Theta Piscium
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Pisces |
Right ascension | 23h 27m 58.0951s |
Declination | +6° 22′ 44.372″ |
Apparent magnitude (V) | 4.27[2] |
Characteristics | |
Spectral type | K1 III[2] |
U−B color index | +1.00 |
B−V color index | +1.062[2] |
Astrometry | |
Radial velocity (Rv) | +6.05 ± 0.19[2] km/s |
Proper motion (μ) | RA: -123.83 mas/yr Dec.: -43.26 mas/yr |
Parallax (π) | 20.54 ± 0.80 mas |
Distance | 159 ± 6 ly (49 ± 2 pc) |
Absolute magnitude (MV) | 0.83[2] |
Details | |
Mass | 1.54[2] M☉ |
Surface gravity (log g) | 2.70[3] cgs |
Temperature | 4,696[3] K |
Metallicity [Fe/H] | 0.06[3] dex |
Other designations | |
Database references | |
SIMBAD | data |
Theta Piscium (Theta Psc, θ Piscium, θ Psc) is a star approximately 159 light years away from Earth in the constellation Pisces. It is an orange-red star of the spectral type K1III, meaning it is a normal giant star with a surface temperature of 3,500 to 5,000 kelvins, and is brighter yet cooler than the Sun.[4]
Naming
In Chinese, 霹靂 (Pī Lì), meaning Thunderbolt, refers to an asterism consisting of refers to an asterism consisting of θ Piscium, β Piscium, γ Piscium, ι Piscium and ω Piscium. Consequently, θ Piscium itself is known as 霹靂三 (Pī Lì sān, English: the Third Star of Thunderbolt.)[5]
References
- ^ "Simbad Query Result". Simbad. Retrieved September 27, 2007.
- ^ a b c d e f Hekker, S.; et al. (August 2006), "Precise radial velocities of giant stars. I. Stable stars", Astronomy and Astrophysics, 454 (3): 943–949, arXiv:astro-ph/0604502, Bibcode:2006A&A...454..943H, doi:10.1051/0004-6361:20064946
- ^ a b c Liu, Y. J.; et al. (2007), "The abundances of nearby red clump giants", Monthly Notices of the Royal Astronomical Society, 382 (2): 553–66, Bibcode:2007MNRAS.382..553L, doi:10.1111/j.1365-2966.2007.11852.x.
- ^ ""Hipparcos Star Catalog Entry"". Retrieved September 27, 2007.
- ^ Template:Zh icon AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 8 日