Betelgeuse

Autor:

H. Raab (User:Vesta)

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Credit:

Praca własna

Krótki link:

https://plwiki.pl/b/d35e8

źródło:

Wikimedia Commons

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1500 x 1000 Pixel (1066785 Bytes)

Opis:

Betelgeuse (Alpha Orionis), the reddish star at the shoulder of Orion, is a semiregular variable star, which usually shines at about magnitude +0.5, only slightly fainter than Rigel (Beta Orionis), the blueish star at the foot of Orion at maigitude +0.1.

In late 2019 and early 2020, however, Betelgeuse has undergone a unusually deep minima, when it's magnitude dropped to about +1.6. That is, it shone at less than 40% of it's usual luminosity, so it's brightness was compareable to Bellatrix (Gamma Orionis), the other shoulder star (+1.6 mag).

In this view, the usual appearance of Orion (left, in an image taken on Feburary 22, 2012), is compared with a image taken taken on February 21, 2020 (right), clearly showing the unusual dimming of the red giant star.

Both images were taken with identical setup and exposure data: Each is a 30 second exposure taken with a Canon EOS 550D camera at ISO 3200, 17mm f/2.8 lens, Cokin P830 diffusor, tracked with the Vixen Polarie star tracker).

Licencja:

CC BY-SA 4.0

Warunki licencji:

Creative Commons Attribution-Share Alike 4.0