Phad

Gamma Ursae Majoris
	; γがんま Ursae Majoris beliggenhet i Store bjørn (innringet)
	Observasjonsdata; Epoke J2000
Stjernebilde	Store bjørn
Rektascensjon	11t 53m 49.84732s
Deklinasjon	+53° 41′ 41.1350″
Tilsynelatende; størrelsesklasse (V)	+2.438
	Karakteristikk
Spektralklasse	A0 Ve
Fargeindeks U–B	+0.008
Fargeindeks B–V	–0.013
	Astrometri
Radialhastighet (Rv)	−12.6 km/s
Egenbevegelse (μみゅー)	RA: +107.68 mas/år; DEK: +11.01 mas/år
Parallakse (πぱい)	39.21 ± 0.40 mas
Avstand	83,2 ± 0,8 ly ; (25,5 ± 0,3 pc)
	Detaljer
Masse	2.62 M☉
Radius	3.04 ± 0.08 R☉
Overflategravitasjon; (log g)	3.79
Temperatur	9 355 K
Rotasjonshastighet (v sin i)	178 kilometer per sekund
	Andre betegnelser
	Phad, Phecda, Phekda, Phegda, Phekha, Phacd, Fekda, 64 Ursae Majoris, BD+54 1475, FK5 447, HD 103287, HIP 58001, HR 4554, SAO 28179.

Phad (γがんま UMa / γがんま Ursae Majoris / Gamma Ursae Majoris) er en stjerne i stjernebildet Store bjørn. Den er også kjent under navnene Phecda og Phekda. Navnene kommer fra det arabiske ordet فخذ fakhdh [faxð], (den store bjørns) «lår». Phad er en av stjernene i Karlsvognen.

Referanser

^ ^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
^ ^a ^b ^c Oja, T., «UBV photometry of stars whose positions are accurately known. III», Astronomy and Astrophysics Supplement Series 65 (2): 405–4
^ ^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
^ 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
^ 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
^ ^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
^ Allen, Richard Hinckley (1899), Star-names and their meanings, G. E. Stechert, http://books.google.com/books?id=5xQuAAAAIAAJ&pg=PA438
^ «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

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Autoritetsdata

[aaa474_2_653-1] 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

[aaass65_2_405-2] Oja, T., «UBV photometry of stars whose positions are accurately known. III», Astronomy and Astrophysics Supplement Series 65 (2): 405–4

[apjss192_1_2-3] 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

[scfs-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

[aj129_3_1642-5] 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

[aj125_4_1980-6] 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

[allen1899-7] Allen, Richard Hinckley (1899), Star-names and their meanings, G. E. Stechert, http://books.google.com/books?id=5xQuAAAAIAAJ&pg=PA438

[SIMBAD-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

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