| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Carina |
| Right ascension | 10h30m 20.12710s[1] |
| Declination | −71° 59′ 34.0602″[1] |
| Apparent magnitude (V) | +4.72[2] |
| Characteristics | |
| Spectral type | A2IV[3][4] or A1V[5] or A2III[6] |
| B−V color index | +0.042±0.007[2] |
| Astrometry | |
| Radial velocity (Rv) | +7.5±0.4[2] km/s |
| Proper motion (μ) | RA: +27.59[1] mas/yr Dec.: −30.73[1] mas/yr |
| Parallax (π) | 12.52 ± 0.17 mas[1] |
| Distance | 261 ± 4 ly (80 ± 1 pc) |
| Absolute magnitude (MV) | 0.21[2] |
| Details | |
| Mass | 2.10[7] M☉ |
| Radius | 3.45[8] R☉ |
| Luminosity | 75.06[2] L☉ |
| Surface gravity (log g) | 3.71[7] cgs |
| Temperature | 9,169±312[7] K |
| Metallicity [Fe/H] | +0.06[2] dex |
| Rotational velocity (v sin i) | 12[7] km/s |
| Age | 403[7] Myr |
| Other designations | |
K Car, CD−71°1034, FK5 2842, GC 14457, HD 91375, HIP 51438, HR 4138, SAO 256722[9] | |
| Database references | |
| SIMBAD | data |
HR 4138 is a single[10] star in the constellation Carina. It has the Bayer designation K Carinae,[11] 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.[2] This star is located at a distance of approximately 261 light years from the Sun based on parallax measurements,[1] and it is drifting further away with a radial velocity of +7.5 km/s.[2] Judging from its motion through space, it is a candidate member of the Sirius supercluster.[12]
This object is a superficially normal[4] A-type star. However, there is some disagreement over the evolutionary state of the star, as it has received luminosity classifications of a subgiant,[4] main sequence,[5] and a giant star.[6] Unexpectedly for an A-type star, a magnetic field has been detected.[4] It is around 400 million years old and has a low projected rotational velocity of 12 km/s.[7] The star displays an infrared excess,[10] indicating the presence of an orbiting debris disk with a black body temperature of 45 K at a separation of 314.2 AU from the host star.[8]
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