Gamma Pyxidis
|
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pyxis |
| Right ascension | 08h 50m 31.9233s[1] |
| Declination | −27° 42′ 35.440″[1] |
| Apparent magnitude (V) | 4.026[2] |
| Characteristics | |
| Spectral type | K3III[2] |
| U−B color index | +1.368[3] |
| B−V color index | +1.284[3] |
| Astrometry | |
| Radial velocity (Rv) | 24.5 km/s |
| Proper motion (μ) | RA: −134.31[4] mas/yr Dec.: 87.89[4] mas/yr |
| Parallax (π) | 15.73 ± 0.17[4] mas |
| Distance | 207 ± 2 ly (63.6 ± 0.7 pc) |
| Details | |
| Luminosity | 178[5] L☉ |
| Surface gravity (log g) | 2.35[6] cgs |
| Temperature | 4,270[6] K |
| Metallicity [Fe/H] | -0.05[6] dex |
| Other designations | |
Gamma Pyxidis (Gamma Pyx, γ Pyxidis, γ Pyx) is a 4th magnitude star in the constellation Pyxis. It is classified as a giant star of composition similar to the Sun[7] with an estimated diameter 3.7 times that of the Sun.[8] It is located an estimated 207 light years from the Solar System.[4]
Gamma Pyxidis is moving through the Galaxy at a speed of 54.2 km/s relative to the Sun. Its projected Galactic orbit carries it between 21,300 and 30,700 light years from the center of the Galaxy.[9]
Naming
In Chinese, 天狗 (Tiān Gǒu), meaning Celestial Dog, refers to an asterism consisting of γ Pyxidis, e Velorum, f Velorum, β Pyxidis, α Pyxidis and δ Pyxidis. Consequently, γ Pyxidis itself is known as 天狗六 (Tiān Gǒu liù, English: the Sixth Star of Celestial Dog.)[10]
References
- 1 2 Perryman, M. A. C.; et al. (1997), "The Hipparcos Catalogue", Astronomy & Astrophysics, 323: L49–L52, Bibcode:1997A&A...323L..49P
- 1 2 "gam Pyx", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2009-06-03
- 1 2 Gutierrez-Moreno, Adelina; Moreno, Hugo (June 1968), "A photometric investigation of the Scorpio-Centaurus association", Astrophysical Journal Supplement, 15: 459, Bibcode:1968ApJS...15..459G, doi:10.1086/190168
- 1 2 3 4 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752
. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. - ↑ Mallik, Sushma V. (December 1999), "Lithium abundance and mass", Astronomy and Astrophysics, 352: 495–507, Bibcode:1999A&A...352..495M
- 1 2 3 Cenarro, A. J.; et al. (2007), "Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters", Monthly Notices of the Royal Astronomical Society, 374 (2): 664–690, arXiv:astro-ph/0611618, Bibcode:2007MNRAS.374..664C, doi:10.1111/j.1365-2966.2006.11196.x
- ↑ Keenan, Philip C.; Barnbaum, Cecilia (June 1999), "Revision and Calibration of MK Luminosity Classes for Cool Giants by HIPPARCOS Parallaxes", The Astrophysical Journal, 518 (2): 859–865, Bibcode:1999ApJ...518..859K, doi:10.1086/307311
- ↑ Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) – Third edition – Comments and statistics". Astronomy & Astrophysics. 367 (2): 521–24. arXiv:astro-ph/0012289. Bibcode:2001A&A...367..521P. doi:10.1051/0004-6361:20000451.
- ↑ Gamma Pyxidis (HIP 43409)
- ↑ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 17 日