Betelgeuse


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Related to Betelgeuse: Rigel

Betelgeuse

(bēt`əljo͞oz'), bright star in the constellation OrionOrion,
in astronomy, constellation located on the celestial equator. It is one of the most conspicuous and easily recognizable constellations in the entire sky. From ancient times it has been mentioned in the literature of many peoples and is traditionally depicted as the figure
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; Bayer designation α Orionis; 1992 position R.A. 5h54.8m, Dec. +7°24'. A red supergiant with a luminosity about 13,000 times that of the sun, it is of spectral classspectral class,
in astronomy, a classification of the stars by their spectrum and luminosity. In 1885, E. C. Pickering began the first extensive attempt to classify the stars spectroscopically.
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 M2 Iab. Betelgeuse is a semiregular variable starvariable star,
star that varies, either periodically or irregularly, in the intensity of the light it emits. Other physical changes are usually correlated with the fluctuations in brightness, such as pulsations in size, ejection of matter, and changes in spectral type, color, or
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 with apparent magnitudemagnitude,
in astronomy, measure of the brightness of a star or other celestial object. The stars cataloged by Ptolemy (2d cent. A.D.), all visible with the unaided eye, were ranked on a brightness scale such that the brightest stars were of 1st magnitude and the dimmest stars
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 ranging from 0.06 to 0.75; thus, at maximum brightness it is one of the 10 brightest stars in the sky. Betelgeuse marks the right shoulder of Orion; its distance is about 500 light-years.

Betelgeuse

(bee -t'l-jooz) (α Ori) A remote luminous red supergiant that is the second-brightest star in the constellation Orion. It is a semiregular variable with a period of about 5.8 years; the normal magnitude range is 0.3 to 0.9 but the magnitude has reached 0.15 and been as low as 1.3. It is a strong source of infrared radiation. IRAS found that the long-wavelength infrared is emitted from three concentric shells, the largest with a radius of 1.5 parsecs, ejected within the past 100 000 years. Images of the surface of Betelgeuse have been produced by various interferometry techniques, and indicate a nonuniform brightness. Mv : –5.7; spectral type: M2 Iab; diameter: about 500 times solar diameter; distance: 150 pc.

Betelgeuse

[′bed·əl‚jüs]
(astronomy)
An orange-red giant star of stellar magnitude 0.1-1.2, 650 light-years from the sun, spectral classification M2-Iab, in the constellation Orion; the star α Orionis.
References in periodicals archive ?
The locations of the Betelgeuse and Bellatrix stars on the constellation seems to depict Orion's shoulders.
The reason that red supergiants such as Betelgeuse and Antares are less hot than most other stars is that they are enormous.
The gigantic and bright star Betelgeuse is a superstar, and it is going to put on quite a farewell performance for Earth sometime within the next 1,000,000 years or so.
Orion is instantly recognizable by its three bright stars in a short line (Orion's Belt), and the brilliant orange star Betelgeuse. Rigel is the other bright star in Orion (opposite Betelgeuse from the Belt Stars).
His best friend isn't from Guildford after all, but a small planet near Betelgeuse. He hasn't even managed to find himself a decent cup of tea.
Other luminous Orion stars carry lovely names, such as Rigel and Betelgeuse.
And some space cadet called Mark insists: "As you can see we've got the giant constellation of Orion with the red star Betelgeuse high in the top left hand corner."
Observers (and their families and friends) should find a dark spot shielded from local lights, and using only the unaided eye (not binoculars or telescopes), should count the number of stars they can see inside the rectangle bounded by Betelgeuse, Rigel, y and K Orionis.
We can produce QBooks in huge numbers now which is really exciting."AaRecently released Penguin titles 'Wheelbarrow Wilbur' and 'That's Not Junk' are followed by two new QBooks from the Milly, Molly series; 'Milly, Molly and Alf' and 'Milly, Molly and Betelgeuse'.
Betelgeuse, one of the brightest stars visible to the naked eye, has shrunk in diameter by more than 15 percent since 1993.
Betelgeuse, or [alpha] Orionis, is probably the most interesting star in Orion, and it is easy to observe throughout January to March.
F approached a police officer at an accident scene and exclaimed, "Dude, I'm from the planet Betelgeuse." He appeared disorganized as police questioned him, and officers transported him to the county hospital's psychiatric emergency service.