Nu Piscium

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Nu Piscium
Diagram showing star positions and boundaries of the Pisces constellation and its surroundings
Cercle rouge 100%.svg

Location of ν Piscium(circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Pisces
Right ascension 01h 41m 25.8943s
Declination +5° 29' 15.408"
Apparent magnitude (V) 4.448
Characteristics
Spectral type K3IIIb
U−B color index +1.56
B−V color index +1.36
Astrometry
Radial velocity (Rv) 0.4 km/s
Proper motion (μ) RA: -22.73 mas/yr
Dec.: 3.61 mas/yr
Parallax (π) 8.86 ± 0.77 mas
Distance 370 ± 30 ly
(113 ± 10 pc)
Details
Mass 1.9[1] M
Radius 34 ± 3[2] R
Other designations
ν Piscium, ν Psc, Nu Psc, 106 Piscium, BD+04°293, FK5 56, GC 2055, HD 10380, HIP 7884, HR 489, PPM 144883, SAO 110065[3]

Nu Piscium (Nu Psc, ν Piscium, ν Psc) is a star approximately 368 light years away from Earth, in the constellation Pisces. It is an orange star of the spectral type K3IIIb, meaning it possesses a surface temperature between 3,500 and 5,000 kelvins. It is a giant star, cooler in surface temperature than our Sun, yet larger and brighter.[4]

Nu Piscium was a latter designation of 51 Ceti.[5]

Naming[edit]

In Chinese, 外屏 (Wài Píng), meaning Outer Fence, refers to an asterism consisting of refers to an asterism consisting of ν Piscium, δ Piscium, ε Piscium, ζ Piscium, μ Piscium, ξ Piscium and α Piscium. Consequently, ν Piscium itself is known as 外屏五 (Wài Píng wu, English: the Fifth Star of Outer Fence.)[6]

References[edit]

  1. ^ Gondoin, P. (December 1999), "Evolution of X-ray activity and rotation on G-K giants", Astronomy and Astrophysics 352: 217–227, Bibcode:1999A&A...352..217G 
  2. ^ 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 
  3. ^ "Simbad Query Result". Simbad. Retrieved September 30, 2007. 
  4. ^ "Hipparcos Star Catalog Entry". Retrieved October 1, 2007. 
  5. ^ Wagman, M. (August 1987). "Flamsteed's Missing Stars". Journal for the History of Astronomy, Vol.18, NO. 3/AUG, P.209, 1987 18: 215. Bibcode:1987JHA....18..209W. 
  6. ^ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 19 日