The Bubble Nebula - NGC7635

in #steemstem3 years ago

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.

The Bubble Nebula captured with a focal length of 420mm.
Click on the image for a larger view ▲

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:

The Bubble Nebula drizzled by a factor of 2
Click on the image for a larger view ▲

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.

Image with names of some objects/stars. Created by hand in Photoshop.
Click on the image for a larger view ▲


As you can see, there are a lot of objects in the image. One of them is the Open Star Cluster Messier 52, which contains more than 600 stars and has a mass of around 1,200 solar masses. One other is the Emission Nebula NGC7538, which contains the biggest ever discovered Protostar until now. It is about 300 times bigger than our Solar System. You can also see some gigantic clouds of gas and dust named the Lobster Claw Nebula and Sharpless 161.


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.

Camera QHYCCD247C
Telescope TSAPO65Q · 420mm · f6.5
Filter STC Duo-Narrowband Filter (48mm / 2")
Guide camera QHY5L-II
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.

CC BY-SA 4.0 Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)




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!

Yours, @astrophoto.kevin



SteemSTEM is a community project with the goal to promote and support Science, Technology, Engineering and Mathematics on the Steem blockchain. If you wish to support the steemSTEM project you can:

Contribute STEM content using the #steemstem tag | Support steemstem authors | Join our curation trail | Visit our Discord community | Delegate SP to steemstem

Convenient Delegation Links:

50 SP | 100SP | 500SP | 1,000SP | 5,000SP | 10,000SP | 50,000SP


Hallo Kevin, deine Astrophotos sind wie immer total beeindruckend! Da steckt eine ganze Menge Arbeit dahinter! Vielen Dank dafür!

@tipu curate

Vielen Dank für deine netten Worte lieber Peter :-)
Ich habe zu danken :-)

Ich bin immer wieder begeistert von deinen Bildern.

Vielen Dank @dreimaldad :-)

Thank you for this guided voyage to the skies. First blog I looked at this morning. Nice way to start--the wonder of the universe :)

Thank you very much for your kind words @agmoore2 :-)
Nothing to thank for, I have to thank for your nice comment :-)

Some mornings I love Steemit. This is one of those mornings. I 'meet' the nicest people :)

Aww... Thank you :-)
I can only say that in return. Really nice to hear something at the end of the day :-)

Hi, thanks for another great post! I really like all of your astrophotography posts. I have included it in my daily Science and technology digest, and you'll receive a 10% share of that post's rewards.

Nothing to thank for @remlaps-lite, I have to thank you for your kind words and your awesome support :-)


This post has been manually curated, resteemed
and gifted with some virtually delicious cake
from the @helpiecake curation team!

Much love to you from all of us at @helpie!
Keep up the great work!


Manually curated by @rem-steem.

@helpie is a Community Witness.

Thank you very much @helpiecake and @rem-steem :-)

You got a 33.33% promotion boost from @shares courtesy of @actifit-peter! Thank you for following @Shares rules of promoting your articles.

Have a nice day.
@Shares - Keep steeming good articles to help Steem network grow.

Thank you very much @shares and @actifit-peter :-)


Your post has been manually curated by a @stem.curate curator.

Supporting Steemians on STEMGeeks

We are dedicated to supporting great content, like yours on the STEMGeeks tribe.

Please join us on discord.

Thank you :-)