Phecda

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Double star
Phecda (γ UMa Aa)
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Big Bear
Right ascension 11 h 53 m 49.85 s
declination + 53 ° 41 ′ 41.1 ″
Apparent brightness 2.41 mag
Typing
B − V color index +0.00 
U − B color index +0.02 
R − I index −0.03 
Spectral class A0 Ve / K0 V
Astrometry
Radial velocity (−11.9 ± 0.7) km / s
parallax (39.21 ± 0.40)  mas
distance (83.18 ± 0.85)  ly
(25.50 ± 0.26)  pc  
Visual absolute brightness M vis +0.38 mag
Proper movement 
Rec. Share: (107.68 ± 0.29)  mas / a
Dec. portion: (11.01 ± 0.29)  mas / a
Physical Properties
Dimensions (2.94 / 0.79)  M ☉
Luminosity

(65.26 / 0.40)  L ☉

Effective temperature (9520/4780)  K.
Other names
and catalog entries
Bayer name γ Ursae Majoris
Flamsteed name 64 Ursae Majoris
Bonn survey BD + 54 ° 1475
Bright Star Catalog HR 4554 [1]
Henry Draper Catalog HD 103287 [2]
Hipparcos catalog HIP 58001 [3]
SAO catalog SAO 28179 [4]
Tycho catalog TYC 3833-1034-1 [5]
2MASS catalog 2MASS J11534983 + 5341408 [6]
Other names FK5 447
annotation
  1. ↑ Calculated from apparent brightness and distance.

Phecda (spelling of the IAU ), Gamma Ursae Majoris, Phegda, Phekha, Pachd, Phacd or Phad , and Gamma Ursae Majoris , γ Ursae Majoris or γ UMa ( Bayer designation ), is about 83 light-years from the sun distant binary star in the constellation Ursa Major (Ursa Major) with a common apparent magnitude of 2.44 mag.

The main star of component A of the multiple star system γ Ursae Majoris (γ UMa Aa = Phekda) belongs to the spectral class A0 Ve and has about three times the mass of the sun. The component B is a star of the spectral class K2 V with about 0.8 solar masses. The name Phecda comes from the Arabic فخذ / faḫḏ  / 'thigh' back.

With four other of the seven bright car star Phecda belongs to the so-called group of bears , a moving pile of more than 100 stars, the star positions are widely dispersed.

See also

Web links

Individual evidence

  1. ↑ a b Hipparcos catalog (ESA 1997)
  2. ↑ a b c Bright Star Catalog
  3. ^ A b c d S. Eggl, E. Pilat-Lohinger, B. Funk, N. Georgakarakos, N. Haghighipour: Circumstellar habitable zones of binary-star systems in the solar neighborhood . In: Monthly Notices of the Royal Astronomical Society . 428, No. 4, 2012, p. 3104. arxiv : 1210.5411 . bibcode : 2013MNRAS.428.3104E . doi : 10.1093 / mnras / sts257 .
  4. ↑ Pulkovo radial velocities for 35493 HIP stars
  5. ↑ a b c Hipparcos, the New Reduction (van Leeuwen, 2007)
  6. ↑ a b List of IAU-approved Star Names as of 10 August 2018 .
  7. ↑ SIMBAD references