Delta Ursae Majoris

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δ Ursae Majoris
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ursa Major
Right ascension 12h 15m 25.6s
Declination +57° 01' 57"
Apparent magnitude (V) +3.32
Distance 81.4 ± 1.2 ly
(25.0 ± 0.4 pc)
Spectral type A3V
Other designations
Megrez, 69 Ursae Majoris,
HR 4660, HD 106591,
BD+57 1363, FK5 456,
HIP 59774, SAO 28315,
GC 16736, CCDM 12155+5702
Book plate by Sydney Hall depicting Ursa Major's stars

Delta Ursae Majoris (δ UMa / δ Ursae Majoris) is a star in the constellation Ursa Major. It has the traditional names Megrez, from the Arabic: المغرز‎ al-maghriz "the base [of the bear's tail]", and Kaffa.

Megrez has an apparent magnitude of +3.32 making it the dimmest of the seven stars in the Big Dipper. Located 81 light years away, it is of spectral type A3V and thus a bluish-white main sequence star. It has two faint companions, the 11th magnitude Delta Ursae Majoris B, 190 arcseconds away, and the 10th magnitude Delta Ursae Majoris C, 186 arcseconds away.

It is part of the Ursa Major moving group.

v • d • e
Stars of Ursa Major
ο (Muscida) • 2 • π1 • π2 • 5 • 6 • 7 • ρ • ι (Talitha Bor) • 10 • σ1 • κ (Talitha Aus) • σ2 • τ • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • θ (Alhaud) • 26 • 27 • 28 • υ • φ • 31 • 32 • λ (Tania Bor) • μ (Tania Aus) • 35 • 36 • 37 • 38 • 39 • 40 • 41 • 42 • 43 • 44 • ω • 46 • 47 • β (Merak) • 49 • α (Dubhe) • 51 • ψ • ξ • ν (Alula Bor) • 55 • 56 • 57 • 58 • 59 • 60 • 61 • 62 • χ • γ (Phecda) • 65 • 66 • 67 • 68 • δ (Megrez) • 70 • 71 • 72 • 73 • 74 • 75 • 76 • ε (Alioth) • 78 • ζ (Mizar) • 80 (Alcor) • 81 • 82 • 83 • 84 • η (Alkaid) • 86 • 55 Cam • 56 Cam • 57 Cam • 1 CVn • 14 LMi • 15 LMi • 47 LMi • 37 Lyn • 41 Lyn • 44 Lyn
List
Retrieved from "http://en.wikipedia.org/wiki/Delta_Ursae_Majoris"