Delta Crateris (δ Crt, δ Crateris; traditional name: Labrum) is a solitary[9] star in the southern constellation of Crater. With an apparent visual magnitude of 3.56,[2] it is the brightest star[10] in this rather dim constellation. It has an annual parallax shift of 17.56[1] mas as measured from Earth, indicating Delta Crateris lies at a distance of 163 ± 4 light years from the Sun.
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Crater |
Right ascension | 11h 19m 20.44756s[1] |
Declination | −14° 46′ 42.7413″[1] |
Apparent magnitude (V) | 3.56[2] |
Characteristics | |
Spectral type | K0 III[2] |
B−V color index | 1.12[2] |
Astrometry | |
Radial velocity (Rv) | −4.94±0.21[3] km/s |
Proper motion (μ) | RA: −124.67[1] mas/yr Dec.: +207.59[1] mas/yr |
Parallax (π) | 20.0507 ± 0.5308 mas[4] |
Distance | 163 ± 4 ly (50 ± 1 pc) |
Absolute magnitude (MV) | −0.321[5] |
Details | |
Mass | 1.56[6] M☉ |
Radius | 22.44±0.28[7] R☉ |
Luminosity | 171.4±9.0[7] L☉ |
Surface gravity (log g) | 2.59[2] cgs |
Temperature | 4,510±15[6] K |
Metallicity [Fe/H] | −0.48[2] dex |
Rotational velocity (v sin i) | 0.0[3] km/s |
Age | 2.89[6] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
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.[5] The star has an estimated 1.56[6] times the mass of the Sun but has expanded to 22.44±0.28[7] times the Sun's radius.
The metallicity of the star – what astronomers term the abundance of elements other than hydrogen and helium – is only 33% that of the Sun.[2] 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.[3] Delta Crateris is radiating 171.4±9.0 as much luminosity as the Sun from its outer envelope at an effective temperature of 4,510±15 K.[6]
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