Cepheus: Elephant Trunk to Sharpless 2-129
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| ||Optics:||William Optics Redcat Refractor / 3-frame mosaic|
|Camera:||ASI 1600MM cooled astronomy camera|
|Exposure info:||~ 20 subs / filter / frame, 300 sec exposures|
|Filters used:||Astrodon Halpha, OIII, SII filters|
The mosaic above is a re-do of the image below, using a cooled astronomy camera and narrowband filters. In this case a 3-frame mosaic was required to cover the same field of view. While the resolution is higher and the noise lower in this version, the higher number of frames, longer exposures and darker skies (for the OIII frames) in the image below seem to have given a superior result, at least in showing the elusive Outters 4 Squid Nebula! It seems more subframes and deeper exposures are in order....
|Optics:||Canon 200mm lens f/4|
|Camera:||astro-modified Canon 6D|
|Exposure info:||48 x 600 sec H-alpha iso800, 74 x 600 sec OIII iso1600|
|Filters used:||Astronomik H-alpha, OIII (12 nm)|
An expanse of sky stretching across the bottom of the constellation Cepheus. Included is the Elephant Trunk Nebula inside IC1396 (upper left) and the much fainter Flying Bat Nebula (Sharpless 2-129, lower right), both emission nebula rich in ionized hydrogen. The image was shot entirely through narrowband filters; the H-alpha taken from light-polluted Maryland, while the Oxygen III frames were taken from Cape Hatteras, North Carolina, where the skies are considerably darker. Faintly visible inside the red Sharpless 2-129 at lower right is the very dim Squid Nebula (Ou4), which appears as an elongated ghost of teal in the shape of a squid. The Squid Nebula was only discovered in 2011 by Nicolas Outters. The image is a composite of 20 hours of exposure, my longest effort yet. My goal was to try and capture the faint squid, which I did, although just barely!