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	Mizar (Zeta Ursae Majoris)
		The fourth brightest star in the constellation Ursa Major and the middle star in the handle of the Big Dipper.
		It forms a well known naked-eye double with fourth magnitude Alcor (80 Ursae Majoris), 0.2° to the northeast.
		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.
	www.daviddarling.info /encyclopedia/M/Mizar.html (335 words)

	Ursa Major Moving Group - Wikipedia, the free encyclopedia
		The Ursa Major Moving Group is the closest moving group to Earth, that is, a set of stars with common velocities in space, thought to have a common origin.
		All stars in the Ursa Major Moving group are in roughly the same location in the Milky Way Galaxy, are moving in roughly the same direction at roughly the same speed, contain roughly the same mix of metals, and, based on stellar theory, appear to be roughly the same age.
		The Ursa Major Moving Group was discovered in 1869 by Richard A. Proctor, who noticed that, except for Dubhe and Alkaid, the stars of the Big Dipper asterism all have proper motions heading towards a common point in Sagittarius.
	en.wikipedia.org /wiki/Ursa_Major_Moving_Group (638 words)

	Ursa Major Did You Mean ursa_major_c8b8 (Site not responding. Last check: 2007-10-28)
		Ursa Major (Ursa Maior in Latin) is a constellation visible throughout the year in the northern hemisphere.
		W Ursae Majoris is the prototype of a class of contact binary variable stars, and ranges in magnitude between 7.75m and 8.48m.
		In earlier times, Greek mythology did not consider Ursa Major a bear, and instead its 3 bright stars (situated in the tail) were seen as apples growing on a tree (sometimes represented by the fainter stars in the remainder of the constellation).
	www.did-you-mean.com /Ursa_Major_c8b8.html (1065 words)

	Belt of Venus: Zeta + 80 Ursae Majoris (Struve 1744/Mizar and Alcor)
		Belt of Venus: Zeta + 80 Ursae Majoris (Struve 1744/Mizar and Alcor)
		80 UMA took on a cyanish blue appearance.
		The separation between Zeta and 80 UMA was about half the field of my 10 mm eyepiece, or about 720 arc seconds.
	www.perezmedia.net /beltofvenus/archives/000603.html (166 words)

	Mizar - Wikipedia, the free encyclopedia
		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.
		In 1996 the components of the Mizar A binary system were imaged in extremely high resolution using the Navy Prototype Optical Interferometer.
		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.
	en.wikipedia.org /wiki/Zeta_Ursae_Majoris (513 words)

	Wikipedia: Mizar
		Mizar is a star in the constellation Ursa Major, lying just at the corner of the Big Dipper's handle.
		The name comes from the Arabic Mi'Zar, meaning a waistband or girdle; the Bayer designation of the star is Zeta Ursae Majoris.
		The components are all members of the Ursa Major moving cluster, a mostly dispersed group of stars sharing a common birth, as determined by proper motion.
	www.factbook.org /wikipedia/en/m/mi/mizar.html (356 words)

	Virtual Science Center
		One of the Bear's front paws is marked by the stars Iota Ursae Majoris and Kappa Ursae Majoris.
		One rear paw is marked by Lambda Ursae Majoris and Mu Ursae Majoris, and the other is marked by Nu Ursae Majoris and Xi Ursae Majoris.
		From Europe through Siberia and across the Bering Strait to the American northwest, many people saw a bear (the four stars of the Dipper's bowl), followed by three hunters (the three stars of the Dipper's handle.) This widespread image of a bear occurring across the globe hints at the possible great age of the constellation.
	www.chabotspace.org /vsc/planetarium/thesky/constellationlore/ursamajor.asp?rw=yes (892 words)

	* 80 Ursae Majoris - (Astronomy): Definition
		Alcor, forever tied to Mizar, is hardly ever spoken of unless as "Mizar and Alcor," a naked eye double in the tail of Ursa Major that the Arabs referred to as the horse and rider.
		The star Alcor (Scientific Name 80 Ursae Majoris) is located at right ascension 13h 25.225m and declination 54° 59.283'.
		Alcor is a relatively dim star with a magnitude of 4.01.
	en.mimi.hu /astronomy/80_ursae_majoris.html (121 words)

