| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Pisces |
| Right ascension | 23 20 20.58306 |
| Declination | +05° 22′ 52.7000″ |
| Apparent magnitude (V) | 5.069 |
| Characteristics | |
| Spectral type | K1 IV |
| U−B color index | +1.12 |
| B−V color index | +1.204±0.002 |
| Astrometry | |
| Radial velocity (Rv) | 40.46±0.18 km/s |
| Proper motion (μ) | RA: 78.829 mas/yr Dec.: −59.228 mas/yr |
| Parallax (π) | 9.5042 ± 0.1880 mas |
| Distance | 343 ± 7 ly (105 ± 2 pc) |
| Absolute magnitude (MV) | −0.56 |
| Details | |
| Mass | 1.37 M☉ |
| Radius | 22.06+1.38 −3.16 R☉ |
| Luminosity | 163±4 L☉ |
| Surface gravity (log g) | 1.81±0.28 cgs |
| Temperature | 4,314±80 K |
| Metallicity | −0.71±0.12 dex |
| Age | 4.58 Gyr |
| Other designations | |
| b Piscium, 7 Psc, BD+04°4997, FK5 3871, HD 220009, HIP 115227, HR 8878, SAO 128126 | |
| Database references | |
| SIMBAD | data |
7 Piscium is a single star in the zodiac constellation of Pisces, located around 343 light-years away from the Sun. It has the Bayer designation b Piscium; 7 Piscium is the Flamsteed designation. This object is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 5.07. It is moving further from the Earth with a heliocentric radial velocity of 40 km/s.
This is a metal-deficient giant star with a stellar classification of K1 IV. It is a red clump giant, which indicates it is on the horizontal branch and is generating energy through the fusion of helium at its core. The star is 4.58 billion years old with 1.37 times the mass of the Sun. It has 22 times the Sun's radius and is radiating 163 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,314 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. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
- ^ Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5". Michigan Spectral Survey. 5. Bibcode:1999MSS...C05....0H.
- Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J.
- ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- ^ Prugniel, Ph.; et al. (July 2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics, 531: A165, arXiv:1104.4952, Bibcode:2011A&A...531A.165P, doi:10.1051/0004-6361/201116769, S2CID 54940439.
- ^ Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal, 150 (3): 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114.
- ^ "7 Psc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-03-25.
- Eggleton, P. P.; Tokovinin, A. A. (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.
- Smiljanic, R.; Porto de Mello, G. F.; da Silva, L. (June 2007), "Abundance analysis of barium and mild barium stars", Astronomy & Astrophysics, 468 (2): 679–693, arXiv:astro-ph/0702421, Bibcode:2007A&A...468..679S, doi:10.1051/0004-6361:20065867, S2CID 5863942
- Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal, 539 (2): 732–741, arXiv:astro-ph/0003329, Bibcode:2000ApJ...539..732A, doi:10.1086/309278, S2CID 16673121.
