PK158+37.1 - A (very) faint Planetary Nebula in Ursa Major in Halpha (Daniel.P)

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: PK158+37.1

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PK158+37.1 - A (very) faint Planetary Nebula in Ursa Major in Halpha

Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)

Powered byPixInsight

PK158+37.1 - A (very) faint Planetary Nebula in Ursa Major in Halpha

Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)

I wanted to test the possibility to image faint object from my garden near Paris ...

This planetary nebula was acquire under a 18.5 SQM average sky with bright moon.

I have Ha filter only, since the signal was already at the limit of detection.

Some figures : each individual exposures of 600 s gathered 38 e-/ pixel (3.8µ) from the background and only 0.3 e- from the nebula thru the Ha filter, i.e. 0.75% of the filtered background.

A 18.5 SQM sky shine around 3000 e-/pix over the full visible spectrum for 600s. The nebula is therefore around 10 000 times less luminous in Ha than the total sky background ....

The 65 exposures get only 20 e-/pix for 10hours exposures from the nebula. The noise in the final image is 47 e/pix. The nebula cannot be detected at the pixel scale. To obtain a SNR=5, we need a 12x12 pix area of the nebula. The nebula extension is around 350 pixels across. The overall the nebula is SNR = 30.

Hope I did not bore you too much with my figures ....

Version B is without denoising (mure, MSLTkFiltering, TGV), for comparison.

The processing was performed in PI as follows :

For H channel :

- Images Calibration (Dark and Flat )

- Cosmetic Correction

- Image Registration

- Image Integration

- Mure Denoise

- MultiScaleLinearTransform K filtering

- ABC & DBE

- Deconvolution of Ha channel

- Going NL using HT

- TGV denoise (no mask)

Final image adjustments performed in Photo on Imac :

- levels adjustments

- crop and deflip

Final
Original
B

B

Description: Without De Noising

Uploaded: ...

ZWO ASI1600MM/QHY163M

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Status	Advanced success
Started	...
Astrometry.net job	3479141
PixInsight job	LHN1XA05ECJ7NATYL9FWNZ5K4VKE6AM3
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	08h41m36s.213
RA (top/left)	08h46m03s.107
RA (top/right)	08h37m18s.324
RA (bottom/right)	08h37m15s.129
RA (bottom/left)	08h45m47s.790

Dec (center)	+58°13′11″.88
Dec (top/left)	+58°37′05″.51
Dec (top/right)	+58°38′44″.48
Dec (bottom/right)	+57°48′44″.90
Dec (bottom/left)	+57°47′03″.67

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PK158+37.1 - A (very) faint Planetary Nebula in Ursa Major in Halpha

PK158+37.1 - A (very) faint Planetary Nebula in Ursa Major in Halpha

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PK158+37.1 - A (very) faint Planetary Nebula in Ursa Major in Halpha

PK158+37.1 - A (very) faint Planetary Nebula in Ursa Major in Halpha

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