Lambda Crucis
From Infogalactic: the planetary knowledge core
 Location of λ Crucis (circled) |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Crux |
| Right ascension | 12h 54m 39.1821s[1] |
| Declination | −59° 08′ 48.124″[1] |
| Apparent magnitude (V) | 4.602[2] |
| Characteristics | |
| Spectral type | B4 Vne[2] |
| U−B color index | –0.60[3] |
| B−V color index | –0.15[3] |
| Variable type | Beta Cephei[4] |
| Astrometry | |
| Radial velocity (Rv) | 12[5] km/s |
| Proper motion (μ) | RA: –33.35[1] mas/yr Dec.: –14.75[1] mas/yr |
| Parallax (π) | 9.06 ± 0.60[1] mas |
| Distance | 360 ± 20 ly (110 ± 7 pc) |
| Absolute magnitude (MV) | –1.2[6] |
| Details | |
| Mass | 5.0 ± 0.1[7] M☉ |
| Luminosity | 790[6] L☉ |
| Surface gravity (log g) | 4.00[6] cgs |
| Temperature | 15,800[6] K |
| Rotational velocity (v sin i) | 341[8] km/s |
| Age | 53.3 ± 8.1[7] Myr |
| Other designations | |
Lambda Crucis (λ Crucis / λ Cru) is a star in the southern constellation Crux. The star is classified as a blue-white dwarf (spectral class B4 Vn). The apparent magnitude of λ Crucis is 4.6, but it is not stable. The star is a β Cephei-type variable, and its brightness varies with an amplitude of 0.02m period being 0.3951 days.[4] λ Crucis is located at 360 light-years from the Sun.
This star is a proper motion member of the Lower-Centaurus Crux sub-group in the Scorpius-Centaurus OB association, the nearest such association of co-moving massive stars to the Sun.[6]
References
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