Sigma Cassiopeiae
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 23h59m00.5s |
| Declination | +55°45′18″ |
| Apparent magnitude (V) | +4.88 |
| Characteristics | |
| Spectral type | B1V |
| U−B color index | −0.82 |
| B−V color index | −0.07 |
| Variable type | none |
| Astrometry | |
| Radial velocity (Rv) | −13 km/s |
| Proper motion (μ) | RA: 9.26 mas/yr Dec.: −5.09 mas/yr |
| Parallax (π) | 2.14 ± 0.75 mas |
| Distance | 1520 ly (470 pc) |
| Absolute magnitude (MV) | −3.46 |
| Other designations | |
8 Cassiopeiae, HR 9071, HD 224572, BD+54°3082, HIP 118243, SAO 35947, GC 33257, ADS 17140, CCDM J23591+5546 | |
Sigma Cassiopeiae (σ Cas, σ Cassiopeiae) is a binary star in the constellation Cassiopeia. It is approximately 1520 light years from Earth and is a combined apparent magnitude of +4.88.
The primary component, σ Cassiopeiae A, is a blue-white B-type giant with an apparent magnitude of +5.0. Its companion, σ Cassiopeiae B, is a blue-white B-type main sequence dwarf, with an apparent magnitude of +7.1. The two stars are 3.1 arcseconds apart.
Naming
In Chinese, 螣蛇 (Téng Shé), meaning Flying Serpent, refers to an asterism consisting of σ Cassiopeiae, α Lacertae, 4 Lacertae, π2 Cygni, π1 Cygni, HD 206267, ε Cephei, β Lacertae, ρ Cassiopeiae, τ Cassiopeiae, AR Cassiopeiae, 9 Lacertae, 3 Andromedae, 7 Andromedae, 8 Andromedae, λ Andromedae, κ Andromedae, ι Andromedae, and ψ Andromedae. Consequently, σ Cassiopeiae itself is known as 螣蛇十一 (Téng Shé shíyī, English: the Eleventh Star of Flying Serpent)[3]
References
- ↑
- ↑ Jaques, Tony. Dictionary of Battles and Sieges. Greenwood Publishing Group, 2007. ISBN 0-313-33538-9, 9780313335389 Check
|isbn=value (help). - ↑ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 7 日
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