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Revisiting Elephant's Trunk Nebula, 





    
        

            Min Xie

Revisiting Elephant's Trunk Nebula

Technical card

Resolution: 3360x2675

Dates:July 25, 2019July 26, 2019July 27, 2019July 28, 2019July 30, 2019July 31, 2019Aug. 1, 2019Aug. 10, 2019Aug. 11, 2019Aug. 12, 2019Aug. 13, 2019

Frames:
Astrodon 3nm Ha 31mm: 144x300" (gain: 139.00) -10C bin 1x1
Astrodon 3nm OIII 31mm: 192x300" (gain: 74.00) -10C bin 1x1
Astrodon 3nm SII 31mm: 192x300" (gain: 139.00) -10C bin 1x1
Astrodon E Series Gen II Blue 31mm: 96x31" -10C bin 1x1
Astrodon E Series Gen II Green 31mm: 75x38" -10C bin 1x1
Astrodon E Series Gen II Red 31mm: 60x60" -10C bin 1x1

Integration: 46.6 hours

Darks: ~40

Flats: ~40

Bias: ~60

Avg. Moon age: 18.11 days

Avg. Moon phase: 43.63%

Bortle Dark-Sky Scale: 9.00

Mean SQM: 18.00

Temperature: 32.91

Astrometry.net job: 3248745

Locations: Backyard, Coppell, Texas, United States

Data source: Backyard

Description

This is the second "All-Backyard" project - all the data captured at home, including narrowband channels and RGB channels. By far this is the largest backyard project I've ever attempted, with total 46 hours of data. Plus the discarded frames, the project easily tops 50 hours of imaging, all from Bortle class 9 backyard in Texas summer nights (at this very moment, it's 36C at 9pm. The ASI1600mm-Pro can only go down to -8C with 100% cooling effort. Geez...). The data was collected over 11 nights between 07/25/2019 and 08/13/2019. Can't believe it's done... :)

Learned a lot from the discussions with my APer buddies. The RGB star layer improved dramatically and became much easier to control in post processing. As of the narrowband colors, I still prefer to have more red presenting the H-alpha channel. Maybe it's just me.

A SHO alike version created with the same set of data, different cropping: Elephant's Trunk Nebula in Hubble Palette.

Can‘t wait for the dark site visits to Atoka during Labor Day! Fingers crossed!

Comments are welcome!
Western Veil will be the next target.

Pre-processing of Narrowband Masters

- Calibration / Integration, Astro Pixel Processor
- Deconvolution, PixInsight (Only for H-Alpha)
- MultiscaleMedianTransform (Denoise), PixInsight
- ScreenTransferFunction / HistogramTransformation, PixInsight.

Pre-processing of RGB Masters

- Calibration / Integration, Astro Pixel Processor
- Dynamic Background Extraction, PixInsight
- MorphologicalTransformation, PixInsight
- ScreenTransferFunction / HistogramTransformation, PixInsight.

RGB Combination

- LRGBCombination, PixInsight
- MorphologicalTransformation, PixInsight
- ScreenTransferFunction / HistogramTransformation, PixInsight.

Narrowband Combination

- SHO-AIP Script, PixInsight
- ScreenTransferFunction / HistogramTransformation, PixInsight.

Narrband & RGB Combination
- Star adjustment, Lightroom
- Final Touch-up, Photoshop

Comments

Author

mxcoppell
Min Xie
License: Attribution-NonCommercial Creative Commons
3762
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Histogram

Revisiting Elephant's Trunk Nebula, 





    
        

            Min Xie