Delta Crucis
Delta Crucis or δ Crucis, also identified as Imai (/ˈiːmaɪ/), is a star in the southern constellation of Crux, and is the faintest of the four bright stars that form the prominent asterism known as the Southern Cross. This star has an apparent magnitude of 2.8, and its proper name was adopted by the International Astronomical Union on 10 August 2018. Imai is a massive, hot and rapidly rotating star that is in the process of evolving into a giant, and is located at a distance of about 345 light-years (106 parsecs) from the Sun.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Crux |
| Right ascension | 12h 15m 08.71673s |
| Declination | −58° 44′ 56.1369″ |
| Apparent magnitude (V) | 2.78 - 2.84 |
| Characteristics | |
| Spectral type | B2 IV |
| U−B color index | −0.921 |
| B−V color index | −0.235 |
| Variable type | β Cep |
| Astrometry | |
| Radial velocity (Rv) | +22.2 km/s |
| Proper motion (μ) | RA: −35.81 mas/yr Dec.: −10.36 mas/yr |
| Parallax (π) | 9.45 ± 0.15 mas |
| Distance | 345 ± 5 ly (106 ± 2 pc) |
| Absolute magnitude (MV) | −3.2 |
| Details | |
| Mass | 8.9±0.1 M☉ |
| Radius | 8.0 R☉ |
| Luminosity | 10,000 L☉ |
| Surface gravity (log g) | 3.88 cgs |
| Temperature | 22,570±1,840 K |
| Rotational velocity (v sin i) | 210 km/s |
| Age | 18.1±3.2 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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