Delta Crateris

δ Crateris

Location of δ Crateris (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Crater
Right ascension	11^h 19^m 20.4473^s[1]
Declination	−14° 46′ 42.7434″
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: −122.958[1] mas/yr Dec.: +207.083[1] mas/yr
Parallax (π)	17.017 ± 0.1617 mas[1]
Distance	192 ± 2 ly (58.8 ± 0.6 pc)[1]
Absolute magnitude (MV)	−0.321[4]
Details[5]
Mass	1.47 ± 0.2 M☉
Radius	20.14±0.48 R☉
Luminosity	154.8±4.9 L☉
Surface gravity (log g)	2.00 ± 0.08 cgs
Temperature	4,540 ± 40 K
Metallicity [Fe/H]	−0.43±0.10 dex
Age	2.89[6] Gyr
Other designations
δ Crt, 12 Crateris, BD−13° 3345, FK5 426, HD 98430, HIP 55282, HR 4382, SAO 156605.[7]
Database references
SIMBAD	data

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.

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.[4] 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.[3] 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]

References

1. 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. Mallik, Sushma V. (December 1999), "Lithium abundance and mass", Astronomy and Astrophysics, 352: 495–507, Bibcode:1999A&A...352..495M.
3. 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.
4. 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.
5. Reffert, Sabine; Bergmann, Christoph; Quirrenbach, Andreas; Trifonov, Trifon; Künstler, Andreas (2015-02-01). "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. 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. "del Crt". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-03-02.
8. 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.
9. Ridpath, Ian (2012), A Dictionary of Astronomy, OUP Oxford, p. 108, ISBN 978-0199609055.

External links

• Kaler, James B., "Delta Crateris", Stars, University of Illinois