Alpha Crateris

α Crateris
Location of α Crateris (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Crater
Right ascension 10h 59m 46.46486s[1]
Declination −18° 17′ 55.6172″[1]
Apparent magnitude (V) 4.07[2]
Characteristics
Spectral type K1 III[3]
Astrometry
Radial velocity (Rv)47.54 ± 0.16[4] km/s
Proper motion (μ) RA: −462.26 ± 0.24[1] mas/yr
Dec.: 129.49 ± 0.26[1] mas/yr
Parallax (π)23.1349 ± 0.3685 mas[5]
Distance141 ± 2 ly
(43.2 ± 0.7 pc)
Absolute magnitude (MV)+0.44[6]
Details
Mass1.81[7] M☉
Radius12.32[7] R☉
Luminosity66.0[7] L☉
Surface gravity (log g)2.53[7] cgs
Temperature4.691[7] K
Metallicity [Fe/H]+0.01[7] dex
Age2.06[7] Gyr
Other designations
7 Crt, NLTT 25942, LTT 4040, HD 95272, BD−17°3273, HIP 53740, HR 4287, FK5 1283, SAO 156375
Database references
SIMBADdata

Alpha Crateris (α Crateris, abbreviated Alpha Crt, α Crt), officially named Alkes /ˈælkɛs/,[8][9] is a star in the constellation of Crater. It is a cool giant star about 43.2 parsecs (141 ly) away.

  1. ^ a b c d Cite error: The named reference hipparcos was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference ducati was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference mk was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference rv was invoked but never defined (see the help page).
  5. ^ 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.
  6. ^ Cite error: The named reference Cardini2005 was invoked but never defined (see the help page).
  7. ^ a b c d e f g Cite error: The named reference reffert was invoked but never defined (see the help page).
  8. ^ George A. Davis (1944), 'The pronunciations, derivations, and meanings of a selected list of star names'. Popular Astronomy, Vol. 52, p.8–30
  9. ^ "Naming Stars". IAU.org. Retrieved 16 December 2017.