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Contains:  M 31, Great Nebula in Andromeda, NGC 224, M 110, NGC 205, The star 45And, The star 44And, The star Mirach (βAnd), The star φAnd, The star 41And, The star 39And, The star μAnd, The star νAnd, The star πCas, The star 32And, Part of the constellation Andromeda (And)
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M31 Medium Field, 


M31 Medium Field

M31 Medium Field

Technical card

Resolution: 3448x2584

Dates:Sept. 10, 2018

Frames: 27x30"

Integration: 0.2 hours

Avg. Moon age: 0.86 days

Avg. Moon phase: 0.83% job: 2256032

RA center: 11.723 degrees

DEC center: 40.839 degrees

Pixel scale: 14.006 arcsec/pixel

Orientation: 267.843 degrees

Field radius: 8.382 degrees

Locations: ORM, La Palma, Spain

Data source: Backyard


My first (real) go at processing one-shot-color. All I have is an MFT EVIL camera (G5), but why not try it? 27 frames of 30s each using Llong exposure noise reduction. I took also flats and flat darks, but couldn't use them to correct the light frames. LENR seems to do more/something else....
Processed the RGB way: Split with dcraw, drizzle 3x, average, subtract background fit for black point, combine to RGB, some some contrast stretch, and sclae down 2.
The latter mostly because the lens has strong blue halos around bright stars. Guess I do need a UV filter for it....



License: None (All rights reserved)

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M31 Medium Field,