Delta Ursae Majoris (δ Ursae Majoris, abbreviated Delta UMa, δ UMa), formally named Megrez /ˈmiːɡrɛz/, is a star in the northern circumpolar constellation of Ursa Major. With an apparent magnitude of +3.3, it is the dimmest of the seven stars in the Big Dipper asterism.
What is the proper name for Delta Ursae Majoris?
What is the proper name for Ursa Major?
the Great Bear Ursa Major, (Latin: “Greater Bear”) also called the Great Bear, in astronomy, a constellation of the northern sky, at about 10 hours 40 minutes right ascension and 56° north declination.
What kind of star is Megrez?
Megrez has the stellar classification A3V, indicating a hydrogen-fusing dwarf still on the main sequence, appearing white or blue-white in colour. With 1.4 solar radii, it is slightly larger than the Sun and has a mass 1.63 times solar.
What are two other names for Ursa Major?
Ursa Major is primarily known from the asterism of its main seven stars, which has been called the "Big Dipper," "the Wagon," "Charles's Wain," or "the Plough," among other names.
What kind of star is Alpha Ursae Majoris?
Dubhe, Alpha Ursae Majoris (α UMa) is a spectroscopic binary star with an apparent magnitude of 1.79, located at an approximate distance of 123 light years from Earth….Dubhe – Alpha Ursae Majoris.
| Spectral class | K0III + F0V |
|---|---|
| Dec.: -34.70 mas/yr | |
| Mass (α UMa A, α UMa B) | 4.25 M☉, 1.6 M☉ |
| Luminosity (α UMa A) | 316 L☉ |
| Radius | 30 R☉ |
•Sep 10, 2019
Which star is brighter Alpha Ursae Majoris or Epsilon Ursae Majoris?
Alioth is around 102 times brighter than our sun, yet the star is younger, having an estimated 300 million years. Alioth has a rotational velocity of around 33 kilometers / 20.5 miles per second. Alioth's magnetic field is 15 times weaker than α Canum Venaticorum, but it is still 100 times stronger than that of Earth.
Why is Ursa Major called Ursa Major?
The story behind the name: The constellation name, Ursa Major, means Big Bear. … The Greeks who named this constellation (later translated into the Latin name we use today) thought that the stars outlined the shape of a bear walking about on its clawed feet.
What type of star is Merak?
A1IVps Beta Ursae Majoris/Spectral type Merak is a bluish-white subgiant star of spectral type A1IVps. The star is located at around 79.7 light-years / 24.45 parsecs away from the Sun. Merak, also designated as Beta Ursae Majoris, is the fifth brightest star in the constellation of Ursa Major.
Is Megrez a main sequence star?
Like most other Dipper stars, Megrez is a run-of-the-mill A-class main sequence star, and there is nothing about Megrez that distinguishes it from most other stars of its spectral class that are in the prime of their lives, and converting hydrogen in their core into helium.