what is betelgeuse star ?
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Answer:
Betelgeuse is the nearest red supergiant star to Earth. Someday it'll explode as a supernova, but when? Just over a year ago, around September 2019, Betelgeuse sparked excitement around the world when it began dimming noticeably. The strange dimming of Betelgeuse caused some to believe the big event was close at hand.Guinan and colleagues analyzed about 180 years of observations of Betelgeuse, dating back to astronomer John Herschel's 1839 discovery that the star's brightness varies. Guinan's group found that, in addition to the roughly six-year and 400-day cycles, Betelgeuse might have a third, smaller cycle of about 187 days.The Betelgeuse star has a rotation period of about 30 years.
Radius: 617.1 million km (887 R☉)
Mass: 2.188 × 10^31 kg (11 M☉)
Apparent magnitude (K): −4.05
Apparent magnitude (J): −3.00
Absolute magnitude (MV): −5.85
Constellation: Orion
Answer:
Betelgeuse is the nearest red supergiant star to Earth. Someday it'll explode as a supernova, but when? Just over a year ago, around September 2019,Betelgeuse sparked excitement around the world when it began dimming noticeably. The strange dimming of Betelgeuse caused some to believe the big event was close at hand.
The researchers, using a uniform disk model, determined that Betelgeuse had a diameter of 0.047″, although the stellar disk was likely 17% larger due to the limb darkening, resulting in an estimate for its angular diameter of about 0.055".
about 30 years
The Betelgeuse star has a rotation period of about 30 years.