HD 96819

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HD 96819
Observation data
Epoch J2000      Equinox J2000
Constellation Hydra
Right ascension 11h 08m 43.99954s[1]
Declination −28° 04′ 50.4127″[1]
Apparent magnitude (V) 5.43[2]
Spectral type A1V[3]
U−B color index +0.06[4]
B−V color index +0.07[4]
Radial velocity (Rv)16.00 ± 7.4[5] km/s
Proper motion (μ) RA: −72.79[1] mas/yr
Dec.: −22.16[1] mas/yr
Parallax (π)17.97 ± 0.53[1] mas
Distance182 ± 5 ly
(56 ± 2 pc)
Absolute magnitude (MV)1.61[2]
Mass2.06 ± 0.03[3] M
Radius1.9[2] R
Luminosity20.66[3] L
Surface gravity (log g)4.22 ± 0.08[2] cgs
Temperature8954[3] K
Rotational velocity (v sin i)249[3] km/s
Other designations
CD−27° 7886, HD 96819, HIP 54477, HR 4334, SAO 179577[6]
Database references

HD 96819 is a variable star[6] in the 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. Its apparent magnitude is 5.43.[2] Parallax measurements by Hipparcos put it at

This is a quickly rotating A-type main-sequence star that is about 2 times as massive as the Sun. It emits 20.66 times as much energy as the Sun, at a surface 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.[3]


  1. ^ a b c d e van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  2. ^ a b c d e Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555–562. arXiv:astro-ph/9911002Freely accessible. Bibcode:1999A&A...352..555A. 
  3. ^ a b c d e f Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy & Astrophysics. 537: A120. arXiv:1201.2052Freely accessible. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. 
  4. ^ a b Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J. 
  5. ^ Kharchenko, N. V.; et al. (2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889. arXiv:0705.0878Freely accessible. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776. 
  6. ^ a b "HD 96819". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 22 August 2017.