Hemisphere:  Northern  ·  Constellation: Draco (Dra)  ·  Contains:  NGC 4236
"Gazing at Dragon's tail - Caldwell 3", 


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

Technical card

Imaging telescopes or lenses: Celestron EdgeHD 800  ·  GSO RC10

Focal reducers: Astro Physics CCDT67

Software: PixInsight  ·  CCDciel  ·  Darktable

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%

Basic astrometry details

Astrometry.net job: 1518761

RA center: 12h 16' 45"

DEC center: +69° 27' 10"

Pixel scale: 0.737 arcsec/pixel

Orientation: 36.828 degrees

Field radius: 0.293 degrees

Resolution: 1824x1423


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 http://www.astrobin.com/users/xordi/ . Go and visit him for another version. I think I'll give it another processing try , maybe with more data.


Sky plot

Sky plot


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