Psi3 Piscium

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Psi3 Piscium
Pisces IAU.svg
Red circle.svg

Location of ψ3 Piscium (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Pisces
Right ascension 01h 09m 49.20102s[1]
Declination +19° 39′ 30.2636″[1]
Apparent magnitude (V) 5.562[2]
Spectral type F9 IIIa[3] or G0 IV[4]
B−V color index −0.70[2]
Radial velocity (Rv) −6.6±2.1[5] km/s
Proper motion (μ) RA: −6.04[1] mas/yr
Dec.: +8.75[1] mas/yr
Parallax (π) 8.66 ± 0.27[1] mas
Distance 380 ± 10 ly
(115 ± 4 pc)
Absolute magnitude (MV) +3.38[6]
Mass 2.8[7] M
Radius 11.2[7] R
Luminosity 86.7[7] L
Surface gravity (log g) 4.16±0.17[8] cgs
Temperature 6,554+143
[8] K
Metallicity [Fe/H] +0.88±0.21[8] dex
Rotation 9 d[7]
Rotational velocity (v sin i) 87.7±4.4[6] km/s
Other designations
ψ3 Psc, 81 Piscium, BD+18° 153, HD 6903, HIP 5454, HR 339, SAO 92283[9]
Database references

Psi3 Piscium (ψ3 Piscium) is a solitary,[10] yellow-hued star in the zodiac constellation of Pisces. It is faintly visible to the naked eye, having an apparent visual magnitude of 5.562.[2] Based upon an annual parallax shift of 8.66 mas as seen from Earth,[1] it is located about 380 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.33 due to interstellar dust.[4]

This F-type giant is a candidate horizontal branch[8] star with a stellar classification of F9 IIIa.[3] It is an X-ray source with a luminosity of (0.82±0.13)×1030 erg s−1 in the 0.3−10 keV band.[7] The projected rotational velocity is 87.7±4.4 km/s and it has an effective temperature of 6,273.[6] It has 2.8 times the mass of the Sun and 11.2 times the Sun's radius.[7]


  1. ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752Freely accessible, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c Høg, E.; et al. (March 2000), "The Tycho-2 catalogue of the 2.5 million brightest stars", Astronomy and Astrophysics, 355: L27−L30, Bibcode:2000A&A...355L..27H. 
  3. ^ a b Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373. 
  4. ^ a b van Belle, G. T.; et al. (May 2008), "The Palomar Testbed Interferometer Calibrator Catalog", The Astrophysical Journal Supplement Series, 176 (1): 276–292, Bibcode:2008ApJS..176..276V, arXiv:0711.4194Freely accessible, doi:10.1086/526548. 
  5. ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, Bibcode:2012A&A...546A..61D, arXiv:1208.3048Freely accessible, doi:10.1051/0004-6361/201219219, A61. 
  6. ^ 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. 
  7. ^ a b c d e f Gondoin, P. (December 2005), "The relation between X-ray activity and rotation in intermediate-mass G giants", Astronomy and Astrophysics, 444 (2): 531−538, Bibcode:2005A&A...444..531G, doi:10.1051/0004-6361:20053567. 
  8. ^ a b c d Behr, Bradford B. (November 2003), "Rotation Velocities of Red and Blue Field Horizontal-Branch Stars", The Astrophysical Journal Supplement Series, 149 (1): 101−121, Bibcode:2003ApJS..149..101B, arXiv:astro-ph/0307232Freely accessible, doi:10.1086/378352. 
  9. ^ "psi03 Psc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-07-22. 
  10. ^ 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, Bibcode:2008MNRAS.389..869E, arXiv:0806.2878Freely accessible, doi:10.1111/j.1365-2966.2008.13596.x.