The Bubble Nebula - NGC7635
The Bubble Nebula (NGC7635) is a small Emission Nebula in the constellation Cassiopeia on the northern hemisphere. The "Bubble", which gives the name to this molecular cloud, envolved due to the emission of gas of a big O-star and its star winds. The O-star with the cryptic title BD +60 2522 (SAO 20575) emits large amounts of gas, which are also accelerated by its solar wind. These accelerated gases are colliding with a speed of around 28 kilometers per second with the surrounding molecular cloud, which creates a counter-pressure to the expanding gasses of the star. This process emerges as a shock wave, that is seen as the shell of the bubble.
As the Bubble Nebula isn't that big and because I only have a focal length of 420mm, I tried to make a drizzled image of the bubble itself.
Drizzle is a method of image processing that can, in this case, upscale the resolution of an image. The single frames need to shift slightly from each other so that the algorithm can calculate/interpolate the pixels. This site explains the process very good: http://www.stsci.edu/~fruchter/dither/drizzle.html
Anyway, even the drizzle algorithm is not upscaling images in a perfect way; it also upscales and amplifies noise and other unwanted characteristics.
What else is on the image
In the following picture, I have marked some more or less bright stars and some other interesting objects that are located around the Bubble Nebula. Like the last time, I used the Aladin Sky Atlas suite to identify the stars and objects in the image.
Position in the night sky
As mentioned above, the Bubble Nebula (NGC7635) is part of the constellation Cassiopeia. Cassiopeia can be easily found due to the brightest stars that are aligned as a big W.
Position of the Bubble Nebula in the night sky. Screenshot of SkySafari Plus app for iOS.
Click on the image for a larger view ▲
Details of the image
The picture was taken in my Backyard with the following equipment and settings.
|Telescope||TSAPO65Q · 420mm · f6.5|
|Filter||STC Duo-Narrowband Filter (48mm / 2")|
|Guide scope||TSL60D · 240mm · f4.0|
|Mount||Skywatcher AZ EQ-6|
|Exposure time||31 x 600" = 310 minutes = 5 hours 10 minutes|
|ISO||Unity Gain @ -20°C|
Everything is controlled by my Astro-PC via remote desktop and wireless LAN.
Software: Sequence Generator Pro, PixInsight, Photoshop CC
The license of my pictures
All images, otherwise clearly indicated, in this post are my own work.
You can use it for free if you credit them to @astrophoto.kevin.
Thank you very much for visiting and reading!
If you have any questions or suggestions, please don’t be afraid to let me know of anything you thought about this post in the comments below!
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