Betelgeuse

Autor/Urheber:

H. Raab (User:Vesta)

Attribution:

Das Bild ist mit 'Attribution Required' markiert, aber es wurden keine Informationen über die Attribution bereitgestellt. Vermutlich wurde bei Verwendung des MediaWiki-Templates für die CC-BY Lizenzen der Parameter für die Attribution weggelassen. Autoren und Urheber finden für die korrekte Verwendung der Templates hier ein Beispiel.

Shortlink:

https://www.dewiki.de/b/235f4a

Quelle:

Wikimedia Commons

Größe:

1500 x 1000 Pixel (1066785 Bytes)

Beschreibung:

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.

Lizenz:

CC BY-SA 4.0

Bild teilen: