Astronomy:52 Hydrae
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas |
| 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
- ↑ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ Mason, B. D. et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal 122 (6): 3466, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M, http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=B/wds, retrieved 2015-07-22.
- ↑ 4.0 4.1 4.2 4.3 4.4 Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics 537: A120, doi:10.1051/0004-6361/201117691, Bibcode: 2012A&A...537A.120Z.
- ↑ 5.0 5.1 Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode: 1982mcts.book.....H.
- ↑ 6.0 6.1 "l Hya". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=l+Hya.
- ↑ 7.0 7.1 7.2 7.3 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ 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, doi:10.1111/j.1365-2966.2011.19256.x, Bibcode: 2011MNRAS.416.3108R.
- ↑ 9.0 9.1 Tokovinin, A. (September 2008), "Comparative statistics and origin of triple and quadruple stars", Monthly Notices of the Royal Astronomical Society 389 (2): 925–938, doi:10.1111/j.1365-2966.2008.13613.x, Bibcode: 2008MNRAS.389..925T.
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