HR 4138
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Carina |
| Right ascension | 10h 30m 20.12777s |
| Declination | −71° 59′ 34.0579″ |
| Apparent magnitude (V) | +4.72 |
| Characteristics | |
| Spectral type | A1V |
| B−V color index | +0.042±0.007 |
| Variable type | Rotating variable |
| Astrometry | |
| Radial velocity (Rv) | +7.5±0.4 km/s |
| Proper motion (μ) | RA: +27.896 mas/yr Dec.: −30.148 mas/yr |
| Parallax (π) | 11.7934±0.1025 mas |
| Distance | 277 ± 2 ly (84.8 ± 0.7 pc) |
| Absolute magnitude (MV) | 0.21 |
| Details | |
| Mass | 2.3±0.3 M☉ |
| Radius | 3.43±0.11 R☉ |
| Luminosity | 75±4 L☉ |
| Surface gravity (log g) | 3.73±0.07 cgs |
| Temperature | 9,161±137 K |
| Metallicity [Fe/H] | +0.06 dex |
| Rotation | likely 3.0 to 3.2 days |
| Rotational velocity (v sin i) | 12 km/s |
| Age | 403 Myr |
| Other designations | |
| K Car, CPD−71°1034, FK5 2842, GC 14457, HD 91375, HIP 51438, HR 4138, SAO 256722 | |
| Database references | |
| SIMBAD | data |
HR 4138 is a single star in the constellation Carina. It has the Bayer designation K Carinae, abbreviated K Car, while HR 4138 is the star's designation in the Bright Star Catalogue. It has a white hue and is faintly visible to the naked eye with an apparent visual magnitude of +4.72. This star is located at a distance of 277 light years based on parallax measurements, and it is drifting further away with a radial velocity of +7.5 km/s. Judging from its motion through space, it is a candidate member of the Sirius supercluster.