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Encyclopedia > Mizar
Mizar
Observation data
Epoch J2000
Constellation Ursa Major
Right ascension 13h 23m 55.5s
Declination +54° 55′ 31″
Apparent magnitude (V) 2.23
Spectral Characteristics
Spectral type A2 V/A2 V/A1 V
U-B color index 0.09
B-V color index 0.13
Variable type  ?
Astrometry
Radial velocity (Rv) -9 km/s
Proper motion (μ) RA: 121.23 mas/yr
Dec.: -22.01 mas/yr
Parallax (π) 41.73 ± 0.61 mas
Distance 78 ± 1 ly
(24 ± 0.4 pc)
Absolute magnitude (MV) 0.33
Other designations
Mizat, Mirza, Mitsar, 79 Ursae Majoris, HR 5054, BD +55 1598A, HD 116656, GCTP 3062.00, SAO 28737, FK5 497, GC 18133, ADS 8891, CCDM J13240+5456, HIP 65378.

Mizar (ζ UMa) is a star in the constellation Ursa Major and is the second star from the end of the Big Dipper's handle. The name comes from the Arabic ميزر mīzar, meaning a waistband or girdle. Mizar has apparent magnitude 2.40 and spectral class A1 V. In astronomy, an epoch is a moment in time for which celestial coordinates or orbital elements are specified. ... This article or section does not cite its references or sources. ... Ursa Major (IPA: ) is a constellation visible throughout the year in most of the northern hemisphere. ... Equatorial Coordinates Right ascension (abbrev. ... In astronomy, declination (dec) is one of the two coordinates of the equatorial coordinate system, the other being either right ascension or hour angle. ... // Headline text HEY!! HOW ARE YOU ALL?? Its nice of you to come read this page. ... In astronomy, stellar classification is a classification of stars based initially on photospheric temperature and its associated spectral characteristics, and subsequently refined in terms of other 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. ... 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. ... Most stars are of almost constant luminosity. ... This article does not cite its references or sources. ... Radial velocity is the velocity of an object in the direction of the line of sight. ... kilometre per second is an SI derived unit of both speed (scalar) and velocity (vector), signified by the symbol km/s or km s-1. ... The proper motion of a star is the motion of the position of the star in the sky (the change in direction in which we see it, as opposed to the radial velocity) after eliminating the improper motions of the stars, which affect their measured coordinates but are not real... A milliarcsecond (m, mas) , or a thoundsanth of an arcsecond. ... A year is the time between two recurrences of an event related to the orbit of the Earth around the Sun. ... A milliarcsecond (m, mas) , or a thoundsanth of an arcsecond. ... A year is the time between two recurrences of an event related to the orbit of the Earth around the Sun. ... This does not cite its references or sources. ... A milliarcsecond (m, mas) , or a thoundsanth of an arcsecond. ... Distance is a numerical description of how far apart things lie. ... A light-year or lightyear, symbol ly, is a unit of length. ... Stellar parallax motion The parsec (symbol pc) is a unit of length used in astronomy. ... In astronomy, absolute magnitude is the apparent magnitude, m, an object would have if it were at a standard luminosity distance away from us, in the absence of interstellar extinction. ... In astronomy, many stars are referred to simply by catalogue numbers. ... The Bright Star Catalogue, also known as the Yale Catalogue of Bright Stars or Yale Bright Star Catalogue, is a star catalogue that lists of all stars of stellar magnitude 6. ... In astronomy, many stars are referred to simply by catalogue numbers. ... The Henry Draper Catalogue is an astronomy catalogue with astrometric and spectroscopic data about more than 225,000 stars. ... In astronomy, many stars are referred to simply by catalogue numbers. ... The Smithsonian Astrophysical Observatory Star Catalog is an astrometric star catalogue. ... The Catalog of Components of Double and Multiple Stars, or CCDM, is an astrometric star catalogue of double and multiple stars. ... In astronomy, many stars are referred to simply by catalogue numbers. ... The Pleiades, an open cluster of stars in the constellation of Taurus. ... This article or section does not cite its references or sources. ... Ursa Major (IPA: ) is a constellation visible throughout the year in most of the northern hemisphere. ... Big Dipper map The seven brightest stars of the constellation Ursa Major, the Great Bear, form a well-known asterism that has been recognized as a distinct grouping in many cultures from time immemorial. ... Arabic ( or just ), is the largest member of the family of Semitic branch of the Afro-Asiatic language family (classification: South Central Semitic) and is closely related to Hebrew, Amharic, and Aramaic. ... // Headline text HEY!! HOW ARE YOU ALL?? Its nice of you to come read this page. ... In astronomy, stellar classification is a classification of stars based initially on photospheric temperature and its associated spectral characteristics, and subsequently refined in terms of other characteristics. ...


With good eyesight one can make out a faint companion just to the east, called Alcor or 80 Ursae Majoris. Alcor has magnitude 3.99 and spectral class A5 V. The two are often called the horse and rider, and the ability to see the second is a traditional test of eyesight. The two stars lie more than a quarter of a light year apart and although proper motions show they move together, it is still not known whether they form a true binary star system, and not an optical binary as currently thought. Alcor can refer to: Alcor Life Extension Foundation 80 Ursae Majoris a star in Ursa Major This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ... A light-year or lightyear, symbol ly, is a unit of length. ... The proper motion of a star is the motion of the position of the star in the sky (the change in direction in which we see it, as opposed to the radial velocity) after eliminating the improper motions of the stars, which affect their measured coordinates but are not real... Artists impression of a binary system consisting of a black hole, with an accretion disc around it, and a main sequence star. ... This topic is about the astronomical phenomenon. ...


