File:Caldwell 87 (50291193293).jpg
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Summary[edit]
DescriptionCaldwell 87 (50291193293).jpg |
This image of the globular star cluster Caldwell 87 (or NGC 1261) combines observations made by Hubble’s Wide Field Camera 3 in visible and ultraviolet light along with infrared observations from its Advanced Camera for Surveys. The observations helped astronomers track the motions of the cluster’s stars and better understand the stars’ chemical abundances. In the past, astronomers thought that all the stars in a globular cluster had similar ages and similar chemical abundances. However, recent studies suggest that this might not be true. It seems as though many globular clusters contain stars with varying chemical abundances, suggesting the stars are different ages. Hubble’s observations of Caldwell 87 have allowed astronomers to investigate this further. Discovered in 1826 by the Scottish astronomer James Dunlop, Caldwell 87 is located roughly 50,000 light-years from Earth in the constellation Horologium. It has an apparent magnitude of 8.3, and a small telescope is needed to spot it in the night sky. The cluster is best observed in the late spring from the Southern Hemisphere (or in the late autumn from southern latitudes in the Northern Hemisphere). Credit: NASA, ESA, G. Piotto (Università degli Studi di Padova), and A. Sarajedini (Florida Atlantic University); Processing: Gladys Kober (NASA/Catholic University of America) For Hubble's Caldwell catalog website and information on how to find these objects in the night sky, visit: <a href="https://www.nasa.gov/content/goddard/hubble-s-caldwell-catalog" rel="noreferrer nofollow">www.nasa.gov/content/goddard/hubble-s-caldwell-catalog</a> |
Date | |
Source | Caldwell 87 |
Author | NASA Hubble Space Telescope |
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This image was originally posted to Flickr by NASA Hubble at https://flickr.com/photos/144614754@N02/50291193293. It was reviewed on 16 December 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
16 December 2020
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current | 17:44, 16 December 2020 | 3,837 × 3,648 (13.27 MB) | Szczureq (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Orientation | Normal |
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Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Adobe Photoshop 21.2 (Macintosh) |
File change date and time | 15:29, 25 August 2020 |
Y and C positioning | Centered |
Exif version | 2.32 |
Date and time of digitizing | 10:56, 15 April 2019 |
Meaning of each component |
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Supported Flashpix version | 1 |
Color space | sRGB |
Bits per component |
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Compression scheme | Uncompressed |
Height | 3,648 px |
Width | 3,837 px |
Pixel composition | RGB |
Number of components | 3 |
Date metadata was last modified | 11:29, 25 August 2020 |
Unique ID of original document | xmp.did:2e655839-6bbc-4236-9d2b-52bb5ece20d9 |