Celestial hemisphere:  Northern  ·  Constellation: Monoceros (Mon)  ·  Contains:  NGC 2239  ·  NGC 2244  ·  Rosette nebula  ·  The star 12Mon
First Light on Rosette nebula in six UHC subs, 



    
        

            Ewam
First Light on Rosette nebula in six UHC subs
Powered byPixInsight

First Light on Rosette nebula in six UHC subs

Acquisition details

Dates:
Feb. 28, 2015
Frames:
6×310(31′)
Integration:
31′
Avg. Moon age:
10.03 days
Avg. Moon phase:
76.70%

Basic astrometry details

Astrometry.net job: 559511

RA center: 06h31m57s.6

DEC center: +04°5356

Orientation: -99.562 degrees

Field radius: 0.749 degrees

Resolution: 620x876

File size: 555.8 KB

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

Description

Here is my first light on the well known Rosette.

VERSION A : In B&W, to simplify a processing in terrible conditions (no flat made yet, heavy vignette, half moon right above...)

VERSION B : PixInsight editing on the six UHC frames - the gradient HDR compression helped gaining more details, but the Moon 15° or so above my target is just impossible do work with...

That evening, my main goal was M 78 (capturing 1h45min in UHC), but I'm still struggling with the processing, so here is a (simpler?) Rosette nebula that I acquired at the end of my session. The Moon was above the scene, so I get a poor signal to noise ratio. Out 7 frames, one was ruined (still the same issue with my camera) so Iwas left with 5x 300 second plus 1x360 second, all at 6400iso.

Again, this isn't pretty, but I still keep my beginner's "let's share it all" option : here is what you can get with a simple Skywatcher UHC filter, 6 subs, much light pollution and moon...

Next attempt, in a few days under better skies, should be much better ?

RULE N° 722 : SW UHC filters produce halos on brigther stars. On a b&w Rosette, it really does work nicely. Need to gather proper narrow band filters...

Depth of field : down to mag. 16.90 : apparently, UHC filter reduces sensibility by about 1 or 1.5 mag. Or is it also due to the moonshine ?

Comments

Revisions

  • First Light on Rosette nebula in six UHC subs, 



    
        

            Ewam
    Original
  • Final
    First Light on Rosette nebula in six UHC subs, 



    
        

            Ewam
    B

Sky plot

Sky plot

Histogram

First Light on Rosette nebula in six UHC subs, 



    
        

            Ewam