Eta Carinae Nebula (Brendan Studds)

Celestial hemisphere: Southern · Constellation: Carina (Car) · Contains: Carina Nebula · IC 2599 · NGC 3324 · NGC 3372 · eta Car Nebula

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Eta Carinae Nebula

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Eta Carinae Nebula

Technically not first light with my new telescope but close enough. Second time I've imaged using my new Sharpstar 61EDPH to collect some more data of Carina. I'm blown away how much difference there is between the admittedly small telescope and my DSLR lens.

First time I've experimented with using a pseudo luminance layer (using the red channel from my RGB data) for giggles.

# Equipment

* HEQ5 Pro

* Sharpstar 61EDPH + f/4.5 reducer (274mm focal length)

* Nikon D5600

* Astrophotography Tool, SiriL, Gimp

# Imaging

* 2020-06-10: 168 x 60" subs @ISO200, 50 darks, 30 flats, 60 bias

* 2020-06-12: 75 x 60" subs @ISO200, 50 darks, 30 flats, 60 bias

It was quite cloudy on the 12th, about 20 of the subs contain significant cloud but I stacked them anyway.

# Processing

* Stacked in Siril

* Siril: photometric colour calibration, remove green noise, and background extraction

* Gimp:

** Stretched via levels and curves

** Extracted red layer to use a luminance layer

** Luminance layer: nudged contrast and brightness slightly to even out background/stars and highlight the nebula, sharpen via unsharp mask, erode tool to reduce stars

** Combined RBG and lum: Highpass filter with star mask to bring out nebula, another erode to reduce stars, adjust blackpoint

Southern Hemisphere Astro

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