Phi1 Hydrae
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Hydra |
| Right ascension | 10h 32m 41.15960s |
| Declination | −16° 57′ 31.4112″ |
| Apparent magnitude (V) | 7.61 |
| Characteristics | |
| Evolutionary stage | subgiant |
| Spectral type | G2 V |
| Astrometry | |
| Radial velocity (Rv) | +15.8±0.3 km/s |
| Proper motion (μ) | RA: −20.964 mas/yr Dec.: −87.870 mas/yr |
| Parallax (π) | 12.3313±0.0315 mas |
| Distance | 264.5 ± 0.7 ly (81.1 ± 0.2 pc) |
| Absolute magnitude (MV) | +3.30 |
| Details | |
| Mass | 1.12 M☉ |
| Radius | 2.1 R☉ |
| Luminosity | 5.0 L☉ |
| Surface gravity (log g) | 3.86 cgs |
| Temperature | 6,023 K |
| Metallicity [Fe/H] | +0.15±0.05 dex |
| Age | 4.1 Gyr |
| Other designations | |
| φ1 Hya, 43 Hydrae, BD−16°3078, HD 91369, HIP 51614, SAO 156047 | |
| Database references | |
| SIMBAD | data |
Phi1 Hydrae, Latinized from φ1 Hydrae, is a yellow-hued star in the constellation Hydra. Its apparent magnitude is 7.61, making it too faint to be seen with the naked eye. Based upon an annual parallax shift of 12.3 mas as seen from Earth, it is located about 264 light-years from the Sun. It forms a triangle with the brighter φ2 Hydrae and φ3 Hydrae, between μ Hydrae and ν Hydrae.
Phi1 Hydrae is an ordinary G-type main-sequence star, having a Sun-like stellar classification of G2 V and a photospheric temperature only slightly higher than the sun. However, the mass is 34% greater than the Sun's, and it is radiating five times the Sun's luminosity. Phi1 Hydrae is moving further from the Sun with a radial velocity of +15.8 km/s.
References
- 1 2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
- 1 2 3 4 5 6 7 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- 1 2 Høg, E.; et al. (2000), "The Tycho-2 catalogue of the 2.5 million brightest stars", Astronomy and Astrophysics, 355: L27, Bibcode:2000A&A...355L..27H.
- 1 2 Houk, N.; Smith-Moore, M. (1988), "Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars", Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume 4, 4, Ann Arbor, MI, USA: Department of Astronomy, University of Michigan, Bibcode:1988mcts.book.....H.
- 1 2 de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
- 1 2 3 4 5 6 7 Stassun, Keivan G.; et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467.
- 1 2 Bensby, T.; Feltzing, S.; Oey, M. S. (2014), "Exploring the Milky Way stellar disk. A detailed elemental abundance study of 714 F and G dwarf stars in the solar neighbourhood", Astronomy & Astrophysics, 562 (A71): 28, arXiv:1309.2631, Bibcode:2014A&A...562A..71B, doi:10.1051/0004-6361/201322631, S2CID 118786105.
- ↑ "43 Hya". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-01-09.
