Delta Crateris
K-type giant star in the constellation Crater
From Wikipedia, the free encyclopedia
Delta Crateris (δ Crt, δ Crateris) is a solitary[8] star in the southern constellation of Crater. With an apparent visual magnitude of 3.56,[2] it is the brightest star[9] in this rather dim constellation. It has an annual parallax shift of 17.017 mas as measured from Earth,[1] indicating Delta Crateris lies at a distance of 192 ly from the Sun.
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Crater |
| Right ascension | 11h 19m 20.4473s[1] |
| Declination | â14° 46â² 42.743â³[1] |
| Apparent magnitude (V) | 3.56[2] |
| Characteristics | |
| Evolutionary stage | red clump[3] |
| Spectral type | K0 III[2] |
| BâV color index | 1.12[2] |
| Astrometry | |
| Radial velocity (Rv) | â4.94±0.21[4] km/s |
| Proper motion (μ) | RA: â122.958[1] mas/yr Dec.: +207.083[1] mas/yr |
| Parallax (Ï) | 17.017±0.1617 mas[1] |
| Distance | 192 ± 2 ly (58.8 ± 0.6 pc)[1] |
| Absolute magnitude (MV) | â0.321[3] |
| Details[5] | |
| Mass | 1.47 ± 0.2 Mâ |
| Radius | 20.14±0.48 Râ |
| Luminosity | 154.8±4.9 Lâ |
| Surface gravity (log g) | 2.00 ± 0.08 cgs |
| Temperature | 4,540 ± 40 K |
| Metallicity [Fe/H] | â0.43±0.10 dex |
| Age | 2.89[6] Gyr |
| Other designations | |
| δ Crt, 12 Crateris, BDâ13°3345, FK5 426, HD 98430, HIP 55282, HR 4382, SAO 156605.[7] | |
| Database references | |
| SIMBAD | data |
Characteristics
This is an evolved orange-hued giant star belonging to the spectral class K0 III. Delta Crateris is a member of the so-called red clump, indicating that it is generating energy through the thermonuclear fusion of helium at its core.[3] The star has an estimated 1.47 times the mass of the Sun but has expanded to 20 times the Sun's radius.[5]
It is around 2.89[6] billion years old with a rotation rate that is too small to measure; the projected rotational velocity is 0.0 km/s.[4] Delta Crateris is radiating 171.4±9.0 as much luminosity as the Sun[6] from its outer envelope at an effective temperature of 4,540 K.[5]
This star is occasionally called by the name Labrum, usually in an astrological context.[10]