DL Crucis
From Infogalactic: the planetary knowledge core
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Crux |
| Right ascension | 12h 14m 16.9255s[1] |
| Declination | −64° 24′ 30.662″[1] |
| Apparent magnitude (V) | 6.261[2] (6.24 - 6.28[3]) |
| Characteristics | |
| Spectral type | B1.5Ia[4] |
| U−B color index | −0.73[5] |
| B−V color index | 0.12[5] |
| Variable type | Alpha Cygni[2] |
| Astrometry | |
| Radial velocity (Rv) | -10.50[6] km/s |
| Proper motion (μ) | RA: -5.62[1] mas/yr Dec.: 0.15[1] mas/yr |
| Parallax (π) | 0.68 ± 0.38[1] mas |
| Distance | approx. 5,000 ly (approx. 1,500 pc) |
| Absolute magnitude (MV) | −7.66[citation needed] |
| Details | |
| Mass | 30[4] M☉ |
| Radius | 40.7[7] R☉ |
| Luminosity | 242,000[7] L☉ |
| Surface gravity (log g) | 2.50[4] cgs |
| Temperature | 20,100[4] K |
| Rotation | 43[4] |
| Other designations | |
| Database references | |
| SIMBAD | data |
DL Crucis is a variable star in the constellation Crux. It is a blue-white supergiant of spectral type B1.5Ia, with a radius around 40 times and a mass 30 times that of the Sun. An Alpha Cygni variable, it ranges between apparent magnitudes 6.24 and 6.28 over a period of roughly 2 days 21 hours.[2] Hence it is just visible with the unaided eye in an outer suburban/rural transition sky.[8]
References
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