52 Hydrae

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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
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
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. 1 2 3 4 5 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. 1 2 3 4 5 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, 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. 1 2 3 4 5 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. 1 2 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. 1 2 "l Hya". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved May 5, 2019.
  7. 1 2 3 4 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. 1 2 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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