2 Persei

2 Persei
Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension 01h 52m 09.371s[1]
Declination +50° 47′ 34.06″[1]
Apparent magnitude (V) 5.70
Characteristics
Spectral type B9III[2] (B9IIIpHgMn[3])
Astrometry
Radial velocity (Rv)11.4±0.2[4] km/s
Proper motion (μ) RA: 18.72±0.31[1] mas/yr
Dec.: −28.63±0.22[1] mas/yr
Parallax (π)6.76 ± 0.34 mas
Distance480 ± 20 ly
(148 ± 7 pc)
Orbit[4]
Primary2 Persei A
Companion2 Persei B
Period (P)5.62698±0.00002 d
Eccentricity (e)0.024±0.011
Periastron epoch (T)2440281.3±0.4 JD
Argument of periastron (ω)
(primary)		208±24°
Semi-amplitude (K1)
(primary)		26.5±0.3 km/s
Details
Other designations
BD+50° 379, FK5 1052, HD 11291, HIP 8714, HR 536, SAO 22696[5]
Database references
SIMBADdata

2 Persei is a star in the constellation Perseus. Its apparent magnitude is 5.70. Located around 148 parsecs (480 ly) distant, it is a blue star of spectral type B9. In 1970 radial velocity measurements from spectrograms taken at David Dunlap Observatory indicated it was a spectroscopic binary.[6] Follow up observations led to the determination that it had a circular orbit with a period of 5.6 days.[4]

References

  1. 1 2 3 4 van Leeuwen, F. (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. Vizier catalog entry
  2. ↑ Sato, K.; Kuji, S. (1990). "MK classification and photometry of stars used for time and latitude observations at Mizusawa and Washington". Astronomy and Astrophysics Supplement Series. 85: 1069. Bibcode:1990A&AS...85.1069S.
  3. ↑ Hoffleit, Dorrit; Jaschek, Carlos (1991). "The Bright star catalogue". New Haven. Bibcode:1991bsc..book.....H.
  4. 1 2 3 Heard, J. F.; Krautter, A. (1975). "The orbit of the spectroscopic binary HD 11291". Journal of the Royal Astronomical Society of Canada. 69: 22–24. Bibcode:1975JRASC..69...22H.
  5. ↑ "2 Per". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-03-19.
  6. ↑ Hube, Douglas P. (1970). "The radial velocities of 335 late B-type stars". Memoirs of the Royal Astronomical Society. 72: 233–280. Bibcode:1970MmRAS..72..233H.


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