NGC 4490, the Cocoon Galaxy, is a barred spiral galaxy in the constellation of Canes Venatici which forms an interacting pair of galaxies together with with neighbour, NGC 4485. They are connected by a tidal arm that reaches into space by about 24,000 light-years.
Another narrow-band image series taken from my backyard in Vienna, Austria: The faint nebulosity around Lynd's Bright Nebula 310 in Cygnus, a few degrees west of Deneb, the constellation's brightest star. Again, I used Hα, [OIII] and [SII] filters to image those emission lines exclusively during six different nights in the summer of 2012. See the Hα image and the "near-natural" color image. I used the 125/475mm Wright-Newtonian telescope and the ATIK 383L+ CCD for this exposure series.
In October 2011, I took narrow-band images of IC 1318, the Butterfly Nebula, in my light-polluted backyard in Vienna, Austria, using the 9.5" Newtonian telescope at a local length of about 1300mm. I used Hα, [OIII] and [SII] filters to image those emission lines exclusively in three succeeding nights. As usual, the Hα image turned out best, with most contrast and details but least noise. However, I used all the emission lines to create an image with "near-natural" colors. I used my trusty ATIK 383L+ CCD for this exposure series
Walter created a 4K timelapse animation of the Total Lunar Eclipse of January 21, 2019 (YouTube link). The images were taken with Walter's TMB 105/650 refractor and his ZWO ASI294MC Pro color CMOS camera. The sequence starts during the penumbral phase and lasts during the full total eclipse phase until the moon sets behind a tree just after 4th contact in the morning sky. This is the stablized, enhanced version, where you can see the stars moving in the background.
January 1st, 2019: Howdii's Farewell and a Happy New Year!
Walter used his new ZWO ASI294MC color CMOS camera to take Hα and [OIII] narrow-band filtered images of NGC 6888, the Crescent Nebula in his light-polluted backyard in Vienna, Austria. The camera's Bayer matrix reduces the available resolution when using narrow-band filters, but much of this could be restored using the 2x drizzle method. The resulting Hα and [OIII] images were combined to create a Near-Natural Color Image using tone mapping. The telescope used is a 9.5" f/4.9 Newtonian with a new TS-Optics 2" 3-element MaxField Newtonian coma corrector.
A telelens photo taken by Walter last summer showing IC 1396, a huge emission nebula in southern Cepheus, and its surrounding area. Move your mouse over the image above to get a version with constellation lines, deep-sky objects and labels drawn.
Walter's first image taken with the STC Astro Duo-Narrowband Filter, which enables astrophotographers to capture two narrowband emission lines (Hα and [OIII]) simultaneously. This makes emission nebula photography with a one-shot-colour cooled camera or DSLR possible even under the light-polluted sky of a city. My first impressions: It works quite well, but I needed a long exposure series spanning two nights to get enough signal at f/6.2 for a decent image. I capured both red and green colored parts of IC 1795, the Fishhead Nebula simultaneously with my color CMOS camera under the light-polluted sky of my backyard in Vienna/Austria. I used my TMB 105/650 APO refractor for taking the exposures.
Walter's widefield DSLR photos taken with a Canon 350D and an astro-modified Canon 350D and a Nikon 135mm telephoto lens during his XVIth Astro-Expedition to the Großglockner-Hochalpenstraße:
Walter's astrophotos of the 3rd night of his stay at the Großglockner-Hochalpenstraße in September 2018, taken with his well-tried photoscope the JSO 4.9" f/3.8 Wright-Newtonian and the new ZWO ASI294MC Pro color CMOS camera:
Ok, here are the processed astrophotos Walter has taken with Howdii's Alpha Tauri 8" f/5 Photo-Newtonian and the ZWO ASI294MC Pro camera during his XVIth Astro-Expedition to the Großglockner-Hochalpenstraße:
Walter┤s report of his XVIth Astro-Expedition to the Großglockner-Hochalpenstraße, featuring Howdii's newly-presented Alpha Tauri 8" f/5 Photo-Newtonian and a brand- new ZWO ASI294MC Pro color CMOS camera, both of which he used during the expedition, not without some troubles. He had mostly clear skies, with occasional thin clouds passing through, during the 3 nights he stayed there. Read for yourself, in German, September 2018!
During a warm and dry summer night in August 2018, Walter took Hα and single-shot color images of a large part of IC 1396, a huge, primarily photographic emission nebula in Cepheus. He used them to create a HαRGB composite. The scope was Walter's 4.9" f/3.8 Wright-Newtonian and the location Ebenwaldhöhe, Lower Austria.
Walter used the fine weather during the October 2017 new moon period to capture IC5070, the Pelican Nebula from his backyard in Vienna with narrow-band filters: Hα, [OIII] and [SII]. He used five nights to capture the individual exposures and created a near-natural-color image using the narrow-band composites. See also the Hα version in black-and-white. He used his 4.9" f/3.8 Wright-Newtonian and a monochrome CCD to take all exposures. The Hα image shows labels of LBN and LDN objects on mouse-over.
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