Alcor is a hot, white A5V main sequence star having a luminosity about 13 times that of the sun.
The spectral type implies that Alcor has an effective temperature of 8500 K, a diameter 1.7 times that of the sun, and a mass of about 2.2 solar masses.
Alcor is a great way to test your vision and the "quality" of the night sky. If you can see Alcor, your eyesight is good, you are far from lights (such as streetlights or moonlight) and the sky is clear. Perfect for astronomy! ...
L'Alcoran de MahometL'AldeaL'Alfàs del Pi
L'AlizéL'AlkolumineL'allée des Alyscamps
L'Alouette (The Lark)L'AlpagueurL'Alt Millars ...
The Alcor and Mizar system is a fascinating one. Mizar itself can be split into two by a telescope, and each component of Mizar is also spectroscopic binary (meaning that the individual stars are too close to be separated, ...
In large part its fame comes from the coupling of the star with a nearby visual companion, fourth magnitude Alcor, only 11.8 minutes of arc (a fifth of a degree) to the northeast.
Alcor 80 Ursae Majoris
Alcyone Eta Tauri
Aldebaran Alpha Tauri
Alderamin Alpha Cephei
Aldhafera Zeta Leonis
Aldhanab Gamma Gruis
Aldhibah Zeta Draconis
Aldib Delta Draconis
Al Fawaris Delta Cygni
Alfecca Meridiana Alpha Coronae Australis ...
The two members of the double, visible separately with keen eyesight, are called Mizar and Alcor. They were depicted as a horse and its rider on the 1524 star chart of Peter Apian, apparently following a popular German tradition.
If you have ever looked at the two stars in the handle of the Big Dipper, Alcor and Mizar, they look like they are close to one another. This is actually an optical binary system, since these stars are really very far apart from one another.
companion, called 'Alcor' or 80 UMa (otherwise a small binocular will help). In small telescops another 4th mag star becomes visible. Each of these stars is as well a spectroscopic binary.
Xi UMa is a binary with an orbiting period of 60 years.
Alcor (Saidak, 80 UMa), Alioth (ε UMa), Alkaid (Benetnash, η UMa), Alula Australis (ξ UMa), Alula Borealis (ν UMa), Dubhe (α UMa), Megrez (Kaffa, δ UMa), Merak (β UMa), Mizar (ζ UMa), Muscida (ο UMa), ...
Mizar has a faint visual companion, [8334] Alcor (80 Ursae Majoris). Both stars are in fact binary systems and all the four stars involved are main sequence white dwarfs. Both Mizar and Alcor belong to the Ursa Major moving group.
With good eyesight one can make out a faint companion just to the east of Mizar, called Alcor or 80 Ursae Majoris. The two are often called the horse and rider, and the ability to see the second is a traditional test of eyesight.
Zeta UMa, Mizar, is the best of the bunch and probably the easiest to find as well. A multiply system with Alcor, AB form a fixed binary at PA 152º, separation 14.4". Alcor (component C) is a distant 12 minutes east (709").
Name: Mizar (="mantle" or "belt") + Alcor (="humbled one"; called "Little Rider" in German)
God Warriors: Syd + Bud
Info: Zeta UMa is a double star that was often used to test the eyes. Sometimes it's called "Horse and Rider".
Makes naked eye pair with Alcor
Find your way around Ursa Major (Big Dipper)
Author: Alistair Thomson ...
Named Stars: DUBHE (Alpha UMa) MERAK (Beta UMa) PHAD (Gamma UMa) MEGREZ (Delta UMa) ALIOTH (Epsilon UMa) MIZAR (Zeta UMa) ALCOR (80 UMa)
Once you find and identify the Big Dipper you can use it to find many other stars and constellations.
By one account, the missing Pleiad ran off with Mizar, the middle handle star of the Big Dipper. These two stars can be seen snuggling next to one another on a clear, dark night. If you can't see Mizar's companion star -- Alcor -- with the eyes alone, ...
The University Press of Mississippi, founded in 1970, is a publisher that is sponsored by the eight state universities in Mississippi:*Alcorn State University...
, 2000. 225 pp.
McNeil, Jim. Charleston's Navy Yard: A Picture History.
Talitha (Iota UMa)
Tania Borealis (Lambda UMa)
Tania Australis (Mu UMa)
Alula Borealis (Nu UMa)
Alula Australis (Xi UMa)
Muscida (Omicron UMa)
Muscida (Pi 1 UMa)
Muscida (Pi 2 UMa)
ALCOR (80 UMa) ...
close together are gravitationally connected, they could be actually at different distances from the observer. Such stars are called optical doubles, e.g. zeta Ursa Majoris, which consists of two physically unrelated stars, Mizar and Alcor.
5 million ly away and measures 90,000 ly across. To find it follow a chain of four magnitude 8 stars for about 5°40' E of Alcor-Mizar pair (z Ursae Majoris and 80 Ursae Majoris - see finder chart below). M101 is noticable in binoculars.
 See also: Mizar, Star, Sky, Ursa Major, Sun
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