Alpha Orionis
| Betelgeuse ( Orionis) | |
.jpg) Betelgeuse view using the Hubble Space Telescope | |
| Observational data ( Epoch J2000.0 ) | |
|---|---|
| Right ascension | 05 h 55 m 10.29 s |
| Declination | 07 24 '25.3 " |
| Constellation | Orion |
| Apparent magnitude | 0.3 to 1.2 |
| Features | |
| Spectral type | M1-2 Ia-Iab |
| Index UB | 2,06 |
| Index BV | 1,86 |
| Index RI | ? |
| Variability | SR c (semi-regular) |
| Astrometry | |
| Radial velocity | 21.0 km / s |
| Proper motion | = 27.33 mas / a = 10.86 mas / a |
| Parallax | 7.63 1.64 mas |
| Distance | 427 92 s. (131 pc ) |
| Absolute magnitude | -5.3 To -5.0 |
| Physical Characteristics | |
| Mass | ~ 15 M |
| Radius | ~ 591 R |
| Surface gravity (log g) | ? |
| Brightness | 63,000 L |
| Temperature | 3600 K |
| Metallicity | ? |
| Rotation | ? |
| Age | 1.0 10 7a |
| Other designations | |
| Ori ( Bayer ), 58 Ori ( Flamsteed ), HR 2061, BD 7 1055, HD 39801, SAO 113271, FK5 224, HIP 27989. | |
Betelgeuse ( Orionis) is a star semi-regular variable, a red supergiant in the constellation of Orion , located between 430 and 640 light years. This is the 9th most brilliant star in the sky. Although the designation of "alpha" in the Bayer designation , it is only the second in the constellation of Orion , behind Rigel Name Many star names are of Arab origin, called by great Arab astronomers such as Al-Battani , the brightest stars in defining the contours of the constellation of Orion are all original Arabic name Betelgeuse , Bellatrix , Mintaka , Alnilam , Alnitak , Rigel and Saiph. The name "Betelgeuse" comes from the Arabic phrase "al-Ghul ibt" meaning "the giant's shoulder." Another origin of this word could be , yad al-Jawz, hand plant (Orion), transcribed with an error reading diacritic in Bedalgeuze (letters b and there are similar and have respectively one and two diacritical dots in Arabic ). It is situated on the shoulder of Orion, is a supergiant red, cold and very apparent to the eye. This is likely the biggest star of this region of the Milky Way. She is also the only planet known to magnitude one whose brightness varies by about 1 magnitude over a period of 5.7 years. According to some calculations, it could fill, when presenting its normal size, the orbital area in March and when it grows, that of Jupiter. In fifteen years, its diameter was reduced by 15%, even with unknown reasons. Alpha Orionis is the first extra-solar star may have been spatially resolved, before the advent of techniques of interferometry. This red supergiant is about 1000 times larger than the Sun and shines more than 100 000 suns combined. Its characteristics clearly show that we are witnessing the end of life of a star. With an age of only a few million years, Betelgeuse is doomed to explode in a supernova that will be easily visible from Earth even in daylight, by a few thousand years. Its plumes reach an impressive size equivalent to the size of the solar system -wide. The ESO and the Observatoire de Paris have, in July 2009 , obtained images of unprecedented accuracy of the red giant using the Very Large Telescope based in Chile . Simulation of bubbles bubbling The pulsations of the star Comparison of the size of the stars Artist's representing the size of plumes of material Betelgeuse In addition, the research of K. Ohnaka also showed a giant bubble bubbling on the surface of Betelgeuse. They are due to huge movements of convection gas occurring within the star a bit like water boiling in a pot . A series of observations spectropolarimetric of Betelgeuse, performed with the Telescope Bernard Lyot of the Pic du Midi Observatory , revealed the presence of a weak magnetic field on its surface, suggesting that the convective motions themselves may be the The origin of this magnetic field, through mechanism dynamo small-scale . Douglas Adams , author of the bestselling series The Guide to the Galaxy , created a character named Ford Prefect , a journalist for that guide, and a native of a small planet on the edge of Betelgeuse. It also revolves around Betelgeuse as the Planet of the Apes by Pierre Boulle. Betelgeuse is the seat of a strange galactic government in the novel The Gambit star of Gerard Klein (1958). Betelgeuse is a planet orbiting the star of the same name in The Worlds of Aldebaran , Leo cartoon. Features
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