52 Hydrae

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]

This article is about l Hydrae. It is not to be confused with I Hydrae, ι (iota) Hydrae, or λ (lambda) Hydrae.
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]
Distance390 ± 10 ly
(121 ± 4 pc)
Absolute magnitude (MV)−0.43[2]
Details
52 Hya A
Mass3.82±0.06[4] M☉
Luminosity310.5+24.5
−22.8[4] L☉
Temperature12,853±89[4] K
Rotational velocity (v sin i)204[4] km/s
Other designations
l Hya, 52 Hya, CD−28°10712, FK5 532, HD 126769, HIP 70753, HR 5407, SAO 182570, ADS 9270, WDS J14282-2929[6]
Database references
SIMBADdata

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. 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.
  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, S2CID 119257644.
  3. 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.
  4. 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.
  5. 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.
  6. "l Hya". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved May 5, 2019.
  7. 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.
  8. 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.
  9. 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.
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