20 Persei

20 Persei
Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension 02h 53m 42.61284s[1]
Declination +38° 20′ 14.9532″[1]
Apparent magnitude (V) 5.343[2]
Characteristics
Spectral type F6V[3]
U−B color index +0.03[4]
B−V color index +0.42[4]
Astrometry
Radial velocity (Rv)5.8 ± 2[5] km/s
Proper motion (μ) RA: 46.79[1] mas/yr
Dec.: -78.90[1] mas/yr
Parallax (π)14.15 ± 0.72[1] mas
Distance230 ± 10 ly
(71 ± 4 pc)
Orbit[6]
Period (P)31.633 ± 0.024 a (11,553.9 ± 8.7 d)
Semi-major axis (a)0.2224 ± 0.0011″
Eccentricity (e)0.7560 ±0.0023
Inclination (i)120.48 ± 0.20°
Longitude of the node (Ω)26.62 ± 0.24°
Periastron epoch (T)2450255.5 ± 12
Argument of periastron (ω)
(secondary)		265.54 ± 0.11°
Details
20 Per A
Mass1.5[7] M☉
20 Per A
Mass1.5[7] M☉
Other designations
BD+37° 655, HD 17904, HIP 13490, HR 855, SAO 55975
Database references
SIMBADdata

20 Persei is a binary star in the constellation Perseus. Its combined apparent magnitude is 5.343,[2] and it is located around 230 light-years (71 pc) distant, based on its parallax.[1]

20 Persei is a visual binary. The orbit of the two stars has been calculated from the secondary changing its position relative to the primary. The two orbit each other every 31.6 years, separated by 0.22 arcseconds.[6] The combined spectrum of 20 Persei matches that of an F-type main-sequence star,[3] and the two stars are thought to have equal masses, 1.5 times that of the Sun.[7] A ninth-magnitude star, designated 20 Persei C, may be associated with the pair.[8]

References

  1. 1 2 3 4 5 6 van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Archived from the original on 2016-04-02.
  2. 1 2 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.
  3. 1 2 Abt, Helmut A. (2009). "MK Classifications of Spectroscopic Binaries". The Astrophysical Journal Supplement Series. 180: 117. Bibcode:2009ApJS..180..117A. doi:10.1088/0067-0049/180/1/117.
  4. 1 2 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV data. Bibcode:1986EgUBV........0M.
  5. ↑ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Washington. Bibcode:1953GCRV..C......0W.
  6. 1 2 Muterspaugh, Matthew W.; Hartkopf, William I.; Lane, Benjamin F.; o'Connell, J.; Williamson, M.; Kulkarni, S. R.; Konacki, Maciej; Burke, Bernard F.; Colavita, M. M.; Shao, M.; Wiktorowicz, Sloane J. (2010). "The Phases Differential Astrometry Data Archive. Ii. Updated Binary Star Orbits and a Long Period Eclipsing Binary". The Astronomical Journal. 140 (6): 1623. arXiv:1010.4043. Bibcode:2010AJ....140.1623M. doi:10.1088/0004-6256/140/6/1623.
  7. 1 2 3 Heintz, W. D. (1981). "The Binary System of 20 Persei". Publications of the Astronomical Society of the Pacific. 93: 328. Bibcode:1981PASP...93..328H. doi:10.1086/130832.
  8. ↑ "* 20 Per C". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 20 June 2017.


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