Nebulas

Tue, 22 Oct 2024 19:13:56 +0200

Raw Stacks

North American Nebula NGC 7000

This image shows a widefield view of the North American and Pelican Nebula are in Cygnus. It was acquired with a 20 EUR Sigma zoom lens at 195mm focal length (stopped down to f/7 for better quality) and a unmodified Nikon D3400. A ZWO Duoband filter was placed in front of the lens. Everything was mounted on a AZ-GTI in EQ mode. I collected data on three nights, some of the Ha data was captured in astronomical twilight.

Processing was done in a special way. Since the duoband filter passes light at Ha and OIII wavelength (12nm and 30nm width) I seperated the RAW data into its individual Bayer matrix components using SplitCFA in PixInsight: Red was assigned to Ha, Green to OIII and Blue also to OIII. The oxygen signal ends up in the blue and green channel because for a typical Bayer matrix, both color channels have a significant overlap. This allows to do a freestyle HOO color combination when processing.

Raw stack from PixInsight can be downloaded here. The zip files contains a stack of the red channel as Ha (132x 300s) and blue/green as OIII (195x300s).

My processed imaged with details can be found on Astrobin. You can read about the this galaxy here on Wikipedia.

Little Dumbell Nebula M 76

The Little Dumbell Nebula M76 is one of the smaller yet interesting objects

This image was done with a Celestron C8, the original 0.63x reducer/corrector and an ASI533MC (uncooled). Everything was mounted on a Skywatcher HEQ5 (with Rowan Belt Mod) together with 15 kg of counterweights on my backyard pier. Integration time is a 6.5 hrs from a single night.

Raw stack from PixInsight can be downloaded here. It was calibrated with bias and flat frames. Standard settings from WBPP (2024) were used, incl. CFA drizzle at scale 1. It is slightly oversampled. This is 131x 180s at gain 101.

My processed imaged with details can be found on Astrobin. You can read about the this galaxy here on Wikipedia.

Galaxy on Cosmic Homebrew

Nebulas

Raw Stacks

North American Nebula NGC 7000

Little Dumbell Nebula M 76