Betelgeuse (α Ori)

The pink arrow at the star on left labeled α indicates Betelgeuse in Orion.
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Orion
Pronunciation /ˈbtəldʒz/ or
/ˈbɛtəldʒz/
Right ascension 05
Declination +07° 24′ 25.426″
Apparent magnitude (V) 0.42 (0.3 to 1.2)
Characteristics
Spectral type M2Iab
Apparent magnitude (J) -2.99 ± 0.10
U−B color index 2.06
B−V color index 1.85
Variable type SR c (Semi-Regular)
Astrometry
Radial velocity (Rv) +21.91 km/s
Proper motion (μ) RA: 24.95 ± 0.08 mas/yr
Parallax (π) 5.07 ± 1.10mas
Distance 643 ± 146 ly
(197 ± 45 pc)
Absolute magnitude (MV) −6.05
Details
Mass ~18–19M
Radius ~1180R
Luminosity ~140,000L
Surface gravity (log g) -0.5
Temperature 3,500K
Metallicity 0.05 Fe/H
Rotation 5 km/s
Age ~1.0×10 years
Other designations
Betelgeuse, α Ori, 58 Ori, HR 2061, BD +7° 1055, HD 39801, FK5 224, HIP 27989, SAO 113271, GC 7451, CCDM J05552+0724AP, AAVSO 0549+07
Database references
SIMBAD data

Get more info about Betelgeuse in Wikipedia

This article uses material from the Wikipedia article
Betelgeuse, which is released under the Creative Commons Attribution-Share-Alike License 3.0