Mal:Stjerneinfo/Phad

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Gamma Ursae Majoris

γ Ursae Majoris beliggenhet i Store bjørn (innringet)
Observasjonsdata
Epoke J2000
Rektascensjon11t 53m 49.84732s[1]
Deklinasjon+53° 41′ 41.1350″[1]
Tilsynelatende
størrelsesklasse
(V)
+2.438[2]
Karakteristikk
SpektralklasseA0 Ve[3]
Fargeindeks U–B+0.008[2]
Fargeindeks B–V–0.013[2]
Astrometri
Radialhastighet (Rv)−12.6[4] km/s
Egenbevegelse (μ)RA: +107.68[1] mas/år
DEK: +11.01[1] mas/år
Parallakse (π)39.21 ± 0.40 mas[1]
Avstand83,2 ± 0,8 ly
(25,5 ± 0,3 pc)
Detaljer
Masse2.62[3] M
Radius3.04 ± 0.08[5] R
Overflategravitasjon
(log g)
3.79[6]
Temperatur9 355[6] K
Andre betegnelser
Phad, Phecda, Phekda, Phegda, Phekha, Phacd, Fekda,[7] 64 Ursae Majoris, BD+54 1475, FK5 447, HD 103287, HIP 58001, HR 4554, SAO 28179.[8]

Referanser[rediger kilde]

  1. ^ a b c d e van Leeuwen, F. (November 2007), «Validation of the new Hipparcos reduction», Astronomy and Astrophysics 474 (2): 653–664, Bibcode 2007A&A...474..653V, DOI:10.1051/0004-6361:20078357 
  2. ^ a b c Oja, T., «UBV photometry of stars whose positions are accurately known. III», Astronomy and Astrophysics Supplement Series 65 (2): 405–4 
  3. ^ a b Shaya, Ed J.; Olling, Rob P. (januar 2011), «Very Wide Binaries and Other Comoving Stellar Companions: A Bayesian Analysis of the Hipparcos Catalogue», The Astrophysical Journal Supplement 192 (1): 2, Bibcode 2011ApJS..192....2S, DOI:10.1088/0067-0049/192/1/2 
  4. ^ Wielen, R. m. fl.. (1999), Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions, Astronomisches Rechen-Institut Heidelberg, Bibcode 1999VeARI..35....1W 
  5. ^ Fitzpatrick, E. L.; Massa, D. (March 2005), «Determining the Physical Properties of the B Stars. II. Calibration of Synthetic Photometry», The Astronomical Journal 129 (3): 1642–1662, arXiv:astro-ph/0412542, Bibcode 2005AJ....129.1642F, DOI:10.1086/427855 
  6. ^ a b King, Jeremy R. m. fl.. (April 2003), «Stellar Kinematic Groups. II. A Reexamination of the Membership, Activity, and Age of the Ursa Major Group», The Astronomical Journal 125 (4): 1980–2017, Bibcode 2003AJ....125.1980K, DOI:10.1086/368241 
  7. ^ Allen, Richard Hinckley (1899), Star-names and their meanings, G. E. Stechert, http://books.google.com/books?id=5xQuAAAAIAAJ&pg=PA438 
  8. ^ «PHECDA -- Emission-line Star», SIMBAD (Centre de Données astronomiques de Strasbourg), http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Gamma+Ursae+Majoris, besøkt 2011-12-29