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Delta Crateris

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Delta Crateris
Location of δ Crateris (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Crater
Right ascension 11h 19m 20.4473s[1]
Declination −14° 46′ 42.743″[1]
Apparent magnitude (V) 3.56[2]
Characteristics
Evolutionary stage red clump[3]
Spectral type K0 III[2]
B−V color index 1.12[2]
Astrometry
Radial velocity (Rv)−4.94±0.21[4] km/s
Proper motion (μ) RA: −122.958[1] mas/yr[1]
Dec.: +207.083 mas/yr[1]
Parallax (π)17.017±0.1617 mas[1]
Distance192 ± 2 ly
(58.8 ± 0.6 pc)[1]
Absolute magnitude (MV)−0.321[3]
Details[5]
Mass1.47±0.2 M☉
Radius20.14±0.48 R☉
Luminosity154.8±4.9 L☉
Surface gravity (log g)2.00±0.08 cgs
Temperature4,540±40 K
Metallicity [Fe/H]−0.43±0.10 dex
Age2.89[6] Gyr
Other designations
Labrum[7], δ Crt, 12 Crateris, BD−13°3345, FK5 426, HD 98430, HIP 55282, HR 4382, SAO 156605[8]
Database references
SIMBADdata

Delta Crateris is a solitary[9] star in the southern constellation of Crater. Its name is a Bayer designation that is Latinized from δ Crateris and abbreviated Delta Crt or δ Crt. 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 17.017 mas as measured from Earth,[1] indicating Delta Crateris lies at a distance of approximately 192 light-years (59 pc) from the Sun.

Characteristics

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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.[7]

References

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  1. 1 2 3 4 5 6 7 8 Vallenari, A.; et al. (Gaia collaboration) (2023), "Gaia Data Release 3. Summary of the content and survey properties", Astronomy and Astrophysics, 674: A1, arXiv:2208.00211, Bibcode:2023A&A...674A...1G, doi:10.1051/0004-6361/202243940, S2CID 244398875 Gaia DR3 record for this source at VizieR.
  2. 1 2 3 4 Mallik, Sushma V. (December 1999), "Lithium abundance and mass", Astronomy and Astrophysics, 352: 495–507, Bibcode:1999A&A...352..495M.
  3. 1 2 3 Soubiran, C.; et al. (2008), "Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants", Astronomy and Astrophysics, 480 (1): 91–101, arXiv:0712.1370, Bibcode:2008A&A...480...91S, doi:10.1051/0004-6361:20078788, S2CID 16602121.
  4. 1 2 Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209, S2CID 121883397.
  5. 1 2 3 Reffert, Sabine; et al. (February 2015), "Precise radial velocities of giant stars. VII. Occurrence rate of giant extrasolar planets as a function of mass and metallicity", Astronomy and Astrophysics, 574: A116, arXiv:1412.4634, Bibcode:2015A&A...574A.116R, doi:10.1051/0004-6361/201322360, ISSN 0004-6361.
  6. 1 2 3 Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114.
  7. 1 2 Robson, Vivian E. (1923), The Fixed Stars and Constellations in Astrology, p. 110.
  8. ↑ "del Crt", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2017-03-02.
  9. ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  10. ↑ Ridpath, Ian (2012), A Dictionary of Astronomy, OUP Oxford, p. 108, ISBN 978-0199609055.
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