Psi3 Piscium

Psi3 Piscium, which is Latinized from 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 7.5 mas as seen from Earth,[1] it is located about 435 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] The star is drifting closer to the Sun with a radial velocity of −7 km/s.[5]

For other stars with this Bayer designation, see ψ Piscium.
Psi3 Piscium
Location of ψ3 Piscium (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Pisces
Right ascension 01h 09m 49.20099s[1]
Declination +19° 39′ 30.2694″[1]
Apparent magnitude (V) 5.562[2]
Characteristics
Spectral type F9 IIIa[3] or G0 IV[4]
B−V color index −0.70[2]
Astrometry
Radial velocity (Rv)−6.6±2.1[5] km/s
Proper motion (μ) RA: −6.064[1] mas/yr
Dec.: +8.887[1] mas/yr
Parallax (π)7.5011 ± 0.1014[1] mas
Distance435 ± 6 ly
(133 ± 2 pc)
Absolute magnitude (MV)+3.38[6]
Details
Mass2.8[7] M☉
Radius10.29+1.20
−0.20[1] R☉
Luminosity95.5±1.6[1] L☉
Surface gravity (log g)4.16±0.17[8] cgs
Temperature6,554+143
−85[8] K
Metallicity [Fe/H]+0.88±0.21[8] dex
Rotation9 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
SIMBADdata

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[7] times the mass of the Sun and 10.3[1] times the Sun's radius. The star is radiating 95.5[1] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 6,554 K.[8]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. 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, doi:10.1888/0333750888/2862.
  3. 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. van Belle, G. T.; et al. (May 2008), "The Palomar Testbed Interferometer Calibrator Catalog", The Astrophysical Journal Supplement Series, 176 (1): 276–292, arXiv:0711.4194, Bibcode:2008ApJS..176..276V, doi:10.1086/526548, S2CID 10713221.
  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, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
  6. Reiners, A. (January 2006), "Rotation- and temperature-dependence of stellar latitudinal differential rotation", Astronomy and Astrophysics, 446 (1): 267–277, arXiv:astro-ph/0509399, Bibcode:2006A&A...446..267R, doi:10.1051/0004-6361:20053911, S2CID 8642707.
  7. 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. Behr, Bradford B. (November 2003), "Rotation Velocities of Red and Blue Field Horizontal-Branch Stars", The Astrophysical Journal Supplement Series, 149 (1): 101–121, arXiv:astro-ph/0307232, Bibcode:2003ApJS..149..101B, doi:10.1086/378352, S2CID 13371613.
  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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
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