More components were discovered with the advents of the telescope and spectroscopy. Mizar was the first telescopic binary discovered, most probably by Benedetto Castelli who in 1617 asked Galileo Galilei to observe it. Galileo then produced a detailed record of the double star. Later, around 1650, Riccioli wrote of Mizar appearing as a double. The secondary star, Mizar B, has magnitude 4.0 and spectral class A7, and comes within 380 AU of the primary; the two take thousands of years to revolve around each other. Mizar A then became the first spectroscopic binary to be discovered, by Pickering in 1889. The two components are both about 35 times as bright as the sun, and revolve around each other in about 20 days. Mizar B (but not Alcor!) was later found to be a spectroscopic binary as well. In 1996 the components of the Mizar A binary system were imaged in extremely high resolution using the Navy Prototype Optical Interferometer. Benedetto Castelli, born Antonio Castelli (Brescia, 1578 – Rome, 1643), took the name Benedetto upon entering the Benedictine Order in 1595. ... Galileo Galilei (15 February 1564 – 8 January 1642) was an Italian physicist, astronomer, and philosopher who was closely associated with the scientific revolution. ... Giovanni Battista Riccioli (b. ... The astronomical unit (AU or au or a. ... Edward Charles Pickering (July 19, 1846 – February 3, 1919) was an American astronomer and physicist, brother of William Henry Pickering. ... 1889 (MDCCCLXXXIX) was a common year starting on Tuesday (see link for calendar). ... 1996 (MCMXCVI) was a leap year starting on Monday of the Gregorian calendar, and was designated the International Year for the Eradication of Poverty. ... The Navy Prototype Optical Interferometer (NPOI) is an interferometer operated by the US Naval Observatory, the Naval Research Laboratory and The Lowell Observatory. ...

Alcor
Observation data
Epoch J2000.0
Constellation Ursa Major
Right ascension 13h 25m 13.5s
Declination +54° 59' 17"
Apparent magnitude (V) +3.99
Absolute magnitude (V) +2.01
Distance 81.2 ± 1.2 ly
(24.9 ± 0.4 pc)
Spectral type A5V
Other designations
Saidak, 80 Ursae Majoris, HR 5062, HD 116842, BD +55 1603, HIP 65477, SAO 28751, GC 18155, ADS 8891, CCDM J13240+5456

The whole five-star system lies about 78 light-years away from us. The components are all members of the Ursa Major moving group, a mostly dispersed group of stars sharing a common birth, as determined by proper motion. The other stars of the Big Dipper, except Dubhe and Alkaid, belong to this group as well. In astronomy, an epoch is a moment in time for which celestial coordinates or orbital elements are specified. ... It has been suggested that this article or section be merged into Julian epoch. ... This article or section does not cite its references or sources. ... Ursa Major (IPA: ) is a constellation visible throughout the year in most of the northern hemisphere. ... Equatorial Coordinates Right ascension (abbrev. ... In astronomy, declination (dec) is one of the two coordinates of the equatorial coordinate system, the other being either right ascension or hour angle. ... // Headline text HEY!! HOW ARE YOU ALL?? Its nice of you to come read this page. ... In astronomy, absolute magnitude is the apparent magnitude, m, an object would have if it were at a standard luminosity distance away from us, in the absence of interstellar extinction. ... This article is in need of attention from an expert on the subject. ... A light-year or lightyear, symbol ly, is a unit of length. ... Stellar parallax motion The parsec (symbol pc) is a unit of length used in astronomy. ... In astronomy, stellar classification is a classification of stars based initially on photospheric temperature and its associated spectral characteristics, and subsequently refined in terms of other characteristics. ... In astronomy, many stars are referred to simply by catalogue numbers. ... The Bright Star Catalogue, also known as the Yale Catalogue of Bright Stars or Yale Bright Star Catalogue, is a star catalogue that lists of all stars of stellar magnitude 6. ... The Henry Draper Catalogue is an astronomy catalogue with astrometric and spectroscopic data about more than 225,000 stars. ... In astronomy, many stars are referred to simply by catalogue numbers. ... In astronomy, many stars are referred to simply by catalogue numbers. ... The Smithsonian Astrophysical Observatory Star Catalog is an astrometric star catalogue. ... In astronomy, many stars are referred to simply by catalogue numbers. ... The Catalog of Components of Double and Multiple Stars, or CCDM, is an astrometric star catalogue of double and multiple stars. ... The Ursa Major Moving Group is the closest moving group to Earth, with its core being located roughly 80 light years away. ... Alpha Ursae Majoris (α UMa / α Ursae Majoris) is the second-brightest star in the constellation of Ursa Major (despite its Bayer designation of alpha). It also has the traditional name Dubhe. ... Eta Ursae Majoris (η UMa / η Ursae Majoris) is a star in the constellation Ursa Major. ...


In fiction

See Mizar in fiction.

The planetary systems of stars other than the Sun and its Solar System are a staple element in much science fiction. ...

External links


  Results from FactBites:
 
Mizar (335 words)
Mizar is a star in the constellation Ursa Major, lying just at the corner of the Big Dipper's handle.
Mizar B and Alcor were both later found to be spectroscopic doubles as well.
Mizar is also the name of a language for writing strictly formalized mathematical definitions and proofs, for a computer program to check these proofs, and for a library containing definitions and theorems.
Mizar (Zeta Ursae Majoris) (379 words)
Mizar is also famous as the first known true binary, in which a pair of stars that orbit each other, were seen telescopically, by Giovanni Riccoli in 1650.
Mizar A was the first spectroscopic binary to be discovered, in 1189.
The Mizar quartet moves through space at a similar speed and direction to Alcor, but measurements by the Hipparcos satellite suggest that Mizar and Alcor are separated by 2-3 light-years –; too far for the systems to be physically associated.
  More results at FactBites »

 
 

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