HD 96819

HD 96819
Observation data
Epoch J2000      Equinox J2000
Constellation Hydra
Right ascension 11h 08m 43.99954s[1]
Declination −28° 04′ 50.4127″[2]
Apparent magnitude (V) 5.43[3]
Characteristics
Spectral type A1V[4]
U−B color index +0.06[5]
B−V color index +0.07[5]
Astrometry
Radial velocity (Rv)16.0±7.4[6] km/s
Proper motion (μ) RA: −72.79[2] mas/yr
Dec.: −22.16[2] mas/yr
Parallax (π)17.97 ± 0.53 mas[2]
Distance182 ± 5 ly
(56 ± 2 pc)
Absolute magnitude (MV)1.61[3]
Details
HD 96819 A
Mass1.93[7] M☉
Radius1.9[3] R☉
Luminosity20.66[4] L☉
Surface gravity (log g)4.22±0.08[3] cgs
Temperature8,954[4] K
Rotational velocity (v sin i)249[4] km/s
Age9±1[8] Myr
HD 96819 B
Mass0.51[7] M☉
Other designations
NSV 5101, CD−27°7886, HD 96819, HIP 54477, HR 4334, SAO 179577[9]
Database references
SIMBADdata

HD 96819 is a star in the equatorial constellation of Hydra. It was formerly known by its designation 10 Crateris, but that name fell into disuse after constellations were redrawn and the star was no longer in Crater. It is visible to the naked eye as a dim, white-hued star with an apparent visual magnitude of 5.43.[3] Parallax measurements put it at a distance of 182 light years away from the Sun.[1] This is most likely (98.7% chance) a member of the TW Hydrae association.[8]

This is a rapidly rotating A-type main-sequence star that is about double the mass of the Sun. It emits 20.66 times as much energy as the Sun, at an effective temperature of 8,954 K. HD 96819 is currently 31.5% through its life as a main-sequence star: after that it will swell up as a red giant.[4] It is a young star of around nine million years age,[8] and is a suspected variable star.[10] Previously thought to be a single star,[11] in 2022 a companion star was discovered, making HD 96819 a binary star. The companion star has about half the mass of the Sun.[7]

  1. ^ a b Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference HIP was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference AllendePrieto was invoked but never defined (see the help page).
  4. ^ a b c d e Cite error: The named reference Zorec was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Johnson was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Kharchenko was invoked but never defined (see the help page).
  7. ^ a b c Waisberg, Idel; Klein, Ygal; Katz, Boaz (2023). "Binarity and beyond in a stars – I. Survey description and first results of VLTI/GRAVITY observations of VAST targets with high Gaia–Hipparcos accelerations". Monthly Notices of the Royal Astronomical Society. 521 (4): 5232–5254. arXiv:2206.05251. Bibcode:2023MNRAS.521.5232W. doi:10.1093/mnras/stad872.
  8. ^ a b c Cite error: The named reference Gagné2017 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Samus2017 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).