52 Hydrae

This article is about l Hydrae. 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

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]

  1. ^ a b c d e Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference WDSC2014 was invoked but never defined (see the help page).
  4. ^ a b c d e Cite error: The named reference zorec2012 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference houk1979 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Rizzuto2011 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Tokovinin2008 was invoked but never defined (see the help page).