Phi1 Hydrae
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Hydra[1] |
| Right ascension | 10h 32m 41.15960s[2] |
| Declination | −16° 57′ 31.4112″[2] |
| Apparent magnitude (V) | 7.61[3] |
| Characteristics | |
| Evolutionary stage | subgiant[2] |
| Spectral type | G2 V[4] |
| Astrometry | |
| Radial velocity (Rv) | +15.8±0.3[5] km/s |
| Proper motion (μ) | RA: −20.964[2] mas/yr Dec.: −87.870[2] mas/yr |
| Parallax (π) | 12.3313±0.0315 mas[2] |
| Distance | 264.5 ± 0.7 ly (81.1 ± 0.2 pc) |
| Absolute magnitude (MV) | +3.30[1] |
| Details | |
| Mass | 1.12[6] M☉ |
| Radius | 2.1[6] R☉ |
| Luminosity | 5.0[6] L☉ |
| Surface gravity (log g) | 3.86[6] cgs |
| Temperature | 6,023[6] K |
| Metallicity [Fe/H] | +0.15±0.05[7] dex |
| Age | 4.1[7] Gyr |
| Other designations | |
| φ1 Hya, 43 Hydrae, BD−16°3078, HD 91369, HIP 51614, SAO 156047[8] | |
| 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,[3] 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,[2] 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[4] and a photospheric temperature only slightly higher than the sun.[6] However, the mass is 34% greater than the Sun's, and it is radiating five times the Sun's luminosity.[6] Phi1 Hydrae is moving further from the Sun with a radial velocity of +15.8 km/s.[5]
References
[edit]- 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.
