Location of ψ Piscium (circled) | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Pisces |
| Right ascension | 01 09 49.20099 |
| Declination | +19° 39′ 30.2694″ |
| Apparent magnitude (V) | 5.562 |
| Characteristics | |
| Spectral type | F9 IIIa or G0 IV |
| B−V color index | −0.70 |
| Astrometry | |
| Radial velocity (Rv) | −6.6±2.1 km/s |
| Proper motion (μ) | RA: −6.064 mas/yr Dec.: +8.887 mas/yr |
| Parallax (π) | 7.5011 ± 0.1014 mas |
| Distance | 435 ± 6 ly (133 ± 2 pc) |
| Absolute magnitude (MV) | +3.38 |
| Details | |
| Mass | 2.8 M☉ |
| Radius | 10.29+1.20 −0.20 R☉ |
| Luminosity | 95.5±1.6 L☉ |
| Surface gravity (log g) | 4.16±0.17 cgs |
| Temperature | 6,554+143 −85 K |
| Metallicity | +0.88±0.21 dex |
| Rotation | 9 d |
| Rotational velocity (v sin i) | 87.7±4.4 km/s |
| Other designations | |
| ψ Psc, 81 Piscium, BD+18° 153, HD 6903, HIP 5454, HR 339, SAO 92283 | |
| Database references | |
| SIMBAD | data |
Psi Piscium, which is Latinized from ψ Piscium, is a solitary, 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. Based upon an annual parallax shift of 7.5 mas as seen from Earth, 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. The star is drifting closer to the Sun with a radial velocity of −7 km/s.
This F-type giant is a candidate horizontal branch star with a stellar classification of F9 IIIa. It is an X-ray source with a luminosity of (0.82±0.13)×10 erg s in the 0.3−10 keV band. The projected rotational velocity is 87.7±4.4 km/s and it has an effective temperature of 6,273. It has 2.8 times the mass of the Sun and 10.3 times the Sun's radius. The star is radiating 95.5 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 6,554 K.
References
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ Reiners, Ansgar (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
- ^ 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.
- ^ 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.
- "psi03 Psc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-07-22.
{{cite web}}: CS1 maint: postscript (link) - 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.
