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

 

 

Imaging telescope or lens: TMB APO 92mm f/5.5

 

 

Imaging camera: SBIG ST8300M

 

 

Mount: Sky-Watcher NEQ-6 Goto

 

 

Guiding camera: Starlight-XPress Loadstar guider

 

 

Focal reducer: TeleVue TRF-2008 Reducer/Flattener

 

 

Software: PixInsight

 

 

Filter: Baader Planetarium Ha - OIII - SII

 

 

Accessories: Teleskop-Service TSOAG 9mm, Starlight Xpress SX USB Filter Wheel 7x36mm

 

 

Resolution: 2901x2229

 

 

Dates: Nov. 14, 2013

 

 

Frames: 22x900"

 

 

Integration: 5.5 hours

 

 

Avg. Moon age: 11.25 days

 

 

Avg. Moon phase: 86.62%

 

 

RA center: 98.030 degrees

 

 

DEC center: 5.074 degrees

 

 

Orientation: 96.062 degrees

 

 

Field radius: 1.560 degrees

 

 

Locations: Lily's Flower Observatory, Santa Rita do Sapucai, Minas Gerais, Braz

Done