Theta Ceti

Theta Ceti
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cetus
Right ascension 01h 24m 01.40328s[1]
Declination −08° 10′ 59.7392″[1]
Apparent magnitude (V) 3.60[2]
Characteristics
Spectral type K0 III[3]
B−V color index +1.07[2]
Astrometry
Radial velocity (Rv)+17.2±0.5[4] km/s
Proper motion (μ) RA: −76.226 mas/yr[1]
Dec.: −201.519 mas/yr[1]
Parallax (π)29.0339 ± 0.2198 mas[1]
Distance112.3 ± 0.9 ly
(34.4 ± 0.3 pc)
Absolute magnitude (MV)+0.89[5]
Details
Mass1.80[6] M☉
Radius10.37±0.09[7] R☉
Luminosity58.3±3.0[7] L☉
Surface gravity (log g)2.70[2] cgs
Temperature4,951±64[7] K
Metallicity [Fe/H]−0.13±0.15[2] dex
Rotational velocity (v sin i)2.60[2] km/s
Age2.20[6] Gyr
Other designations
θ Cet, 45 Cet, BD+08° 244, FK5 47, HD 8512, HIP 6537, HR 402, SAO 129274[8]
Database references
SIMBADdata

Theta Ceti, Latinized from θ Ceti, is a solitary,[9] orange-hued star in the equatorial constellation of Cetus. It is visible to the naked eye with an apparent visual magnitude of 3.60.[2] Based upon an annual parallax shift of 20m04 mas as seen from Earth,[1] it is located about 113 light-years from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.28 due to interstellar dust.[7]

With an age of about 2.2 billion years,[6] this is an evolved, K-type giant star with a stellar classification of K0 III.[3] It is a red clump[10] star on the horizontal branch,[2] which means it is generating energy through helium fusion at its core.[10] The star has an estimated 1.8[6] times the mass of the Sun and has expanded to 10 times the Sun's radius. It is radiating 58 times the solar luminosity from its photosphere at an effective temperature of 4,951 K.[7]

  1. ^ a b c d e Cite error: The named reference DR3 was invoked but never defined (see the help page).
  2. ^ a b c d e f g Cite error: The named reference Jones2011 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1999 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference Luck2015 was invoked but never defined (see the help page).
  7. ^ a b c d e Cite error: The named reference baines2018 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Joner2012 was invoked but never defined (see the help page).