Observation by Richard Francis: Rosette Nebula LSHO
Uploaded by
Richard Francis
Observer
Richard Francis
Observed
2023 Dec 17 - 00:00
Uploaded
2024 May 29 - 18:35
Objects
The Rosette Nebula (Caldwell 49)
Planetarium overlay
Constellation
Monoceros
Field centre
RA: 06h32m
Dec: +04°59'
Position angle: -1°00'
Field size
0°59' × 0°50'
Equipment
- Officina Stellare U-CRC360
- Paramount MEII
- Moravian C5A-100M
Exposure
28x300s + 3x150s each of SII, Ha and OIII
Location
La Romieu, SW France
Target name
Rosette Nebula
Title
Rosette Nebula LSHO
About this image
This image is very similar to an image in this gallery made in January 2019 which was the first light image with our then-new Kepler 4040 camera. Almost 5 years later it has been replaced with a Moravian C5A-100M camera, and since the season was about the same, I chose this object as the first light again. This image is almost the First Light image: a previous image of the same object in LRGB is actually the real First Light but these data were taken in the following days and so are quasi-first-light.
There's a fair amount of data in this image, though the exposures are 300 s (and some are only 150 s). I have learned that generally I need to increase the exposures for this camera (though I haven't yet got any examples of this) so overall I'm rather pleased with the performance here.
For this image I've experimented with a new workflow, using Russel Croman's StarXTerminator process in PixInsight to allow me to process stars and nebula separately. I haven't got it working optimally yet, and need to improve my technique: brighter stars are leaving artefacts. But despite this, it is an interesting way to process, and I'm generally optimistic. With less bright stars it would work even better.
I am having an unexpected issue with this camera though: the images are 105 Megapixels, so staying within the 3 Mb upload limit here is a struggle. For this image (where the original JPEG is 11 Nb with quality 10) I have done some serious cropping and reduced the JPEG quality to 4 to fit the limit. It's a pity.
Files associated with this observation
Like this image
Copyright of all images and other observations submitted to the BAA remains with the owner of the work.
Reproduction of work by third parties is expressly forbidden without the consent of the copyright
holder. By submitting images to this online gallery, you grant the BAA permission to reproduce them in
any
of our publications.