File:Messier 52 M52 NGC 7654 Cassiopeia, with a Meade ACF 8 in 0.7x (51686750656).jpg
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Summary
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Messier 52 M52 NGC 7654 Cassiopeia, with a Meade ACF 8 in 0.7x M52 (NGC 7654) is a bright open cluster in Cassiopeia, discovered by Charles Messier on September 7, 1774. It contains 100 confirmed and 193 probable members. While the brightest star in its field is HIP 115542, a giant with an apparent magnitude 8.25 and spectral class F8Ib/II, all of the other members are fainter than magnitude 10.5. With a combined apparent magnitude of 6.9 and angular size of 13 arcmin, the cluster is easily identified with binoculars. Its age is estimated between 35 and 150 million years. Due to the extinction of starlight by interstellar gas and dust, which reduces apparent magnitude to an uncertain degree, the distance to the cluster is imprecisely estimated between 3,000 and 7,000 LY. Assuming a median distance of 5,000 LY, and given the apparent diameter of 13 arcmin, the cluster is approximately 19 LY across, or 3,591 cubic LY in volume, with average distance between stars of 2.65 LY. Due to the cluster's extreme youth, there is virtually no probability of extraterrestrial life among its member stars. Image details: -Meade 8 ACF telescope, AP 0.7x compresor (200 x 1400 mm) -Modified Canon T3i camera, Astronomik CLS-CCD filter -iEQ30pro mount, 60mm f/4 Orion SSAGpro autoguider -12 x 90 sec subs, ISO 1600, processed with 30 dark and 30 bias frames -Software: PHD2, DSS, XnView, StarNet++, StarTools v 1.3 and 1.7 -Limiting magnitude ~18.0. |
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| Source | Messier 52 M52 NGC 7654 Cassiopeia, with a Meade ACF 8 in 0.7x |
| Author | Rudy Kokich |
Licensing
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This work has been released into the public domain by the author on Flickr, where the author has declared it as a "Public Domain Work" and tagged it with the Creative Commons Public Domain Mark.
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This image was originally posted to Flickr by rudykokich at https://flickr.com/photos/140097441@N02/51686750656. It was reviewed on 22 April 2024 by FlickreviewR 2 and was confirmed to be licensed under the terms of the Public Domain Mark. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 11:46, 19 December 2021 | | 1,800 × 1,200 (1.74 MB) | Siloepic (talk | contribs) | Transferred from Flickr via #flickr2commons |
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