Hemisphere:  Northern  ·  Constellation: Hercules (Her)
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New Discovery: Patchick-Morefield 1 | A Planetary Nebula, 



    
        

            Kevin Morefield
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New Discovery: Patchick-Morefield 1 | A Planetary Nebula

Getting plate-solving status, please wait...
New Discovery: Patchick-Morefield 1 | A Planetary Nebula, 



    
        

            Kevin Morefield
Powered byPixInsight

New Discovery: Patchick-Morefield 1 | A Planetary Nebula

Imaging Telescopes Or Lenses
Planewave CDK14
Imaging Cameras
QHYCCD QHY600PH M
Mounts
Planewave L-350
Filters
Astrodon Blue · Green · Astrodon OIII 3 nm · Red · Astrodon Ha 5 nm
Software
Adobe Photoshop · Topaz Labs DeNoise AI · PixInsight · CCDWARE CCD Autopilot 5
Guiding Telescopes Or Lenses
Planewave CDK14
Guiding Cameras
Starlight Express UltraStar Mono

Acquisition details

Dates:
May 28, 2021
Frames:
Astrodon Blue: 13x300" (1h 5') (gain: 56.00) -10°C bin 1x1
Astrodon Ha 5 nm: 141x600" (23h 30') (gain: 56.00) -10°C bin 1x1
Astrodon OIII 3 nm: 167x600" (27h 50') (gain: 56.00) -10°C bin 1x1
Green: 13x300" (1h 5') (gain: 56.00) -10°C bin 1x1
Red: 13x300" (1h 5') (gain: 56.00) -10°C bin 1x1
Integration:
54h 35'
Darks:
20
Flats:
20
Avg. Moon age:
17.12 days
Avg. Moon phase:
93.87%
Bortle Dark-Sky Scale:
3.00

RA center: 18h30m05s.134

DEC center: +14°1613.45

Pixel scale: 0.609 arcsec/pixel

Orientation: 58.937 degrees

Field radius: 0.229 degrees

More info:Open 

Resolution: 2275x1463

Data source: Own remote observatory

Remote source: Sierra Remote Observatories

Description

I generally like to upload only my pretty pictures to Astrobin, but since this is the best (and only) picture of this object I hope you will forgive my indulgence.

I was contacted by Planetary Nebula hunter extraordinaire, Dana Patchick about the possibility of partnering to find new PNs and begin a catalog. Dana combs the Galex catalog and POSS II sky survey plates to look for any hints of a nebula in stars with the correct temperature profiles. We decided to devote 50 hours of scope time to see if we could turn up something new.

You can find PaMor1 listed here: http://planetarynebulae.net/EN/page_np.php?id=1030

PaMor1 is 5.6 arc minutes in size and, based on the DR3 parallax catalog, 1424 parsecs distant. There appear to be two spheres, both mostly represented in OIII. The Ha data only presented a hint of the nebula. The star that has produced the gas sphere can be seen dead center and shows very blue in both NB and RGB.

As this was my first time at this extreme astrophotography I learned a lot. Here is a list of those learnings:

1) My calibration process was flawed - OK for normal objects but I was losing fidelity in my backgrounds and detail near the noise floor

- CCDAP had defaulted my Maxim download speed to fast and this needed to be changed to normal

- I increased my offset from 10 to 50 to make more room for dark noise variation

- Critically, I began adding a pedestal in the WBPP script to ensure no <0 pixels were created via dark subtraction (check your calibrated subs for 0 pixels folks)

- I began shooting flats with rotation angles to match lights. The variation is only an ADU or two but my stacked signal is only an ADU or two above the noise

floor

2) I compared my 1x1 and 2x2 dark calibration and it appeared that the calibration was more accurate at 1x1. It may seen odd to choose 1x1 for really dim objects, but with my CMOS camera the SNR improvement from binning can come either before or after calibration. This would not be the case with CCD of course.

3) I learned an even greater respect for the work being done by the Strottner-Drechsler team. This is hard and they make it look easy!

4) An F7 system is not ideal for this hunt! PaMor1 would probably look much better shot with my FSQ106 than my CDK14.

5) Bortle 3 is good for most objects but imagine how much easier achieving a decent SNR would

be in Bortle 1.

6) Narrowband for normal objects work with the Moon up but not this low light work. This was

shot mostly with my LRGB time.

I added a bit of RGB data to provide a better star color. But with the extreme stretching that color is not strong. The NB mix is [Ha - Ha*.1+OIII*.9 - OIII]

Amateurs, it seems, still have a contribution to make. On to the next object!

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    New Discovery: Patchick-Morefield 1 | A Planetary Nebula, 



    
        

            Kevin Morefield
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New Discovery: Patchick-Morefield 1 | A Planetary Nebula, 



    
        

            Kevin Morefield

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