Celestial hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  M 101  ·  NGC 5457  ·  NGC 5473  ·  NGC 5474  ·  NGC 5477
First light on a galaxy : M 101, 


First light on a galaxy : M 101
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First light on a galaxy : M 101

Acquisition details

Feb. 16, 2015
17×170(48′ 10″)
48′ 10″
Avg. Moon age:
26.65 days
Avg. Moon phase:

Basic astrometry details

Astrometry.net job: 545070

RA center: 14h03m29s.8

DEC center: +54°1850

Pixel scale: 1.018 arcsec/pixel

Orientation: 97.428 degrees

Field radius: 0.803 degrees

Resolution: 620x379

File size: 158.6 KB

Locations: La Gueule du Loup (Malonne), Namur, Namur, Belgium


Tonight has been a rich session - my second with new mount under the sky ! More data (much more) for M42, but that will have to wait. I got curious, as usual : "what would come out of M78?", "Sure I can do better with the Flame !?", "Oh the pretty globular cluster...", "IC1805, the soul isn't it? Let's take some...".

In the end I gathered enough material to keep me busy during cloudy nights. So I decided to start a first editing at the last object I imaged : M 101.

8x O-III (I do need other filters, I know!) - longer exposures of up to 426 sec (not automatic, so I count and get distracted).

9x Lum (how do you call it : just plain light into the camera) of 30 sec each.

Depth of field : better than mag. 16.50 !

Used PixInsight a bit more.

Again, this doesn't look too pretty, but I'm sure with some friend's help and hard work, I'll improve :-)



Sky plot

Sky plot


First light on a galaxy : M 101,