75 Ceti

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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]
Distance
268 ± 2 ly
(82.2 ± 0.6 pc)
Absolute magnitude (MV)0.808[4]
Details
Gyr
HR 739, SAO 129959[8]
Database references
Exoplanet Archive
data

75 Ceti is a single

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

66 Ceti. Consequently, 75 Ceti itself is known as the Tenth Star of Circular Celestial Granary.[10]

This is an aging

luminosity of the Sun from its swollen photosphere at an effective temperature of 4,846 K.[7]

Planetary system

A planetary companion was discovered by

insolation than does Jupiter and, indeed, Earth.[12]

There may be additional periodic factors in the data, corresponding to m sin i of around 0.4 MJ and 1 MJ, at distances of ~0.9 AU and ~4 AU, where i is the orbital inclination and m is the planet's actual mass.[11] In 2023, the presence of a second, Jupiter-mass planet orbiting at 4 AU (75 Ceti c) was confirmed, which is more irradiated than Earth as well. The shorter period signal corresponding to a possible planet at 0.9 AU was found to be an alias of the true period of planet c.[6]

The 75 Ceti planetary system[6]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b ≥2.479+0.074
−0.090 MJ 		1.912+0.002
−0.003 		696.62+1.33
−1.69 		0.093+0.026
−0.042 		— —
c ≥0.912+0.088
−0.143 MJ 		3.929+0.058
−0.052 		2051.62+45.98
−40.47 		0.023+0.191
−0.003 		— —

References

  1. ^
    S2CID 244398875
    . Gaia DR3 record for this source at VizieR.
  2. ^
    S2CID 119257644
    .
  3. ^
    Bibcode:1999MSS...C05....0H
    .
  4. doi:10.1111/j.1365-2966.2007.11852.x
    .
  5. ^
    S2CID 119331707
    . A68.
  6. ^
    arXiv:2308.05343
    .
  7. ^
    doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
  8. ^ "75 Cet". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-08-01.
  9. S2CID 14878976
    .
  10. ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 11 日
  11. ^
    S2CID 119197073
    .
  12. ^ Square root of luminosity means that an Earth like planet would have to be >7 AU from the star.
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