Archives for February 2022

Telescope: Astro-Tech 8” f/8 Ritchey-Chretien, Orion Atlas EQ-G

Camera: Canon EOS Ra, Baader Mk III MPCC

Filter: Orion Imaging Skyglow Filter

Guide scope: Astro-Tech 60mm, Starlight Xpress Super Star, PHD2

Exposure: 62x60sec, ISO 800, saved as RAW

Darks: Internal (Long Exposure Noise Reduction On)

Flats: 32×1/125sec, Tee shirt flats taken at dusk

Average Light Pollution: Red zone, Bortle 8, poor transparency

Lensed Sky Quality Meter: 18.4

Stacking: Mean with a 1-sigma clip.

White Balance: Nebulosity Automatic

Software: Backyard EOS, Deep Sky Stacker, Nebulosity, Photoshop

NGC 1535 is a beautiful bright planetary nebula in Eridanus. It clearly shows a shelled structure very similar to the Eskimo Nebula (NGC 2392). These little planetary nebula make fine visual targets and are among the few deepsky objects that show a beautiful blue color.

NGC 1535 is currently well placed in the south during the early evening.

Telescope: Astro-Tech 8” f/8 Ritchey-Chretien, Orion Atlas EQ-G

Camera: Canon EOS Ra, Baader Mk III MPCC

Filter: GSO IR blocking filter

Guide scope: Astro-Tech 60mm, Starlight Xpress Super Star, PHD2

Exposure: 32x60sec, ISO 800, saved as RAW

Darks: Internal (Long Exposure Noise Reduction On)

Flats: 32×1/2sec, Tee shirt flats taken at dusk

Average Light Pollution: Red zone, Bortle 8, poor transparency

Lensed Sky Quality Meter: 18.2

Stacking: Mean with a 1-sigma clip.

White Balance: Nebulosity Automatic

Software: Backyard EOS, Deep Sky Stacker, Nebulosity, Photoshop

For a long time there was some debate as to whether the two clusters that make up the Double Cluster are actually associated with each other or just happened to appear in the same line of sight with one lying behind the other. It now appears that they are indeed lying next to each other, each about 7,000 light years away and about 100 light years apart. However, there is some evidence that the two clusters are of different ages, so while they may have formed separately from each other, they are now traveling companions.

I normally crop these images to give a 4:3 aspect ratio, but I left this one as it came out of the camera to show how well the RC8 covers a full frame sensor. The Double Cluster is currently high in the northwest after sunset.

Telescope: Astro-Tech 8” f/8 Ritchey-Chretien, Orion Atlas EQ-G

Camera: Canon EOS Ra, Baader Mk III MPCC

Filter: Orion Imaging Skyglow Filter

Guide scope: Astro-Tech 60mm, Starlight Xpress Super Star, PHD2

Exposure: 20x120sec, ISO 800, saved as RAW

Darks: Internal (Long Exposure Noise Reduction On)

Flats: 32×1/125sec, Tee shirt flats taken at dusk

Average Light Pollution: Red zone, Bortle 8, poor transparency

Lensed Sky Quality Meter: 18.0

Stacking: Mean with a 1-sigma clip.

White Balance: Nebulosity Automatic

Software: Backyard EOS, Deep Sky Stacker, Nebulosity, Photoshop

NGC 253 is a large, beautiful spiral galaxy located in the faint southern constellation of Sculptor. Although it is one of the brightest galaxies in the sky, it is so far south that it is relatively difficult from mid-northern latitudes. From my backyard it never gets much higher than about 25 degrees above the southern horizon where skyglow is always a challenge. On this particular evening the transparency was really bad and I gave this a try just for yucks. I was very surprised that it turned out as well as it did.

NGC 253 is currently low in the southwest at sunset.