Wednesday, January 29, 2020

imaged Orion (Bradford)

Quick processing of an image for each of the two sets of Orion.

All with Canon 40D, kit 18-55 lens at f/5.6, 30 second exposure, ISO 800, in-camera noise subtraction, shot RAW, daylight white balance, manually focused, controlled by Backyard EOS. Atop custom barn door tracker with alt-az base and Mamiya tripod. Lens heated. Filter removed.

Orion with Sirius

9:38 PM. Aimed south-south-east so to include Sirius. Camera upright. Light pollution from Newmarket. Not polar aligned in any way.

You can see the Great Orion Nebula, 42 and 45 Orionis, ι (iota) Ori, Meissa, Collinder 69, et al. The open cluster NGC 1981 north of 42-45 is obvious when you zoom in. There's just a hint of Messier 41 below Sirius. Lepus is in the trees.

constellation Orion with Pleiades

9:57 PM. Aimed south-south-west so to embrace Pleiades. Camera inverted. Polaris in the finder scope.

Taurus is lovely. A few of the double stars are visible within, like θ (theta) 1 and 2, σ (sigma) 1 and 2. Orange Menkar is peeking through the branches on the right.

In these photos, Betelgeuse looks the same magnitude as Bellatrix, maybe even a touch brighter.

I didn't realise it at the time but the lens was at 24mm. I wanted 18. That's why I couldn't seem to fit everything...

Both images slightly enhanced in Digital Photo Professional 4.6: brightened, boosted contrast, dropped the shadows, boosted saturation, rotated as needed, scaled.

Good transparency, good seeing, humidity low at 42%, air temperature around -11°C.


Got a good result, finally, from stacking.


Identified objects in the photo.

No comments: