File:Betelgeuse.jpg
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Summary
| Description |
English: 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 underwent an unusually deep minimum, when its magnitude dropped to about +1.6. That is, it shone at less than 40% of its usual luminosity, so its brightness was comparable 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 February 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 diffuser, tracked with the Vixen Polarie star tracker. |
| Date | February 22 (left) and 2020 February 21 (right) |
| Source | Own work |
| Author | H. Raab (User:Vesta) |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 08:26, 25 February 2020 | | 1,500 × 1,000 (1.02 MB) | Vesta | User created page with UploadWizard |
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