Cookie consent

AstroBin saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing AstroBin without changing the browser settings, you grant us permission to store that information on your device.

I agree
Contains:  NGC 4236
Getting plate-solving status, please wait...
"Gazing at Dragon's tail - Caldwell 3", 


"Gazing at Dragon's tail - Caldwell 3"

"Gazing at Dragon's tail - Caldwell 3"

Technical card

Imaging telescopes or lenses:Celestron EdgeHD 800GSO RC10

Focal reducer:Astro Physics CCDT67

Software:CCDcielDarktablePleiades Astrophoto PixInsight

Resolution: 2256x1760

Dates:Jan. 21, 2017Jan. 26, 2017Feb. 7, 2017March 27, 2017

13x900" bin 1x1
25x400" bin 2x2
Hutech IDAS 2" LPS P2: 78x300" bin 1x1

Integration: 12.5 hours

Avg. Moon age: 22.86 days

Avg. Moon phase: 30.76% job: 1518761

RA center: 184.190 degrees

DEC center: 69.453 degrees

Pixel scale: 0.737 arcsec/pixel

Orientation: 36.828 degrees

Field radius: 0.293 degrees


Caldwell 3 or NGC 4236 located in Draco. A 11MLY distant, barred spiral galaxy with a diameter of 75.000 lightyears. It's a part of M81 Group and contains more than 100 billion stars. Not far from edge on, it spans 22' x 7' making it a nice big, target for us. Although it is pretty faint , so prepare to gather lot of photons.
In the background lot of distant , "tiny" galaxies are visible. Some seem to interact with each other.


The data comes from a co-operation with . Go and visit him for another version. I think I'll give it another processing try , maybe with more data.



License: Attribution-NonCommercial-ShareAlike Creative Commons

Sky plot

Sky plot


"Gazing at Dragon's tail - Caldwell 3",