| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Carina |
| Right ascension | 10h 22m 58.14606s[1] |
| Declination | −66° 54′ 05.3903″[1] |
| Apparent magnitude (V) | 4.97[2] |
| Characteristics | |
| Spectral type | B8V[3] |
| B−Vcolor index | −0.128±0.003[2] |
| Astrometry | |
| Radial velocity (Rv) | +12.0±4.2[2] km/s |
| Proper motion (μ) | RA: −22.39[1]mas/yr Dec.: +11.48[1]mas/yr |
| Parallax (π) | 8.12±0.18 mas[1] |
| Distance | 402 ± 9 ly (123 ± 3 pc) |
| Absolute magnitude (MV) | −0.403[4] |
| Orbit[4] | |
| Period (P) | 15.727±0.001 d |
| Semi-major axis (a) | 52.66 R☉ |
| Eccentricity (e) | 0.044±0.014 |
| Inclination (i) | 54° |
| Periastronepoch (T) | 2,452,814.78±1.05 JD |
| Argument of periastron (ω) (secondary) | 138±25° |
| Semi-amplitude (K1) (primary) | 62.2±1.9 km/s |
| Semi-amplitude (K2) (secondary) | 76.0±1.5 km/s |
| Details | |
| A | |
| Mass | 4.3[4] M☉ |
| Luminosity | 288.39[2] L☉ |
| Rotational velocity (v sin i) | 7[4] km/s |
| Age | 18[4] Myr |
| B | |
| Mass | 3.5[4] M☉ |
| Other designations | |
| L Car,CPD−66°1243,FK5 2834,GC 14283,HD 90264,HIP 50847,HR 4089,SAO 250940[5] | |
| Database references | |
| SIMBAD | data |
HD 90264 is abinary star[4] system in the southernconstellation ofCarina. It has theBayer designation ofL Carinae, whileHD 90264 is the star's identifier in theHenry Draper catalogue. This system has a blue-white hue and is faintly visible to thenaked eye with anapparent visual magnitude of 4.97.[2] It is located at a distance of approximately 402 light years from theSun based onparallax, and is drifting further away with aradial velocity of around +12 km/s.[2] The system is a member of the Lower Centaurus Crux association of theSco-Cen Complex.[4]
This system was found to be a close double-linedspectroscopic binary in 1977, consisting of twoB-type main-sequence stars. It has a near circular orbit with aperiod of 15.727 days and asemimajor axis of 0.2449 AU. They appear to bespin-orbit synchronized. Both stars appear to be deficient in helium. The primary is ahelium variable star while the companion is amercury-manganese star. The variability of both stars aligns favorably with the orbital period.[4]
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