Celestial hemisphere:  Northern  ·  Constellation: Cepheus (Cep)  ·  Contains:  Iris Nebula  ·  NGC 7023
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NGC 7023, Iris Nebula, Cep, Vladimir Machek
NGC 7023, Iris Nebula, Cep
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NGC 7023, Iris Nebula, Cep

Getting plate-solving status, please wait...
NGC 7023, Iris Nebula, Cep, Vladimir Machek
NGC 7023, Iris Nebula, Cep
Powered byPixInsight

NGC 7023, Iris Nebula, Cep

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Description

DESCRIPTION: Beautiful blue reflection nebula with dark dast around in constellation Cepheus. The nebula which shines at magnitude +6.8, is illuminated by a magnitude +7.4 star SAO 19158. Apparent dimension 18’ x 18’ is on the limit of possibility for my Nikkor 500 mm / f 5,6 PF lens. Exposure is little bit tricky. The core is relatively bright and must be correctly exposed (unfortunately not my case). All constructive comments are welcome. You can be critical. I would very much appreciate your advice and tips. 

OBJECT: NGC 7023, Iris Nebula, Constelation Cepheus, apparent magnitude 6,8, apparent dimension 18 x 18 arcmin, FOV 3,5 x 2,5 arcdeg. 

GEAR: Nikon Z7 Kolari Full Spectrum + Nikkor 500/5,6 PF,  Astronomic UV/IR/L2 Cli in filter, Rollei Astroklar light pollution filter, Dew heater strip, sensor pixel scale 1,79 arcsec/px,  tracking mount iOptron CEM60EC - 3 star alignment, no auto guiding. 

ACQUISITION: All frame taken in two sessions, September 3-5, 2021, Struz, CZ, Subexposure 180s, f 5,6, ISO 2000, Interval 15 s, RAW-L, Light 34x, Dark 30x, Bias 20x, Flat 20x, DarkFlat 10x. Total exposure time 102 min. Night, no wind, 7-8°C, no Moon, Light polluted area - Bortle 5. 

STACKING AND POST PROCESSING: AstroPixelProcessor (stacking, background neutralization, light pollution removal, calibrate background) , Adobe Photoshop CC 2021 (stretching, black and white point settings, dim stars, enhance DSO, contrast setting, noise reduction). Cropped 1,3 x, image size 3840 x 2560 px.

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