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Gamma Ursae Majoris: Wikis


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γ Ursae Majoris
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Major
Right ascension 11h 53m 49.8s
Declination +53° 41' 41"
Apparent magnitude (V) +2.41
Spectral type A0Ve SB
U-B color index 0.02
B-V color index 0.00
Variable type ?
Radial velocity (Rv) −13 km/s
Proper motion (μ) RA: 107.8 mas/yr
Dec.: 11.16 mas/yr
Parallax (π) 38.99 ± 0.68 mas
Distance 84 ± 1 ly
(25.6 ± 0.4 pc)
Absolute magnitude (MV) +0.36
Mass 2.7 M
Radius 3 R
Luminosity 72 L
Temperature 9500 K
Metallicity ?
Rotation ?
Age ? years
Other designations
Phad, Phecda, Phekda, Phegda, Phekha, Phacd, Fekda, 64 Ursae Majoris, HR 4554, HD 103287, BD+54 1475, FK5 447, HIP 58001, SAO 28179, GC 16268
Book plate by Sydney Hall depicting Ursa Major's stars

Gamma Ursae Majoris (γ UMa / γ Ursae Majoris) is a star in the constellation Ursa Major. It has the traditional name Phad, or Phecda, from the Arabic phrase الفخذ الدب al-faxð ad-dubb (the thigh of the bear).

It is more familiar to most observers in the northern hemisphere as the lower-left star forming the bowl of the Big Dipper, together with Dubhe (upper-right), Merak (lower-right) and Megrez (upper-left). Along with four other stars in this well-known asterism, Phecda forms an actual loose, open cluster of stars known as the Ursa Major moving group. Like the other stars in the cluster, it is an average main sequence star not unlike our Sun, although somewhat hotter, brighter and larger.

See also



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