Caldwel 49: Rosette Nebula in Narrow Band (Fernando)

Caldwel 49: Rosette Nebula in Narrow Band

Rosette is an emission nebula with a open cluster embedded, distant from Solar System about 5.000 Light Years. Its apparent size is 78 arc-minutes,corresponding to almost two full Moons, Magnitude 4.8 and age of about 2 million years.

For my interest, the most interesting feature of this nebula is the presence of patches of obscured matter as well as the presence of dark nebulae spread out as dark lanes over the nebular structure. The smaller of this dark structures is know as Bok Globules with size comparable, in average, to 5 solar systems, works as cocoons for active star formation.

A word about Bok Globules: They are dense opaque clouds of dust and gas, some of which are condensing under gravitational attraction to form stars and planets.

To have a better contrast of these structures, I decided to image Rosette in Narrow Band , using Ha and O3 filters.

Image:

9x900sec Ha bin 1x1

12x900sec O3 bin 1x1

Scope: TMB 92 f/5.5

Focal Reducer Flattener Teleview TRF 2008: x0.8

OAG: SBIG OAG-8300

Camera: ST8300

CCD Guider: Lodestar'

Pre and Pos-Processing: PixInsight

Bias, Darks and Flats applied

** REPROCESSING**

This re-processing aimed to stand out the O3 data, by increasing the contrast in the blue channel. Also some better sharpening has been carried out in the synthetic luminance channel.

Final
Original
B

Please note: The following tables are updated every 24 hours.

Distribution of astrophotographers

This table shows the number of distinct astrophotographers who have been assigned and IOTD/TP award compared to the total number of images awarded.
	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

Distribution of subject types

This table shows the distribution of awards per subject type, compared to the popularity of images of that subject type.
	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape

Distribution of data sources

This table shows the distribution of awards per data source, compared to the popularity of images acquired from that data source.
	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
Own remote observatory
Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
Other
Unknown

The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	n/a
Started	n/a
Astrometry.net job	n/a
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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