Towards this, there is a very opaque and extensive supernova residue that required a record amount of exposure time and processing time. Aarni Vuori also used his own description time for this destination. The total exposure time is about 45 hours and the image is assembled from 6 pieces (i.e. mosaic 3 x 2).

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Simeis 147 is a very broad and opaque supernova residue in the constellation Taurus. The remnants of a star that exploded about 30,000 years ago form a fibrous atmosphere spanning 160 light-years. The supernova expands at about a thousand kilometers per second. For fun, I calculated how long it would take for a gas cloud to be one percent larger in diameter. It would rumble for 480 years, a thousand kilometers per second was not a very wild pace on this scale. Note the image is marked in the lower left corner of the moon's diameter in the sky to give a scale of the object's size. The p...

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Propeller fog photographed from the beginning of the week. For a long time it was time to describe this object and now I got it done. Exposure time accumulated over four hours in just over five minutes. The target is a fairly powerful H alpha target.

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The picture shows an area of the Swan constellation, where the Star Nebulae form a flame-like impression. At the bottom of the image you can find NGC 6914 glowing in blue, and Simeis 57 forming the S-pattern. The total exposure was 3.7 hours

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At the beginning of the season, I have come to focus on the most well-known destinations, so I look for such a rarer at the end of the pipe. Simeis 57, also known as DWB-111, is a hydrogen emission mist in the constellation of Swan between Deneb and Delta Cygn. The subject is relatively dim, and required 10 minutes of single exposures to emerge. In addition to Kotka's E-fog, this is one of the most special fog formations I have ever seen. More information: http://www.astrobin.com/264276/

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The Simeis 147 is an exceptionally dim object and challenging to photograph. At long shutter speeds, details still emerged nicely.

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Simeis 147, Sharpless 240 , is a very opaque and extensive supernova residue in the constellation Taurus. I collected exposures from several nights for a total of 13h Hydrogen emission. The color channels are from my smaller image. the distance is ~ 3000 light-years and the diameter is ~ 160, the apparent size of the sky is three degrees (Six full moon diameters). The gas mycelium is constantly expanding at ~ 1000km per second, due to its large size and distance, our lifetime is not enough to show changes in the target. In the middle of the fog, invisible, is a neutron star that is a newly obs...

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