Bubble Nebula - NGC 7635
Description By "Sakib Rasool"
"This dramatic image shows the Bubble Nebula in the constellation of Cassiopeia. It is a windblown bubble caused by the stellar activity of an O-type star, which is the white star that can be seen above and to the left of the centre of the bubble. Images such as this one that isolate the specific light of oxygen and hydrogen gas with specialized Ha and OIII filters render this cosmic scene in exquisite detail. A second false color image further accentuates the chemistry of this region with the colors of the narrowband filters mapped according to a scheme known as the Hubble palette, named after the space telescope, which first utilized this approach in the 1990's. The bubble has a size of 7 light years and is embedded in the emission nebula Sh2-162 at a distance of about 7000 light years."
Taken with a PlaneWave CDK 700 with exposure times as follows: Lum-180min, Red-120min, Green-180min, Blue-180min, S2-290min, O3-250min, HA-240min. Total of 780 min or 13 hours.
The first image is LRGB with HA and O3 added, the second image is a Hubble palette color map version, with RGB stars.