Gamma Ursae Majoris - Citizendia

**γ Ursae Majoris**
Observation data Epoch J2000
Constellation (pronunciation)	Ursa Major
Right ascension	11^h 53^m 49. In Astronomy, an epoch is a moment in time used as a reference for the Orbital elements of a Celestial body. In common usage a constellation is a group of celestial bodies that are connected together in some arrangement typically stars to form a visible figure or picture Each culture has its own Constellations usually based on Mythology. Ursa Major ( is a Constellation visible throughout the year in most of the northern hemisphere Right ascension (abbrev RA; symbol α) is the Astronomical term for one of the two Coordinates of a point on the Celestial sphere 8^s
Declination	+53° 41' 41"
Apparent magnitude (V)	+2. In Astronomy, declination (abbrev dec or δ) is one of the two coordinates of the Equatorial coordinate system, the other being either The apparent magnitude ( m) of a celestial body is a measure of its Brightness as seen by an observer on Earth, normalized to the value 41
Characteristics
Spectral type	A0Ve SB
U-B color index	0. In Astronomy, stellar classification is a classification of Stars based initially on photospheric temperature and its associated Spectral characteristics In Astronomy, the color index is a simple numerical expression that determines the color of an object which in the case of a Star gives its Temperature 02
B-V color index	0. In Astronomy, the color index is a simple numerical expression that determines the color of an object which in the case of a Star gives its Temperature 00
Variable type	?
Astrometry
Radial velocity (R_v)	−13 km/s
Proper motion (μ)	RA: 107. For the astronomical object see Variable star. Variable Star is a 2006 novel written by Spider Robinson Astrometry is the branch of Astronomy that relates to precise measurements and explanations of the positions and movements of Stars and other celestial bodies Radial velocity is the Velocity of an object in the direction of the line of sight (i The proper motion of a Star is the measurement of its change in position in the sky over time after Improper motions are accounted for 8 mas/yr Dec. A minute of arc, arcminute, or MOA is a unit of angular measurement, equal to one sixtieth (1/60 of one degree. A year (from Old English gēr) is the time between two recurrences of an event related to the Orbit of the Earth around the Sun : 11. 16 mas/yr
Parallax (π)	38. A minute of arc, arcminute, or MOA is a unit of angular measurement, equal to one sixtieth (1/60 of one degree. A year (from Old English gēr) is the time between two recurrences of an event related to the Orbit of the Earth around the Sun Parallax is an apparent displacement or difference of orientation of an object viewed along two different lines of sight and is measured by the angle or semi-angle of inclination between 99 ± 0. 68 mas
Distance	84 ± 1 ly (25. A minute of arc, arcminute, or MOA is a unit of angular measurement, equal to one sixtieth (1/60 of one degree. Distance is a numerical description of how far apart objects are A light-year or light year (symbol ly) is a unit of Length, equal to just under ten trillion Kilometres As defined by 6 ± 0. 4 pc)
Absolute magnitude (M_V)	+0. History The first direct measurements of an object at interstellar distances were undertaken by German Astronomer Friedrich Wilhelm Bessel in 1838 In Astronomy, absolute magnitude (also known as absolute visual magnitude) is the Apparent magnitude an object would have if it were at a standard 36
Details
Mass	2. Mass is a fundamental concept in Physics, roughly corresponding to the Intuitive idea of how much Matter there is in an object 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

Gamma Ursae Majoris (γ UMa / γ Ursae Majoris) is a star in the constellation Ursa Major. The solar mass is a standard way to express Mass in Astronomy, used to describe the masses of other Stars and galaxies. Remote Authentication Dial In User Service ( RADIUS) is a networking protocol that provides centralized access authorization and accounting management for people or computers In Astronomy, the solar radius is a unit of Length used to express the size of Stars It is equal to the current radius of the Sun. Luminosity has different meanings in several different fields of science The solar luminosity, L_\odot is a unit of Luminosity ( power emitted in the form of Photons conventionally used by Astronomers to Temperature is a physical property of a system that underlies the common notions of hot and cold something that is hotter generally has the greater temperature The kelvin (symbol K) is a unit increment of Temperature and is one of the seven SI base units The Kelvin scale is a thermodynamic In Astronomy and Physical cosmology, the metallicity of an object is the proportion of its matter made up of Chemical elements other than Hydrogen Stellar rotation is the angular motion of a Star about its axis A star is a massive luminous ball of plasma. The nearest star to Earth is the Sun, which is the source of most of the Energy on Earth A year (from Old English gēr) is the time between two recurrences of an event related to the Orbit of the Earth around the Sun A star catalogue, or star catalog, is an Astronomical catalogue that lists Stars In Astronomy, many stars are referred to simply by catalogue A star catalogue, or star catalog, is an Astronomical catalogue that lists Stars In Astronomy, many stars are referred to simply by catalogue The Henry Draper Catalogue ( HD) is an Astronomical Star catalogue published between 1918 and 1924 giving Spectroscopic classifications A star catalogue, or star catalog, is an Astronomical catalogue that lists Stars In Astronomy, many stars are referred to simply by catalogue The Hipparcos and Tycho Catalogues (Tycho-1 are the primary products of the European Space Agency 's astrometric mission Hipparcos. A star catalogue, or star catalog, is an Astronomical catalogue that lists Stars In Astronomy, many stars are referred to simply by catalogue A star is a massive luminous ball of plasma. The nearest star to Earth is the Sun, which is the source of most of the Energy on Earth In common usage a constellation is a group of celestial bodies that are connected together in some arrangement typically stars to form a visible figure or picture Ursa Major ( is a Constellation visible throughout the year in most of the northern hemisphere It also has the traditional names Phecda, Phekda or Phad and comes from the Arabic word فخذ fakhdh [faxð], "thigh" (of the Great 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). Northern Hemisphere is the half of a Planet that is North of the Equator —the word hemisphere literally means 'half ball' This article is about the asterism; for other uses see Big Dipper (disambiguation. Alpha Ursae Majoris (α UMa / α Ursae Majoris is the second-brightest Star in the Constellation of Ursa Major (despite its Bayer designation Beta Ursae Majoris (β UMa / β Ursae Majoris is a Star in the Constellation of Ursa Major. Delta Ursae Majoris (δ UMa / δ Ursae Majoris is a Star in the Constellation Ursa Major. 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. In Astronomy, an asterism is a pattern of Stars seen in Earth's sky which is not an official Constellation. An open cluster is a group of up to a few thousand Stars that were formed from the same Giant molecular cloud, and are still loosely gravitationally The Ursa Major Moving Group, also known as Collinder 285, is the closest Moving group to Earth, that is a set of stars with common velocities in space Like the other stars in the cluster, it is an average main sequence star not unlike our Sun, although somewhat hotter, brighter and larger. The main sequence is the name for a continuous and distinctive band of stars that appear on a plot of stellar color versus brightness The Sun (Sol is the Star at the center of the Solar System.

See also