Astronomy:101 Piscium
| Observation data Epoch J2000.0 Equinox (celestial coordinates) | |
|---|---|
| Constellation | Pisces |
| Right ascension | 01h 35m 46.44226s[1] |
| Declination | +14° 39′ 41.1144″[1] |
| Apparent magnitude (V) | 6.23[2] |
| Characteristics | |
| Spectral type | B9.5 III[3] |
| U−B color index | −0.151[4] |
| B−V color index | −0.036±0.005[2] |
| Astrometry | |
| Radial velocity (Rv) | −10.10[5] km/s |
| Proper motion (μ) | RA: +3.287[1] mas/yr Dec.: −8.052[1] mas/yr |
| Parallax (π) | 2.3343 ± 0.0663[1] mas |
| Distance | 1,400 ± 40 ly (430 ± 10 pc) |
| Absolute magnitude (MV) | −2.07[2] |
| Details | |
| Mass | 4.53±0.51[6] M☉ |
| Radius | 3.6[7] R☉ |
| Luminosity | 1,037+523 −347[6] L☉ |
| Surface gravity (log g) | 2.907±0.028[8] cgs |
| Temperature | 10,471+49 −48[6] K |
| Rotational velocity (v sin i) | 246[6] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
101 Piscium is a star in the zodiac constellation of Pisces,[9] located around 1,400 light years away from the Sun. This appears as a dim, blue-white hued star near the lower limit of visibility to the naked eye at an apparent visual magnitude of 6.23.[2] It is a suspected variable star with the designation NSV 559;[10] 101 Piscium is the Flamsteed designation. The star is moving closer to the Earth with a heliocentric radial velocity of −10 km/s.[5]
This object has a stellar classification of B9.5 III,[3] matching a giant star that has consumed the hydrogen at its core and is evolving away from the main sequence.[6] It is spinning rapidly with a projected rotational velocity of 246[6] km/s, compared to a critical velocity of 270 km/s.[8] The star has 4.5[6] times the mass of the Sun and about 3.6[7] times the Sun's radius. It is radiating around 1,000[6] times the luminosity of the Sun from its photosphere at an effective temperature of 10,471 K.[6]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Cowley, A. et al. (April 1969). "A study of the bright A stars. I. A catalogue of spectral classifications". Astronomical Journal 74: 375–406. doi:10.1086/110819. Bibcode: 1969AJ.....74..375C.
- ↑ Gutierrez-Moreno, Adelina et al. (1966). "A System of photometric standards". Publications of the Department of Astronomy University of Chile (Publicaciones Universidad de Chile, Department de Astronomy) 1: 1–17. Bibcode: 1966PDAUC...1....1G.
- ↑ 5.0 5.1 Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 Zorec, J. et al. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. Bibcode: 2012A&A...537A.120Z.
- ↑ 7.0 7.1 Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (February 2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)". Astronomy and Astrophysics 367: 521–524. doi:10.1051/0004-6361:20000451. Bibcode: 2001A&A...367..521P.
- ↑ 8.0 8.1 Huang, W. et al. (2010). "A Stellar Rotation Census of B Stars: From ZAMS to TAMS". The Astrophysical Journal 722 (1): 605–619. doi:10.1088/0004-637X/722/1/605. Bibcode: 2010ApJ...722..605H.
- ↑ 9.0 9.1 "35 Psc". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=35+Psc.
- ↑ Samus, N. N. et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1 61 (1): 80–88. doi:10.1134/S1063772917010085. Bibcode: 2017ARep...61...80S.
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