Zeta Crateris

ζ Crateris
Location of ζ Crateris (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Crater
Right ascension 11h 44m 45.77615s[1]
Declination −18° 21′ 02.4298″[1]
Apparent magnitude (V) 4.740[2] (4.95 + 7.84)[3]
Characteristics
Spectral type G8 III[4]
U−B color index +0.724[2]
B−V color index +0.961[2]
Astrometry
Radial velocity (Rv)−4.10±0.33[5] km/s
Proper motion (μ) RA: +26.703 ± 0.520 [6] mas/yr
Dec.: −26.970 ± 0.346[6] mas/yr
Parallax (π)10.0112 ± 0.2795 mas[6]
Distance326 ± 9 ly
(100 ± 3 pc)
Absolute magnitude (MV)−0.66[7]
Details
Radius13[8] R☉
Luminosity157[9] L☉
Surface gravity (log g)2.60[7] cgs
Temperature4,992[7] K
Metallicity [Fe/H]+0.03[7] dex
Age251[7] Myr
Other designations
ζ Crt, 27 Crateris, BD−17° 3460, FK5 1301, HD 102070, HIP 57283, HR 4514, SAO 156869, WDS J11448-1821AB.[10]
Database references
SIMBADdata

Zeta Crateris (ζ Crateris) is a binary star[3] system in the southern constellation of Crater. Zeta Crateris appears to be about half-way between Epsilon Corvi to the southeast and Delta Crateris to the northwest, and marks the lower left corner of the rim of the bowl. Eta Crateris lies somewhat less than half of the way from Zeta Crateris to Gamma Corvi, the bright star above, (north) of Epsilon Corvi.

Zeta Crateris is a photometrically constant[11] system that is visible to the naked eye with an apparent visual magnitude of 4.740.[2] With an annual parallax shift of 9.24[1] mas as viewed from Earth, Zeta Crateris is located roughly 350 light years from the Sun. At that distance, the visual magnitude of the system is diminished by an extinction factor of 0.21 due to interstellar dust.[7]

The two components of this system had an angular separation of 0.20 arc seconds along a position angle of 22°, as of 1991.[12] The primary, component A, is a magnitude 4.95 evolved giant star with a stellar classification of G8 III.[4] It is a red clump star that is generating energy through the fusion of helium at its core.[13] Zeta Crateris has expanded to 13[8] times the radius of the Sun and shines with 157[9] times the Sun's luminosity. This energy is being radiated into outer space from the outer envelope at an effective temperature of 4,992 K.[7]

The secondary, component B, is a magnitude 7.84 star.[12] Zeta Crateris is a confirmed member of the Sirius supercluster[14] and is a candidate member of the Ursa Major Moving Group, a collection of stars that share a similar motion through space and may have at one time been members of the same open cluster.[15]

  1. ^ a b c Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference mnras172_667 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference houk1978 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  6. ^ a b c Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  7. ^ a b c d e f g Cite error: The named reference Takeda2008 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference PasinettiFracassini2001 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Choi1995 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference WDSC2014 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Alves2000 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Eggen1998 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference King2003 was invoked but never defined (see the help page).