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Showing results for tags 'ngc 6946'.
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The forecast indicated clear skies until 11pm but sadly the session was cut short nearly two hours early so I had just 45 minutes with the scope.... better than nothing, I guess! While the scope cooled, I spent a little time trying to glimpse M30 in binoculars, immediately to the West of 41 Capricorni but at that elevation on a less than perfect night, I was unable to see anything. As the sky wasn't great, I thought i'd pick overhead targets and started with the Fireworks Galaxy, NGC 6946 (Caldwell 12). Easy to find going from Alpha to Eta Cephei and then on to the Southwest of HR7938 and HR7925. At magnitude 8.8, you might think this easy but it has quite a low surface brightness and appeared as a quite large, irregularly shaped and diffuse wisp. I had planned the long star hop to NGC 40, the Bow-Tie Nebula but after realising that there were an increasing number of wispy clouds in the sky, the only other target of the night was NGC 663. I had only previously seen this in binoculars and the scope revealed 20 stars (perhaps another four or five with averted vision) in a soft haze. The arrangement looked a bit like a three leaf clover. Hopefully the next session will be a little longer! __________________________________________________ ______ Observing Session: Tuesday 16th October 2012, 20:30 hrs to 21:15 hrs BST VLM at Zenith: 5.0 - 5.1 New - Revisited - Failed
Another final process i done the other night. Had the data for a couple weeks now and have had many different versions but this one i enjoy the most. I was able to pull out some of the nice the galactic cirrus dust in this area using new techniques involving luminance layers which i have never used before. Without them i wasnt able to bring any of the IFN to the surface! I cant actually find an image that shows more of the flux nebula than i have here but if anybody knows of one i would be interested in seeing it just to compare. Exposure Details:70* 300 seconds, f7, ISO 800, calibration frames, 805mmScope: Altair Astro 115EDTCamera: Canon 600DaMount: NEQ6
The dark season in Norway is officially over, there is no longer any "astro" dark time during the night. Still, with no moon and a couple of hours with more or less dark skies, i though i might as well give it a go, and it turned out much better then i had though indeed! This is another round with LRGB, where the RGB data was captured with the 550D right before sunrise, and the L data was captured with the QHY Polemaster camera. I've changed my approach a little this time though. Previously I've gone for gain 30 and 60 sec exposure, but seeing as my tracking and seeing were rather poor this night i went for gain 100 and only 15 sec exposures. This resulted in a noticeable sharper end image. I wanted minimal data wasted, so i made 2 stacks. One with 50% best frames, and one with 95% best frames. The 95% best frames image was then only applied for the background to reduce the noise. L data is 605x 15 sec at gain 100 + calibration frames (222x dark, 250x flat, and 500x bias) I only managed to capture 12x 180 sec RGB exposures before the sky got washed out, but any color is better then no color. Total exposure is 3 hours 7 minutes.
A shot of the Type II supernova in the Fireworks Galaxy (NGC 6946) discovered by amateur astronomer Patrick Wiggins on May 14. This animated gif shows two images; one taken on 21 July 2016 and the other taken with a different telescope on 22 May 2017. The difference in quality between the two images is due to the different focal lengths of the two scopes which makes the newer image significantly smaller. 53 x 75 second exposures at 400 ISO 40 x dark frames 79 x flat frames 21 x bias/offset frames (subtracted from flat frames only) Captured with APT Guided with PHD2 Processed in Nebulosity and Photoshop Equipment: Sky-Watcher Explorer-150PDS Celestron NexStar 127 SLT Skywatcher EQ5 Mount Orion 50mm Mini Guide Scope ZWO ASI120 MC imaging and guiding camera Canon 700D DSLR