Nu Piscium
Star in the constellation Pisces
title: "Nu Piscium" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["k-type-giants", "barium-stars", "binary-stars", "pisces-(constellation)", "bayer-objects", "durchmusterung-objects", "flamsteed-objects", "hipparcos-objects", "henry-draper-catalogue-objects", "bright-star-catalogue-objects"] description: "Star in the constellation Pisces" topic_path: "science/astronomy" source: "https://en.wikipedia.org/wiki/Nu_Piscium" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0
::summary Star in the constellation Pisces ::
| name = Nu Piscium | image = | image=Pisces IAU.svg | alt= | float=center | width=250 | label= | position=right | mark=Red circle.svg | mark_width=10 | mark_link=ν Psc | x=290 | y=495 | caption=Location of ν Piscium (circled) | epoch = J2000.0 | equinox = J2000.0 (ICRS) | constell = Pisces | ra = | dec = | appmag_v = 4.44 | class = K3 IIIb | b-v = 1.37 | u-b = | variable = | radial_v = | prop_mo_ra = | prop_mo_dec = | pm_footnote = | parallax = 8.9275 | p_error = 0.1567 | parallax_footnote = | absmag_v = −0.78 | source = | component1 = ν Psc A | mass = 1.66 | radius = | luminosity = 380 | temperature = 4,154 | gravity = 1.91 | metal_fe = −0.16 | rotational_velocity = | age_gyr = 3.41 | names = | Simbad = nu+Psc Nu Piscium (ν Piscium) is an orange-hued binary star system in the zodiac constellation of Pisces. Prior to the formation of the modern constellation boundaries in 1930, it was designated 51 Ceti in the Cetus constellation. Nu Piscium is visible to the naked eye, having a combined apparent visual magnitude of 4.44. Based upon an annual parallax shift of 8.98 mas as seen from Earth, it is located about 365 light years from the Sun.
The primary, component A, is an evolved, K-type giant star with a stellar classification of K3 IIIb. It is a weak barium star, indicating that the atmosphere was previously enriched by accretion of s-process elements from what is now a white dwarf companion. The giant has 1.66 times the mass of the Sun and has expanded to about 35 times the Sun's radius. It is about 3.4 billion years old and is radiating 380 times the Sun's luminosity from its photosphere at an effective temperature of 4,154 K.
Naming
In Chinese, 外屏 (Wài Píng), meaning Outer Fence, refers to an asterism consisting of ν Piscium, δ Piscium, ε Piscium, ζ Piscium, μ Piscium, ξ Piscium and α Piscium. Consequently, the Chinese name for ν Piscium itself is 外屏五 (Wài Píng wu, .)
References
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| title=nu. Psc | access-date=2017-07-25 | postscript=. }}
References
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- {{cite XHIP. 7884
- (2021). "Angular Diameters and Fundamental Parameters of Forty-four Stars from the Navy Precision Optical Interferometer". The Astronomical Journal.
- {{cite DR3. 2562091860584132096
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