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The Double Cluster in Perseus770 viewsThe Double Cluster in Perseus, NGC 869 and NGC 884, are bright (naked-eye visible as a hazy patch) relatively young open clusters. Each cluster contains about 300 stars, many of which are blue-white supergiants. Image is a total of 5 hours combined exposure (20 x 900 sec lights, -20 degrees C; 35 darks; 126 flats; 128 bias) taken with an SBIG STF8300c camera; Takahashi Epsilon 180 f/2.8 astrograph; Astro-Physics 1200 mount; Image acquisition with MaxIm DL 6; processed with PixInsight
Sh2-240 Supernova Remnant in Taurus744 viewsImaged is the large supernova remnant Sharpless 2-240 in the constellation Taurus. The complex filamentary structure leads to it's common name, the Spaghetti Nebula. Field of view of the image is 2.12 x 3.21 degrees that captures only part of the nebula, which is approximately 3 degrees. Emission of the nebula is believed to be due to the shock wave of the expanding gas. Image was captured through a Takahashi FSQ 106ED with focal reducer (f/3.6 fl =385mm) and a Canon 60Da DSLR on an Astro-Physics 1200 mount; 23rd and 27th Oct 2014 (20 x 900 sec lights @-20 degrees, dithered; 35 darks; 126 flats; 128 bias; Software: SkyX, MaxIm DL 6, processed in PixInsight
Open Clusters M 46, M47, and NGC 2423 in Puppis740 viewsThe open clusters Messier 46, Messier 47, and NGC 2423 are found in the constellation Puppis embedded in a rich field of Milky Way stars. The small planetary nebula NGC 2438 that appears to be in M 46 is actually not associated with the cluster. M 46 was discovered by Messier in 1771. Smyth describes it as a “A noble, but rather loose assemblage of stars” (Smyth and Chambers, A Cycle of Celestial Objects, 2nd Edition, 1881, Oxford) whereas Webb describes it as a “Beautiful circular cloud of small stars” (Webb, Celestial Objects for Common Telescopes, 4th Ed, 1881, Longmans, Green, and Co ). William Herschel observed the small planetary nebula NGC 2438 in 1786. M 47 was also discovered by Messier in 1771 but not intermediately attributed to Messier due to a mathematical mistake in his coordinates. The cluster was described by Smyth as “a very splendid field of of large and small stars” (under the entry 38 H VIII) and Webb as a “Grand broad group, visible to the naked eye”. This wide field picture was taken with a Takahashi FSQ106ED with focal reducer (f/3.6), Canon 60Da DSLR camera (2.32 arcsec/pixel), and an Astro-Physics 1200 mount on 15 March 2015 in Mayhill, NM.. Total exposure of 1 hour (4 x 15 min lights, dithered; 12 darks; 128 bias; 64 flats); Baader/Astro-Physics guider system; Image acquisition with MaxIm DL; Calibration, alignment, integration, and image processing with PixInsight
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