Mu Piscium

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Mu Piscium
Pisces IAU.svg
Red circle.svg

Location of μ Piscium (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Pisces
Right ascension 01h 30m 11.11444s[1]
Declination +06° 08′ 37.7577″[1]
Apparent magnitude (V) +4.84[2]
Spectral type K4 III[2]
B−V color index 1.38[2]
Radial velocity (Rv) +34.19[2] km/s
Proper motion (μ) RA: +292.00[1] mas/yr
Dec.: −45.95[1] mas/yr
Parallax (π) 10.73 ± 0.19[1] mas
Distance 304 ± 5 ly
(93 ± 2 pc)
Absolute magnitude (MV) −0.37[3]
Mass 1.25[2] M
Radius 37[4] R
Luminosity 186[2] L
Surface gravity (log g) 2.07[5] cgs
Temperature 4,126±27[2] K
Metallicity [Fe/H] −0.39[3] dex
Rotational velocity (v sin i) 1.0[6] km/s
Age 5.57[2] Gyr
Other designations
μ Psc, 98 Piscium, BD+05° 194, FK5 2099, HD 9138, HIP 7007, HR 434, SAO 109926, WDS J01302+0609A[7]
Database references

Mu Piscium (μ Piscium) is a solitary,[8] orange-hued star in the zodiac constellation of Pisces. It is visible to the naked eye with an apparent visual magnitude of 4.84.[2] Based upon an annual parallax shift of 10.73 mas as seen from Earth,[1] it is located about 304 light years from the Sun. Given this distance, it has a relatively high proper motion, advancing 296 mas per year across the sky.[9]

This is an evolved K-type giant star with a stellar classification of K4 III.[2] It has an estimated 1.25[2] times the mass of the Sun and, at the age of 5.6 billion years, has expanded to about 37[4] times the Sun's radius. From this enlarged photosphere, it is radiating 186[2] times the Sun's luminosity at an effective temperature of 4,126 K.[2] It has a magnitude 12.02 visual companion at an angular separation of 209.30 arc seconds along a position angle of 298°, as of 2012.[10]


In Chinese, 外屏 (Wài Píng), meaning Outer Fence, refers to an asterism consisting of refers to an asterism consisting of μ Piscium, δ Piscium, ε Piscium, ζ Piscium, ν Piscium, ξ Piscium and α Piscium. Consequently, μ Piscium itself is known as 外屏四 (Wài Píng sì, English: the Fourth Star of Outer Fence.)[11]


  1. ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752Freely accessible, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c d e f g h i j k l m Luck, R. Earle (September 2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal, 150 (3): 23, arXiv:1507.01466Freely accessible, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, 88. 
  3. ^ a b Ryon, Jenna; et al. (August 2009), "Comparing the Ca ii H and K Emission Lines in Red Giant Stars", Publications of the Astronomical Society of the Pacific, 121 (882): 842, arXiv:0907.3346Freely accessible, Bibcode:2009PASP..121..842R, doi:10.1086/605456. 
  4. ^ a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) – Third edition – Comments and statistics", Astronomy and Astrophysics, 367 (2): 521–524, arXiv:astro-ph/0012289Freely accessible, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451. 
  5. ^ Luck, R. Earle; Heiter, Ulrike (June 2007), "Giants in the Local Region", The Astronomical Journal, 133 (6): 2464–2486, Bibcode:2007AJ....133.2464L, doi:10.1086/513194. 
  6. ^ De Medeiros, J. R.; et al. (November 2000), "Rotation and lithium in single giant stars", Astronomy and Astrophysics, 363: 239–243, arXiv:astro-ph/0010273Freely accessible, Bibcode:2000A&A...363..239D. 
  7. ^ "mu. Psc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-07-25. 
  8. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878Freely accessible, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x. 
  9. ^ Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal, 129 (3): 1483–1522, arXiv:astro-ph/0412070Freely accessible, Bibcode:2005AJ....129.1483L, doi:10.1086/427854. 
  10. ^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122: 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920. 
  11. ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 19 日