Mu Ceti

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Mu Ceti A
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ceti
Right ascension 02h 44m 56.0s
Declination 10° 06′ 51″
Apparent magnitude (V) +4.27 [combined]
Spectral type F0 V[1]
Distance 84[1] ly
(? pc)
Absolute magnitude (MV) +2.17[2]
Mass 1.6[1] M
Radius 1.7[1] R
Luminosity 7.5[1] L
Temperature 7,141[2] K
Rotational velocity (v sin i) 45.1±2.3[2] km/s
Age 3.3[1] Gyr
Other designations
87 Ceti, HD 17094, HIP 12828, HR 123, SAO 110723, BD+09° 359
Database references

Mu Ceti (μ Ceti) is a binary system located in the constellation Cetus. Mu Ceti is a quadruple visual star system. The combined apparent magnitude of the system is +4.27, and is located 84 light years from the Sun.

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, Mu Ceti itself is known as the Fourth Star of Circular Celestial Granary.[3]

Mu Ceti A is an F0V subgiant, believed to be a Delta Scuti variable star.

The other components, Mu Ceti B, C and D are G3V, G2V and G6V respectively. The dimmer components were all discovered during occultations of Mu Ceti by the Moon. One of them orbits at a period of 1202 days.


  1. ^ a b c d e f Jim Kaler (Dec 21, 2007). "Mu Ceti". 
  2. ^ a b c Reiners, A. (January 2006), "Rotation- and temperature-dependence of stellar latitudinal differential rotation", Astronomy and Astrophysics, 446 (1): 267–277, Bibcode:2006A&A...446..267R, arXiv:astro-ph/0509399Freely accessible, doi:10.1051/0004-6361:20053911. 
  3. ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 11 日