46 Ceti

46 Ceti
Observation data
Epoch J2000      Equinox J2000
Constellation Cetus
Right ascension 01h 25m 37.23270s[1]
Declination −14° 35′ 55.6414″[1]
Apparent magnitude (V) 4.907[2]
Characteristics
Spectral type K2+ III–IIIb CN0.5[3]
U−B color index +1.26[4]
B−V color index +1.231±0.009[5]
Astrometry
Radial velocity (Rv)−22.6±0.7[6] km/s
Proper motion (μ) RA: +44.670[1] mas/yr
Dec.: −17.216[1] mas/yr
Parallax (π)11.9466 ± 0.3140 mas[1]
Distance273 ± 7 ly
(84 ± 2 pc)
Absolute magnitude (MV)+0.19[5]
Details
Mass1.38[7] M☉
Radius19[8] R☉
Luminosity132[7] L☉
Surface gravity (log g)2.2[8] cgs
Temperature4,316±89[7] K
Metallicity [Fe/H]–0.32[8] dex
Rotational velocity (v sin i)0.0[8] km/s
Age4.17[7] Gyr
Other designations
BD−15°266, HD 8705, HIP 6670, HR 412, SAO 147803[9]
Database references
SIMBADdata

46 Ceti is a single[10] star in the equatorial constellation of Cetus. It is visible to the naked eye with an apparent visual magnitude of 4.9.[11] The distance to this star, as determined from an annual parallax shift of 11.9 mas,[1] is about 273 light years. It is moving closer to the Earth with a heliocentric radial velocity of −23 km/s,[6] and is expected to come as close as 184 light-years in 2.2 million years.[5]

At the age of about four billion years,[7] this is an evolved K-type giant star with a stellar classification of K2+ III–IIIb CN0.5.[3] The suffix notation CN0.5 indicates a mild overabundance of cyanogen in the stellar atmosphere. It has 1.38[7] times the mass of the Sun and has expanded to 19[8] times the Sun's radius. The star is radiating 132[7] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,316 K.[7] The projected rotational velocity is too small to be measured.[8]

  1. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference tycho2 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference perkins1989 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference EgUBV was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference RV was invoked but never defined (see the help page).
  7. ^ a b c d e f g h Cite error: The named reference Luck was invoked but never defined (see the help page).
  8. ^ a b c d e f Cite error: The named reference Massarotti was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference TYC2 was invoked but never defined (see the help page).