| Observation data EpochJ2000 EquinoxJ2000 | |
|---|---|
| Constellation | Hydra[1] |
| Right ascension | 11h 08m 43.99011s[2] |
| Declination | −28° 04′ 50.3539″[2] |
| Apparent magnitude (V) | 5.43[3] |
| Characteristics | |
| Evolutionary stage | main sequence[4][2] |
| Spectral type | A1V[4] |
| U−Bcolor index | +0.06[5] |
| B−Vcolor index | +0.07[5] |
| Astrometry | |
| Radial velocity (Rv) | 16.0±7.4[6] km/s |
| Proper motion (μ) | RA: −69.211[2]mas/yr Dec.: −22.181[2]mas/yr |
| Parallax (π) | 18.3139±0.0752 mas[2] |
| Distance | 178.1 ± 0.7 ly (54.6 ± 0.2 pc) |
| Absolute magnitude (MV) | 1.61[3] |
| Details | |
| HD 96819 A | |
| Mass | 1.93[7] M☉ |
| Radius | 1.80[7] R☉ |
| Luminosity | 20.66[4] L☉ |
| Surface gravity (log g) | 4.22±0.08[3] cgs |
| Temperature | 8,954[4] K |
| Rotational velocity (v sin i) | 249[4] km/s |
| Age | 9±1[8] Myr |
| HD 96819 B | |
| Mass | 0.51[7] M☉ |
| Radius | 0.47[7] R☉ |
| Temperature | 3,792[7] K |
| Other designations | |
| NSV 5101,CD−27°7886,HD 96819,HIP 54477,HR 4334,SAO 179577[9] | |
| Database references | |
| SIMBAD | data |
HD 96819 is astar in theequatorialconstellation ofHydra. It was formerly known by its designation10 Crateris, but that name fell into disuse after constellations were redrawn and the star was no longer inCrater. It is visible to the naked eye as a dim, white-hued star with anapparent visual magnitude of 5.43.[3]Parallax measurements put it at a distance of 178 light years away from the Sun.[2] This is most likely (98.7% chance) a member of theTW Hydrae association.[8]
This is a rapidly rotatingA-type main-sequence star that is about double the mass of theSun. It emits 20.66 times as much energy as theSun, at aneffective temperature of 8,954 K. HD 96819 is currently 31.5% through its life as amain-sequence star: after that it will swell up as ared giant.[4] It is a young star of around nine million years age,[8] and is a suspectedvariable 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]
