Phi1 Hydrae

Phi1 Hydrae, Latinized from φ1 Hydrae, is a yellow-hued star in the constellation Hydra. Its apparent magnitude is 7.61,[2] 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,[1] it is located about 266 light years from the Sun. It forms a triangle with the brighter φ2 Hydrae and φ3 Hydrae, between μ Hydrae and ν Hydrae.

For other stars with this Bayer designation, see φ Hydrae
Phi1 Hydrae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Hydra
Right ascension  10h 32m 41.16026s[1]
Declination −16° 57′ 31.4110″[1]
Apparent magnitude (V) 7.61[2]
Characteristics
Spectral type G2 V[3]
Astrometry
Radial velocity (Rv)+15.8±0.3[4] km/s
Proper motion (μ) RA: −20.964[5] mas/yr
Dec.: −87.082[5] mas/yr
Parallax (π)12.2814 ± 0.0688[5] mas
Distance266 ± 1 ly
(81.4 ± 0.5 pc)
Absolute magnitude (MV)+3.30[6]
Details[7]
Mass1.34 M☉
Radius2.1[5] R☉
Luminosity4.4[6] L☉
Surface gravity (log g)3.90±0.08 cgs
Temperature5,992±50 K
Metallicity [Fe/H]+0.15±0.05 dex
Age4.1 Gyr
Other designations
φ1 Hya, 43 Hydrae, BD−16° 3078, HD 91369, HIP 51614, SAO 156047[8]
Database references
SIMBADdata

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.[3] However, the mass is 34%[7] greater than the Sun, and it is radiating 4.4 times the Sun's luminosity.[6] Phi1 Hydrae is moving further from the Sun with a radial velocity of +15.8 km/s.[4]

References
  1. 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.
  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.
  3. 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.
  4. 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, A61.
  5. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  6. 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.
  7. Bensby, T.; et al. (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.
  8. "43 Hya". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-01-09.
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