	World Architecture Images-
		Petrie suggested a redetermination of north was made after the construction of the core, but a mistake was made, and the casing was built with a different orientation.
		This deviation from the north in the core, corresponding to the position of the stars b-Ursae Minoris and z-Ursae Majoris about 3,000 years ago, takes into account the precession of the axis of the Earth.
		A study by egyptologist Kate Spence, shows how the changes in orientation of 8 pyramids corresponds with changes of position of those stars through time.
	www.essential-architecture.com /ASIA-WEST/NA-EG/NA-EG-013.htm (4407 words)

	Extrasolar Planets - 47 Ursae Majoris
		47 Ursae Majoris b is a rather promising world, orbiting its parent star at a distance where liquid water may still exist.
		But 47 Ursae Majoris b is a cold world, though.
		Not as dry as with 70 Virginis b and not as frozen as with Jupiter, the moons of 47 Ursae Majoris b would be something in between.
	www.exoplaneten.de /47uma/english.html (204 words)

	Alcor
		Ursa Major that the Arabs referred to as the horse and rider.
		In the early 1700s, the English astronomer John Flamsteed organized a new catalogue of stars in which they were ordered from west to east within the constellations, Alcor number 80 in Ursa Major.
		Mizar and Alcor are part of the Ursa Major cluster, whose core consists of the middle five stars of the Big Dipper.
	www.astro.uiuc.edu /~kaler/sow/alcor.html (472 words)

	AAVSO: UX Ursae Majoris, Spring 2004 Variable Star Of The Season
		UX Ursae Majoris was first discovered to be variable in 1933 by S. Beljawsky during his investigation of Simeiz Observatory plates.
		With a relatively constant light curve interrupted by eclipse-induced drops in magnitude, UX UMa was orginally thought to be an Algol-type eclipsing variable.
		Such short-period eclipsing systems would ordinarily be classified as W Ursae Majoris type, however, the constant light between eclipses kept it as a member of the Algol class.
	www.aavso.org /vstar/vsots/spring04.shtml (1711 words)

	Alpha Ursae Majoris (Site not responding. Last check: 2007-10-28)
		Zeta is the second star on the handle and is one of the most famous binary systems in the heavens: binoculars.
		Binoculars, or even the naked-eye on exceptional nights, reveal the dimmer companion Alcor (80 UMa) at a position angle of 71º and a separation of 708".
		Observers once reasoned that the two were optical binaries only, not gravitationally bound to each other, since Mizar was thought to be 60 light years away, and Alcor 80.
	www.dibonsmith.com /uma_z.htm (198 words)

	NAI: News Stories (Site not responding. Last check: 2007-10-28)
		The planet is the second found to orbit the star 47 Ursae Majoris (47 UMa) in the Big Dipper, also known as Ursa Major or the Big Bear.
		The new planet is at least three-fourths the mass of Jupiter and orbits the star at a distance that, in our solar system, would place it beyond Mars but within the orbit of Jupiter.
		Although 47 UMa has a planet similar to Jupiter in mass and orbital distance, there is no evidence that this star system also has an Earth-like planet.
	nai.arc.nasa.gov /news_stories/news_detail.cfm?ID=116 (892 words)

	Dave's Astronomy Pictures - Mizar and Alcor
		Their modern names are Mizar (the bright one, officially Zeta Ursae Majoris) and Alcor (80 Ursae Majoris).
		Mizar (Zeta in Ursa Major) is a binary star whose components orbit each other, taking around 5000 years to do so.
		It has been discovered by spectroscopic methods that both Mizar A and B are each binary stars, although the companions to each cannot be seen from Earth.
	www.davesastro.co.uk /dso/mizar.html (293 words)

	Origins: Library
		An international team of astronomers has discovered eight new extrasolar planets, bringing to nearly 80 the number of planets found orbiting nearby stars.
		This characteristic is shared by two planets (one of them the size of Jupiter) previously detected by the same team around 47 Ursae Majoris, a star in the Big Dipper constellation, and one around the star Epsilon Reticulum.
		The majority of the extrasolar planets found to date are in an elongated, or "eccentric," orbit.
	origins.jpl.nasa.gov /library/extrasolar/101501-a.html (491 words)

