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Simeis 57 / DWB-111 Propeller Nebula

Technical card

Imaging telescope or lens: Skywatcher Explorer 200PDS

Imaging camera: QHYCCD QHY9M

Mount: Skywatcher NEQ6 PRO Synscan

Guiding telescope or lens: Skywatcher 9x50 finderscope

Guiding camera: QHYCCD QHY5L-IIc

Focal reducer: Baader MPCC Mk III

Software: Pixinsight

Filters: Baader Red 2"Baader L 2''Baader Blue 2"Baader Green 2"

Accessories: QHYCCD QHY 2" Filter wheelSeletek Armadillo

Resolution: 3136x2376

Dates: Sept. 13, 2016

Baader Blue 2": 5x600" -20C bin 1x1
Baader Green 2": 5x600" -20C bin 1x1
Baader L 2'': 13x600" -20C bin 1x1
Baader Red 2": 5x600" -20C bin 1x1

Integration: 4.7 hours

Flats: ~15

Bias: ~100

Avg. Moon age: 11.22 days

Avg. Moon phase: 86.43% job: 1241355

RA center: 304.040 degrees

DEC center: 43.694 degrees

Pixel scale: 1.107 arcsec/pixel

Orientation: 10.100 degrees

Field radius: 0.605 degrees


I was going to shoot SH2-114 (the Dragon Nebula) but it wouldn't show up at all in 5 minute test shots. So I went for my next target in list, the Propeller Nebula in Cygnus. I always find it difficult to process these Cygnus nebulae, as there's not a single pixel of background sky visible. Even when I register some HA image as my reference for background extraction, I have this nagging doubt about messing with the data. At least the propeller shows up fine.




Sky plot

Sky plot


Simeis 57 / DWB-111 Propeller Nebula,