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75 Ceti

75 Ceti
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cetus
Right ascension 02h 32m 09.42241s[1]
Declination −01° 02′ 05.6166″[1]
Apparent magnitude (V) +5.36[2]
Characteristics
Spectral type K1 III[3]
B−V color index +1.004±0.002[2]
Astrometry
Radial velocity (Rv)−6.34±0.13[1] km/s
Proper motion (μ) RA: −23.268 mas/yr[1]
Dec.: −30.987 mas/yr[1]
Parallax (π)12.1717 ± 0.0962 mas[1]
Distance268 ± 2 ly
(82.2 ± 0.6 pc)
Absolute magnitude (MV)0.808[4]
Details
Mass1.85±0.05[5] M☉
Radius10.38+0.15
−0.26[6] R☉
Luminosity56.1±0.6[7] L☉
Surface gravity (log g)2.67±0.04[5] cgs
Temperature4,846+163
−128[7] K
Metallicity [Fe/H]0.00±0.06[5] dex
Age1.41±0.01[5] Gyr
Other designations
75 Cet, BD–01°353, GC 3043, HD 15779, HIP 11791, HR 739, SAO 129959[8]
Database references
SIMBADdata
Exoplanet Archivedata

75 Ceti is a single[9] star in the equatorial constellation of Cetus with at least two planets.[6] It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of +5.36.[2] The star is located 268 light-years (82 parsecs) distant from the Sun, based on parallax, but is drifting closer with a radial velocity of −6 km/s.[1]

In Chinese, 天囷 (Tiān Qūn), meaning Circular Celestial Granary, refers to an asterism consisting of α Ceti, κ1 Ceti, λ Ceti, μ Ceti, ξ1 Ceti, ξ2 Ceti, ν Ceti, γ Ceti, δ Ceti, 75 Ceti, 70 Ceti, 63 Ceti and 66 Ceti. Consequently, 75 Ceti itself is known as the Tenth Star of Circular Celestial Granary.[10]

This is an aging giant star with a stellar classification of K1 III,[3] having exhausted the supply of hydrogen at its core and expanded to 10.6[7] times the Sun's radius, or 0.05 AU. It is a red clump giant,[5] which indicates it is on the horizontal branch and is generating energy through helium fusion at the core. The star is 1.4[5] billion years old with 1.9[5] times the Sun's mass. It is radiating 56[7] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,846 K.[7]

  1. ^ a b c d e f Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Anderson2012 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 Liu2007 was invoked but never defined (see the help page).
  5. ^ a b c d e f g Cite error: The named reference Gallenne2018 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Teng2023 was invoked but never defined (see the help page).
  7. ^ a b c d e Cite error: The named reference GaiaDR2 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. ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 11 日
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