	NOVA Online/Hunt for Alien Worlds/Find the Planets
		Lying near the Big Dipper in the constellation Ursa Major, this star may be the easiest for amateur sky watchers to locate.
		Announced at the same time as 70 Virginis, its orbiting planet is a third the size and, with a surface temperature of -80 degrees Celsius, considerably cooler.
		The planet lies roughly twice as far from its parent star as the Earth does from the sun.
	www.pbs.org /wgbh/pages/nova/worlds/planets.html (708 words)

	Plotting A Habitable Zone For 47 Ursae Majoris
		This figure shows the relative scale of the orbits of the two planets ('b' and 'c') orbiting the star 47 Ursae Majoris.
		Of all the extrasolar planetary systems detected by astronomers in recent years, the star 47 Ursae Majoris and its known companions, two Jupiter-sized planets, is the one that most closely resembles our own solar system.
		The findings were reported at the American Astronomical Society meeting in Washington, D.C., by Gregory Laughlin, an assistant professor of astronomy and astrophysics at the University of California, Santa Cruz; John Chambers of NASA Ames Research Center; and Debra Fischer of the University of California, Berkeley.
	www.spacedaily.com /news/extrasolar-02a.html (1030 words)

	zeta Ursae Majoris
		Ursae Majoris, 79 UMa, HR 5054, HD 116656, SAO 28737
		Ursae Majoris, 79 UMa, HR 5055, HD 116657, SAO 28738
		Also, common proper motion with 80 UMa and other members of the Ursa Major stream.
	www.alcyone.de /SIT/doubles/SIT003288.htm (389 words)

	Alcor
		Alcor is a variable star of Delta Scuti type; see Caph.
		According to Burnham, Alcor is part of a star cluster including at least 16 other stars from the Ursa Major area of the sky, as well as Alioth, Merak, Mizar, Phecda, and Megrez in the Big Dipper.
		The Ursa Major cluster represents an ellipsoidal volume of space about 30 ly long by 18 ly in width.
	domeofthesky.com /clicks/alcor.html (124 words)

	Alcor: Origin of Our Name
		In view of our logical destiny (the stars), we searched through star catalogs and other books on the subject, hoping to find a star with a name that could serve as a cryonics acronym.
		"Alcor", 80 Ursae Majoris, was just what we had been looking for.
		It not only had some acronymal "fit" for cryonics but was symbolic for its historic use as a test for eyesight and was located in a very well known constellation.
	www.alcor.org /printable.cgi?fname=AboutAlcor/nameorigin.html (569 words)

	Software Bisque
		An asterism is a pattern created by reasonably bright stars and is often times even a subset of a constellation line depiction.
		Note: As is the case with the constellation line drawings the asterism lines are very subjective and there really isn't any one "standard" set to choose from, so far as I know.
		50-Alpha Ursae Majoris (Dubhe), 48-Beta Ursae Majoris (Merak), 64-Gamma Ursae Majoris (Phecda), 69-Delta Ursae Majoris (Megrez), 77-Epsilon Ursae Majoris (Alioth), 80 Ursae Majoris (Alcor), and 80 Ursae Majoris (Alkaid).
	www.bisque.com /tom/asterisms/asterisms.asp (1331 words)

	AAVSO: Variable Star of the Month, Z Uma
		Located in the constellation Ursa Major and within the bowl of the big dipper, lies the semiregular variable Z Ursae Majoris.
		Harvard College Observatory, discovered the variable Z Ursae Majoris in 1904 due in large part to its peculiar spectrum.
		The variable star, Z UMa, sits in the bowl of the The Big Dipper, nearly 3 degrees west-northwest of the star “delta”, which connects the handle to the bowl of the dipper.
	www.aavso.org /vstar/vsots/0300.shtml (1619 words)

	Supernova 1997ff
		Up-to-date technical summaries on this star are available at: NASA's ADS Abstract Service for the Astrophysics Data System; and the SIMBAD Astronomical Database mirrored from CDS, which may require an account to access.
		Constellation Ursa Major is only visible from the northern hemisphere.
		For another illustration, see David Haworth's Ursa Major.
	www.solstation.com /x-objects/sn1997ff.htm (1314 words)

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