Hemisphere:  Southern  ·  Constellation: Eridanus (Eri)  ·  Contains:  NGC 1909  ·  Part of the constellation Eridanus (Eri)  ·  The star 62Eri  ·  The star 63Eri  ·  The star 66Eri  ·  The star 68Eri  ·  The star Cursa (βEri)  ·  The star Rigel (βOri)  ·  The star λEri  ·  The star τOri  ·  The star ψEri  ·  The star ωEri  ·  the Witch Head Nebula
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NGC1909 - LRGB - The Witch's Head and Environs, 



    
        

            andrea tasselli
NGC1909 - LRGB - The Witch's Head and Environs
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NGC1909 - LRGB - The Witch's Head and Environs

Getting plate-solving status, please wait...
NGC1909 - LRGB - The Witch's Head and Environs, 



    
        

            andrea tasselli
NGC1909 - LRGB - The Witch's Head and Environs
Powered byPixInsight

NGC1909 - LRGB - The Witch's Head and Environs

Technical card

Dates:Feb. 7, 2021

Frames:
6x300" (30') bin 1x1
3x600" (30') bin 1x1

Integration: 1h

Avg. Moon age: 25.09 days

Avg. Moon phase: 20.68%

Bortle Dark-Sky Scale: 1.00


Basic astrometry details

Astrometry.net job: 4241123

RA center: 5h 5' 5"

DEC center: -7° 16' 26"

Pixel scale: 6.294 arcsec/pixel

Orientation: 180.259 degrees

Field radius: 5.038 degrees


Resolution: 4500x3600

Data source: Amateur hosting facility

Remote source: ChileScope

Description

The Witch's Head (or the Hag's Head as it is otherwise known) has been on my imaging wish list for ages. So tantalising close yet so far away in terms of imaging possibilities from a northern, Bortle 5/6 sky. After so many years of musing what it would look like I decided to scratch that itch and be done with it, although with remote observing half of the pleasure is gone. Even in the pristine skies of northern Chile, right in the middle of nowhere, I still had to fight gradients although half of them are probably due to Rigel itself. The Nikkor optics defends itself quite well until you get toward the lower left corner where coma rears its ugly head. One thing that I was surprise with and unprepared for was this amount of blue halo-ing, which I didn't expect from Nikon famed coatings (the nano-crystal thingy) and had a hard time to keep from blooming to enormous proportion. Finally, I wasn't expecting the low-level H-alpha emission that permeates the field and decided to lower it a notch or two to give the image a more "classical" look.

The image is a LRGB composite of 3x600s luminance integrations and 2x300s integrations for each of the RGB filters taken with a Nikon Nikkor 200mm f/2 VR ii and a FLI Microline 16200

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NGC1909 - LRGB - The Witch's Head and Environs, 



    
        

            andrea tasselli