Astronomy:Phi1 Hydrae
| Observation data 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[2] mas |
| 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 | |
| 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
- ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A XHIP record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 3.0 3.1 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.
- ↑ 4.0 4.1 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 (Ann Arbor, MI, USA: Department of Astronomy, University of Michigan) 4, Bibcode: 1988mcts.book.....H.
- ↑ 5.0 5.1 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, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 Stassun, Keivan G. et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S.
- ↑ 7.0 7.1 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, doi:10.1051/0004-6361/201322631, Bibcode: 2014A&A...562A..71B.
- ↑ "43 Hya". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=43+Hya.
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