Gliese 318
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pyxis |
| Right ascension | 08h 41m 32.50s |
| Declination | –32° 56′ 34.0″ |
| Apparent magnitude (V) | 11.85 |
| Characteristics | |
| Spectral type | DA5.5 |
| B−V color index | 0.22 |
| Astrometry | |
| Radial velocity (Rv) | +29.3 ± 2.9 km/s |
| Proper motion (μ) | RA: –1100 ± 9 mas/yr Dec.: 1340 ± 8 mas/yr |
| Parallax (π) | 113.63 ± 1.97 mas |
| Distance | 28.7 ± 0.5 ly (8.8 ± 0.2 pc) |
| Absolute magnitude (MV) | 12.14 ± 0.05[1] |
| Details | |
| Mass | 0.45 ± 0.01[1] M☉ |
| Luminosity | 0.0015[1] L☉ |
| Temperature | 9120 ± 190[1] K |
| Age | 550 ± 20 million[1] years |
| Other designations | |
Gliese 318 is a white dwarf in the constellation Pyxis. It is of spectral class DA5.5 and visual magnitude 11.85,[2] which lies 26 light years away.[3] The star was too faint to have had its parallax measured by the Hipparcos satellite. Earth-based measurement gives its parallax as 113.63 ± 1.97 milliarcseconds, yielding a distance of 28.7 ± 0.5 light-years.[1] It is around 45% as massive as the Sun but has only 0.15% its luminosity.[1]
References
- 1 2 3 4 5 6 7 Subasavage, John P.; Jao, Wei-Chun; Henry, Todd J.; Bergeron, P.; Dufour, P.; Ianna, Philip A.; Costa, Edgardo; Méndez, René A. (2009). "The Solar Neighborhood. XXI. Parallax Results from the CTIOPI 0.9 m Program: 20 New Members of the 25 Parsec White Dwarf Sample". The Astronomical Journal 137 (6): 4547–60. arXiv:0902.0627. Bibcode:2009AJ....137.4547S. doi:10.1088/0004-6256/137/6/4547.
- ↑ Pancino, E.; Altavilla, G.; Marinoni, S.; Cocozza, G.; Carrasco, J. M.; Bellazzini, M.; Bragaglia, A.; Federici, L.; Rossetti, E.; Cacciari, C.; Balaguer Núñez, L.; Castro, A.; Figueras, F.; Fusi Pecci, F.; Galleti, S.; Gebran, M.; Jordi, C.; Lardo, C.; Masana, E.; Monguió, M.; Montegriffo, P.; Ragaini, S.; Schuster, W.; Trager, S.; Vilardell, F.; Voss, H. (2012). "The Gaia spectrophotometric standard stars survey - I. Preliminary results". Monthly Notices of the Royal Astronomical Society 426 (3): 1767–81. arXiv:1207.6042. Bibcode:2012MNRAS.426.1767P. doi:10.1111/j.1365-2966.2012.21766.x.
- ↑ Sion, Edward M. (2009). "1.The White Dwarfs Within 20 Parsecs of the Sun: Kinematics and Statistics". The Astronomical Journal 138 (6): 1681. arXiv:0910.1288. Bibcode:2009AJ....138.1681S. doi:10.1088/0004-6256/138/6/1681.
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