Epsilon Piscium

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Epsilon Piscium[1]
Diagram showing star positions and boundaries of the Pisces constellation and its surroundings
Cercle rouge 100%.svg

Location of ε Piscium(circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Pisces
Right ascension 01h 02m 56.61s[2]
Declination +07° 53′ 24.5″[2]
Apparent magnitude (V) 4.28
Characteristics
Spectral type K0 III[3]
U−B color index +0.685
B−V color index +0.952[3]
Astrometry
Radial velocity (Rv) +7.47 ± 0.20[3] km/s
Proper motion (μ) RA: –80.17 ± 0.19[2] mas/yr
Dec.: +25.59 ± 0.14[2] mas/yr
Parallax (π) 17.94 ± 0.21[2] mas
Distance 182 ± 2 ly
(55.7 ± 0.7 pc)
Details
Mass 2.27[3] M
Radius 10.9 ± 0.8[4] R
Other designations
ε Piscium, ε Psc, Epsilon Psc, 71 Piscium, BD+07 153, FK5 36, GC 1258, HD 6186, HIP 4906, HR 294,PPM 144204, SAO 109627.

Epsilon Piscium (Epsilon Psc, ε Piscium, ε Psc) is the Bayer designation for a star approximately 182 light-years (56 parsecs) away from the Earth,[2] in the constellation Pisces. It is a yellow-orange star of the G9 III or K0 III spectral type, meaning it has a surface temperature around 5,000 Kelvin. This is a normal giant star, slightly cooler in surface temperature, yet brighter and larger than our Sun.[5] It is a suspected occultation double, with both stars having the same magnitude, separated by 0.25 arcsecond.[6]

Naming[edit]

In Chinese, 外屏 (Wài Píng), meaning Outer Fence, refers to an asterism consisting of refers to an asterism consisting of ε Piscium, δ Piscium, ζ Piscium, μ Piscium, ν Piscium, ξ Piscium and α Piscium. Consequently, ε Piscium itself is known as 外屏二 (Wài Píng èr, English: the Second Star of Outer Fence.)[7] In Japanese, 悠翔星 (Haruto-boshi), meaning "Soaring Forever Star," refers to the Japanese description of ε Piscium.

References[edit]

  1. ^ "Simbad Query Result". Simbad. Retrieved October 1, 2007. 
  2. ^ a b c d e f van Leeuwen, F. (2007). "HIP 4906". Hipparcos, the New Reduction. Retrieved 2010-08-25. 
  3. ^ a b c d Hekker, S. et al. (August 2006), "Precise radial velocities of giant stars. I. Stable stars", Astronomy and Astrophysics 454 (3): 943–949, arXiv:astro-ph/0604502, Bibcode:2006A&A...454..943H, doi:10.1051/0004-6361:20064946 
  4. ^ Nordgren, Tyler E. et al. (December 1999), "Stellar Angular Diameters of Late-Type Giants and Supergiants Measured with the Navy Prototype Optical Interferometer", The Astronomical Journal 118 (6): 3032–3038, Bibcode:1999AJ....118.3032N, doi:10.1086/301114 
  5. ^ "Hipparcos Star Catalog Entry". Retrieved October 1, 2007. 
  6. ^ "VizieR Detailed Page". Retrieved October 1, 2007. 
  7. ^ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 19 日