File:Betelgeuse.jpg
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Summary[edit]
DescriptionBetelgeuse.jpg |
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 | |
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current | 08:26, 25 February 2020 | 1,500 × 1,000 (1.02 MB) | Vesta (talk | contribs) | User created page with UploadWizard |
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Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Camera manufacturer | Canon |
---|---|
Camera model | Canon EOS 550D |
Author | H. Raab |
Exposure time | 30/1 sec (30) |
F-number | f/2.8 |
ISO speed rating | 3,200 |
Date and time of data generation | 21:36, 22 February 2012 |
Lens focal length | 17 mm |
Width | 2,700 px |
Height | 1,800 px |
Bits per component |
|
Compression scheme | Uncompressed |
Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Data arrangement | chunky format |
Software used | Adobe Photoshop CC 2018 (Windows) |
File change date and time | 23:05, 24 February 2020 |
Exposure Program | Manual |
Exif version | 2.21 |
Date and time of digitizing | 21:36, 22 February 2012 |
APEX shutter speed | −4.906891 |
APEX aperture | 2.970854 |
APEX exposure bias | 0 |
Maximum land aperture | 3 APEX (f/2.83) |
Metering mode | Spot |
Flash | Flash did not fire, compulsory flash suppression |
DateTime subseconds | 04 |
DateTimeOriginal subseconds | 04 |
DateTimeDigitized subseconds | 04 |
Color space | sRGB |
Focal plane X resolution | 5,728.1767955801 |
Focal plane Y resolution | 5,808.4033613445 |
Focal plane resolution unit | inches |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Manual white balance |
Scene capture type | Standard |
Serial number of camera | 1333732835 |
Lens used | 17-50mm |
Owner of camera | H. Raab |
Rating (out of 5) | 0 |
Date metadata was last modified | 00:05, 25 February 2020 |
Unique ID of original document | xmp.did:28C13328555EE111BB65F2A8A3AD45F8 |
IIM version | 10,980 |