The ailing supergiant

Betelgeuse
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According to Bayer designations the Betelgeuse is the alpha star of Orion constellation, but actually Rigel is brighter which known as β Orion. The red supergiant star is located in the northeast corner of the constellation Orion. In 1836 Herschel noticed that the star showed changes in luminosity due to its naked eye observability. Based on the observations, it was classified as a semiregular variable star. Betelgeuse is an end-of-life star that periodically pulsates - in which case its diameter and temperature change, causing a change in luminosity, as do the occasional darker spots on its surface.
From October 2019, the brightness of the star was dramatically reduced. Indeed, its brightness has become unusually dim compared to recent years. All of this could have been caused by a huge spot on the star's surface or a gas/dust cloud thickening in front of the star, as seen on the image by ESO Very Large Telescope.
The international and the Hungarian tabloid press have been very keen to see a supernova again in our galaxy after almost half a thousand years. Finally, the research by astronomers E. Guinan and R. Wasatonic was right. The researches of Villanova University said the star had a slightly longer 430-day period. According to photometric measurements, Betelgeuse was the dimmest at 1.66m in February 2020. I took my photo when the Betelgeuse has started brightening again.

Date:

21/02/2020 20:51-21:11 UT

Total exposure time:

20 minutes

Location:

Tápióbicske, Pest, Hungary

Camera:

Canon EOS 1300D (modified)

Telescope:

Home-made 200/800 mm Newtonian reflector

Mount:

Sky-Watcher EQ6-R Pro GoTo

Guiding:

Lacerta MGEN-II

Corrector:

Sky-Watcher f/4 coma corrector

Focal ratio, length:

f/4, 800 mm

ISO:

800

Light:

4 x 300 s

Dark:

10

Flat:

15

Bias:

10

Processing:

Astro Pixel Processor, PixInsight, Adobe Lightroom, Adobe Photoshop

Location

Annotation

Betelgeuse 

Main objects: Betelgeuse, V0528 Ori, V2767 ori, PGC 3073580

Name:

Betelgeuse, α Orionis, 58 Ori

Constellation:

Orion

Coordinates:

R.A. 05 h 55 m 10 s Dec. +07° 24′ 26″

Type:

Semiregular variable (SRc)

Spectral type:

Red supergiant (M1-2)

Color index (B-V):

1.52

Distance from Earth:

498 light-years

Brightness:

+1.55m (+0.0m - 1.6m)

Sidereal period:

2,335 days

Observable:

Winter

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Betelgeuse light curve (AAVSO)

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ESO Very Large Telescope - Montarges et al.