HR 7955

HR 7955
Observation data
Epoch J2000      Equinox J2000
Constellation Cepheus
Right ascension 20h 45m 21.12879s[1]
Declination +57° 34′ 47.0080″[1]
Apparent magnitude (V) 4.51[2]
Characteristics
Spectral type F8IV-V + F9IV-V[2]
Astrometry
Radial velocity (Rv)-32.82 ± 0.04[3] km/s
Proper motion (μ) RA: -62.32[1] mas/yr
Dec.: -236.00[1] mas/yr
Parallax (π)36.64 ± 0.48[1] mas
Distance89 ± 1 ly
(27.3 ± 0.4 pc)
Orbit[2]
Period (P)1.4331 ± 0.0003 yr
Semi-major axis (a)0.065 ± 0.001″
Eccentricity (e)0.551 ± 0.004
Inclination (i)24.53 ± 3.13°
Longitude of the node (Ω)325.21 ± 1.05°
Periastron epoch (T)B 1996.335 ± 0.0017
Argument of periastron (ω)
(secondary)		68.86 ± 0.76°
Details[2]
HR 7955 A
Mass1.071 ± 0.037 M☉
HR 7955 B
Mass1.047 ± 0.037 M☉
Other designations
BD+57° 2240, FK5 782, GJ 9706, HD 198084, HIP 102431, HR 7955, SAO 32862[4]
Database references
SIMBADdata

HR 7955 is a binary star in the constellation Cepheus. Its apparent magnitude is 4.51.[2] It is located 89 light-years (27.3 parsecs) away from the Solar System, based on parallax.[1] The two components, both late F-type main-sequence stars or subgiant stars, orbit each other every 1.4331 years.[2]

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.
  2. 1 2 3 4 5 6 Farrington, C. D; Ten Brummelaar, T. A; Mason, B. D; Hartkopf, W. I; McAlister, H. A; Raghavan, D; Turner, N. H; Sturmann, L; Sturmann, J; Ridgway, S. T (2010). "Separated Fringe Packet Observations with the CHARA Array. I. Methods and New Orbits for χ Draconis, HD 184467, and HD 198084". The Astronomical Journal. 139 (6): 2308. Bibcode:2010AJ....139.2308F. doi:10.1088/0004-6256/139/6/2308.
  3. ↑ Pourbaix, D.; et al. (2004). "SB9: The ninth catalogue of spectroscopic binary orbits". Astronomy and Astrophysics. 424 (2): 727. arXiv:astro-ph/0406573. Bibcode:2004A&A...424..727P. doi:10.1051/0004-6361:20041213.
  4. ↑ "HR 7955". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 6 September 2012.
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