|
| Pri motion dec |
-122 |
|
Sec motion dec |
|
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
02321-1515 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
|
148445 |
02 32 05 -15 14 41 |
TOK 382 Aa,Ab |
2020 |
8 |
199 |
0.6 |
4.70 |
8.70 |
4.00 |
Y |
<=== |
| Show |
Sig Cet |
148445 |
02 32 05 -15 14 41 |
GWP 335 AB |
1999 |
5 |
252 |
345.6 |
4.79 |
8.77 |
3.98 |
|
|
Triple system
2 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Constellation |
Cetus |
|
SAO |
148445 |
|
HIP |
11783 |
|
Tycho2 |
5860-02587-1 |
|
| Gaia DR2 |
5145955421492456960 |
|
HD |
15798 |
|
HR |
740 |
|
GC |
3045 |
|
| BD |
BD-15 449 |
|
Bayer |
Sigma Ceti |
|
Bayer name |
Sig Cet |
|
Flamsteed |
76 Ceti |
|
| Flamsteed name |
76 Cet |
|
FK5 |
1071 |
|
Distance |
26.7 |
|
Distance ly |
87.1 |
|
| Bayer greek |
σ Cet |
|
ORBITAL ELEMENTS
| Period (P) | 21y | ± 1.9 |
Periastron (T) | 2015.632y | ± 0.062 |
Semi-major axis (a) | 0.366a | ± 0.012 |
| Eccentricity (e) | 0.858 | ± 0.016 |
Inclination (i) | 120.4° | ± 1.5 |
Longitude of periastron (ω) | 24.3° | ± 3 |
| Node (Ω) | 23.4° | ± 1.6 |
Notes | n | |
Reference | Tok2021c | |
| Equinox | 2000 | |
Last observation | 2021 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
198.5 |
0.561 |
| 2001 |
196.8 |
0.597 |
| 2002 |
195.2 |
0.621 |
| 2003 |
193.6 |
0.635 |
| 2004 |
192.2 |
0.641 |
| 2005 |
190.7 |
0.637 |
| 2006 |
189.2 |
0.625 |
| 2007 |
187.6 |
0.604 |
| 2008 |
185.9 |
0.575 |
| 2009 |
184.0 |
0.537 |
| 2010 |
181.8 |
0.490 |
| 2011 |
178.9 |
0.433 |
| 2012 |
175.2 |
0.364 |
| 2013 |
169.4 |
0.281 |
| 2014 |
157.9 |
0.183 |
| 2015 |
113.7 |
0.076 |
| 2016 |
246.0 |
0.068 |
| 2017 |
213.4 |
0.246 |
| 2018 |
206.8 |
0.363 |
| 2019 |
203.2 |
0.448 |
| 2020 |
200.6 |
0.513 |
| 2021 |
198.5 |
0.561 |
| 2022 |
196.8 |
0.597 |
| 2023 |
195.2 |
0.621 |
| 2024 |
193.6 |
0.635 |
| 2025 |
192.2 |
0.641 |
| 2026 |
190.7 |
0.637 |
| 2027 |
189.2 |
0.625 |
| 2028 |
187.6 |
0.604 |
| 2029 |
185.9 |
0.575 |
| 2030 |
184.0 |
0.537 |
|
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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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