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Replacements |
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This page shows all of the images that have been replaced after they were moved off the Home page. It will not include images that were replaced (improved) while still on the Home page. Also, only images which were significantly improved will be shown. Minor changes, like minimal reprocessing of the original data, will not be included. |
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NGC 869 & 884 (Double Cluster) NGC 891 NGC 6656 (M22) NGC 2548 (M48) |
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Astro-Tech AT66ED, ST2000XM, 16:16:16:16 minutes, 76' x 102' This very young, very blue, cluster occupies the center 54' of the field but does not really stand out. Somewhat surprisingly, it is much more obvious in my 9 x 50 finder than in the image. The image includes a huge number of background stars that are below the magnitude visible in the finder. To me, the most interesting things about this cluster are a horseshoe shaped collection of stars with the closed end at the center of the field and opening to the lower left (SE), and several long chains of stars just above the cluster that look almost like writing. |
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NGC 891
10-inch Newtonian, ST2000XM, 100:32:32:32 minutes NGC 891 has always been a nice object to image. It is about as good an example of an edge-on spiral as there is. This version has much improved focus and 28 minutes more exposure compared to the earlier version. |
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Double Cluster (NGC 869 & 864)Astro-Tech AT66ED, ST2000XM, 30:16:16:16 minutes, 76' x102' This is an image made from my backyard in The Woodlands, TX. Open clusters are about the only deep sky objects which can be easily be imaged with the light pollution, except for bright and planetary nebulae using narrowband filters. The Double Cluster is a beautiful object visually, even with binoculars or a small telescope. In dark skies, it can be found fairly easily with the naked eye. This improves on the previous version by having triple the exposure time, 1x1 binning, and no Moon lighting up the scene. |
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 NGC 6656 (M22) 10-inch Newtonian, ST2000XM, 34:22:20:20 minutes M22 is large, bright, and resolvable to the core. It has an attractive mix of star colors. It ranks second behind M13 for the brightest globular visible from mid-northern latitudes. It is also one of the nearest. Images made before and after my tube replacement were merged to produce this image, so it still shows traces of the defects typical of my older images. |
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