52 Hydrae
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 14h 28m 10.42638s[1] |
| Declination | −29° 29′ 29.8884″[1] |
| Apparent magnitude (V) | 4.97[2] (5.70 + 5.70 + 10.00)[3] |
| Characteristics | |
| Evolutionary stage | main sequence[4] |
| Spectral type | B7/8V[5] |
| B−V color index | −0.074±0.003[2] |
| Astrometry | |
| Radial velocity (Rv) | 5.4±3.8[2] km/s |
| Proper motion (μ) | RA: −25.23[1] mas/yr Dec.: −23.03[1] mas/yr |
| Parallax (π) | 8.29 ± 0.28 mas[1] |
| Distance | 390 ± 10 ly (121 ± 4 pc) |
| Absolute magnitude (MV) | −0.43[2] |
| Details | |
| 52 Hya A | |
| Mass | 3.82±0.06[4] M☉ |
| Luminosity | 310.5+24.5 −22.8[4] L☉ |
| Temperature | 12,853±89[4] K |
| Rotational velocity (v sin i) | 204[4] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
52 Hydrae is a triple star system[7] in the constellation Hydra. It has the Bayer designation l Hydrae; 52 Hydrae is the Flamsteed designation.[6] This system is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude of 4.97.[2] It is a probable (80% chance) member of the Sco OB2 moving group of stars,[8] and is moving away from the Earth with a heliocentric radial velocity of 5 km/s.[2]
The primary component is a binary system[7] consisting of two nearly equal components with an orbital period of around 15 years[9] and an angular separation of 0.1″.[7] It shows a combined stellar classification of B7/8V,[5] which matches a B-type main-sequence star. The third component is a magnitude 10.0 star at a separation of 4.2″[7] with a mass similar to the Sun. It is orbiting the inner pair with a period of around 3,900 years.[9]
References[edit]
- ^ a b c d e 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, S2CID 18759600.
- ^ a b c d e f 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, S2CID 119257644.
- ^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920, retrieved 2015-07-22.
- ^ a b c d e Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
- ^ a b Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1982mcts.book.....H.
- ^ a b "l Hya". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved May 5, 2019.
- ^ a b c d Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ Rizzuto, Aaron; et al. (October 2011), "Multidimensional Bayesian membership analysis of the Sco OB2 moving group", Monthly Notices of the Royal Astronomical Society, 416 (4): 3108–3117, arXiv:1106.2857, Bibcode:2011MNRAS.416.3108R, doi:10.1111/j.1365-2966.2011.19256.x, S2CID 54510608.
- ^ a b Tokovinin, A. (September 2008), "Comparative statistics and origin of triple and quadruple stars", Monthly Notices of the Royal Astronomical Society, 389 (2): 925–938, arXiv:0806.3263, Bibcode:2008MNRAS.389..925T, doi:10.1111/j.1365-2966.2008.13613.x, S2CID 16452670.