Observation by Mike Greenhill-Hooper: Rosette nebula in SHO

Uploaded by

Mike Greenhill-Hooper

Observer

Mike Greenhill-Hooper

Observed

2022 Feb 08 - 21:00

Uploaded

2022 Feb 12 - 13:37

Objects

NGC2244

Equipment

770 f/7 ED TS Photoline refractor, 0.8 field flatenner on NEQ6 mount
Image camera: ASI294MM Pro; guide camera ASI224MC on 328mm piggy-backed refractor
Imaging, goto and dithering managed via APT / EQMOD; guiding via PHD2

Exposure

15x180s exposures for each of three filters: ZWO H-alpha, SII, Astronomik OIII. Camera gain 121, offset 10

Location

Miradoux, S.W. France

Target name

NGC2244

Title

Rosette nebula in SHO

About this image

First attempt at 3-colour narrowband imaging with the mono CMOS camera. Moon was ~50% illuminated and caused significant light gradients, nearly swamping the OII and SII images. In addition 45 minutes imaging for each filter is not sufficient. Applied Hubble palette convention - assigning H-alpha, OIII and SII images to green, blue and red, respectively. Calibrated images with darks (at -15C, same as imaging temperature), and flat and dark flats taken for each filter (indoors in dark room with light panel and T-shirts added to further reduce intensity to ensure ADU was at mid-point of 32k). All calibrations, stacking, colour image combining and post processing performed using Affinity Photo - a one-stop tool that I find so versatile.

Files associated with this observation

Rosette AF5 SHO MGH.jpg (1.0 MB)

Like this image

Manolo_Rodriguez, David Basey, Mr John William Hughes, Simon Paul Davis, Dominic Ford, Alun Halsey, Gerard Cauchi, Mr Ian David Sharp

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