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Outters 4 and SH2-129, 



    
        

            psemil

Technical card

Imaging telescopes or lenses: Takahashi FSQ 85 EDX

Imaging cameras: Moravian Instrument Moravian G3-16200

Mounts: ASA DDM60


Dates:Sept. 5, 2018

Frames:
Astrodon Ha 2" 3nm: 41x1800" -20C bin 1x1
Astrodon O3 2" 3nm: 59x1800" -20C bin 1x1

Integration: 50.0 hours

Avg. Moon age: 24.71 days

Avg. Moon phase: 24.08%

Bortle Dark-Sky Scale: 5.00

Temperature: 22.00


Basic astrometry details

Astrometry.net job: 2499068


Resolution: 1812x2262

Data source: Backyard

Description

I have imaged very dim nebulas, like Cocoon and Eagle Head, but I have never seen a nebula which is invisible in 30' subs... The first glimpse of this nebula are seen after 5 hours of integration.
The Ha nebula is a little brighter , but not as bright as expected so I found that showing details of it was never going to be easy.
I imaged most of the data in holiday in Greece, but because the moon during that span was decreasing from 80% to 20%, to make most of the clear sky, I imaged almost all Ha data with the moon low in the sky and the O3 data without the moon presence.

A procesed and calibrated 30' exposure is also presented.

Description:
Very faint but also very large on planet Earth's sky, a giant Squid Nebula cataloged as Ou4, and Sh2-129 also known as the Flying Bat Nebula, are both caught in this cosmic scene toward the royal constellation Cepheus. Discovered in 2011 by French astro-imager Nicolas Outters, the Squid Nebula's alluring bipolar shape is distinguished here by the telltale blue-green emission from doubly ionized oxygen atoms. Though apparently completely surrounded by the reddish hydrogen emission region Sh2-129, the true distance and nature of the Squid Nebula have been difficult to determine. Still, a recent investigation suggests Ou4 really does lie within Sh2-129 some 2,300 light-years away. Consistent with that scenario, Ou4 would represent a spectacular outflow driven by HR8119, a triple system of hot, massive stars seen near the center of the nebula. The truly giant Squid Nebula would physically be nearly 50 light-years across.
Source: Apod

The image was AAPOD on 25 august 2019

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psemil
psemil
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Revisions

  • Outters 4 and SH2-129, 



    
        

            psemil
    Original
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  • Final
    Outters 4 and SH2-129, 



    
        

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    L

L

Description: Better star color version...

Histogram

Outters 4 and SH2-129, 



    
        

            psemil