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Betelgeuse, Alpha Orionis

Semiregular Variable, type SR c, in Orion

Right Ascension 05 : 55 : 10.3 (h:m)

Declination +07 : 24 : 25 (deg:m)

Distance 650 (ly)

Visual brightness 0.40 .. 1.3 (mag)

Period about 2070 (days)

Spectra type M1-2 Ia-Iab

Right Ascension	05 : 55 : 10.3 (h:m)
Declination	+07 : 24 : 25 (deg:m)
Distance	650 (ly)
Visual brightness	0.40 .. 1.3 (mag)
Period	about 2070 (days)
Spectra type	M1-2 Ia-Iab

MAA Betelgeuse star page
More on Betelgeuse (STScI PRC 96-04, stellar disk photographed by HST)
VLA finds "Boiling" in Betelgeuse's atmosphere (NRAO press release)
Betelgeuse info from Jim Kaler's Stars (Star of the Week) pages
Betelgeuse info from Chris Dolan's constellations pages
Invalid Link! The Story of Betelgeuse from Stars and Atoms by A. S. Eddington, 1928 - Book link
Betelgeuse was Variable Star of the month December 2000 at AAVSO
AAVSO data for Alpha Orionis
Publications on Alpha Orionis (NASA ADS)
SIMBAD data for Alpha Orionis

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Hartmut Frommert
Christine Kronberg
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