IC410, Tadpole Nebula - HOO, SHO, Ha

[Vesmaobs261]

Hi Dave,
Glad to be of service.
Looking forward to your future images.
George.

[turfpit]

Last night I managed to capture a further 15 frames of Ha and 10 frames of OIII - all at 450s. This takes the total integration to 8.75h (30 Ha & 40 OIII). Every frame was dithered during capture and drizzle 2x was used during integration, giving a pixel scale of 1.56 arcsec/pixel (down from 3.11).

HOO_mode2_final2.jpg (462.3 KiB) Viewed 825 times

MultiscaleLinearTransform was used at the linear stage for noise removal in the first 4 layers. Linear mask inversion was used to apply noise reduction only to the darkest areas.

This is a close up of the centre of the image. With more data and more exposure (no pun intended) to noise reduction techniques, the centre of the Starnet++ starless version looks like this:

noise_reduction.JPG (46.13 KiB) Viewed 825 times

This is an Ha only version, showing how much Ha contributes to the overall image.

Ha_final.jpg (433.91 KiB) Viewed 825 times

Dave

[turfpit]

This is a rework of the SHO version - SII 18x450s, Ha 15x450s, OIII 30x450s (7.8h total) - integration with drizzle_2x.

SHO_final.jpg (475.23 KiB) Viewed 727 times

Plus a close-up of the central region. Denoise was applied via MultiscaleLinearTransform immediately after ChannelCombination while the SHO image was at the linear stage.

noise_close_up.JPG (60.97 KiB) Viewed 727 times

Next task will be to capture some RGB stars and hopefully more SII.

Dave

[oopfan]

Beauty!!

Can't wait for the soon-to-come RGB stars!

[turfpit]

I have reworked this and documented the steps in the hope it may help others process noisy data. First the result from processing 30 x Ha and 40 x OIII.

HOO_final.jpg (503.18 KiB) Viewed 647 times

These 4 parts document the processing of the Ha and OIII stacks to produce the image above.

IC410_HOO - Part_1.pdf

(436.51 KiB) Downloaded 29 times

IC410_HOO - Part_2.pdf

(563.52 KiB) Downloaded 25 times

IC410_HOO - Part_3.pdf

(577.83 KiB) Downloaded 29 times

IC410_HOO - Part_4.pdf

(678.78 KiB) Downloaded 31 times

Brian (@oopfan) - the RGB stars will be along as soon as the weather permits.

Dave