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Tuesday, October 6, 2020

The Tulip nebula in cygnus, Sh2-101


This is my second light photo for the cloudy Autumn season 2020. The area next to well known Tulip Nebula is very beautiful and less imaged  due to its large size and relatively low surface brightness. My current toolset is very suitable for this kind of objects, since its kind of heavily undersampled and that's good when I need to capture very dim and large objects.

The tulip Nebula area 
Please, click for a large image, it's worth it!

Image is in mapped colours, from the emission of ionized elements, R=Sulphur, G=Hydrogen and B=Oxygen. 

A starless view
click for a large image

An experimental starless version shows the actual nebula complex better.


I have shot the actual Tulip Nebula with a large 11" telescope, images and info about the Tulip nebula can be seen HERE. An other interesting detail, a blue crescent like shape at center left. It's a Wolf Rayet shell around a star WR 134. I have shot this also with a large telescope, more info and images can be found HERE  

A closeup photo of the Wolf Rayet Shell around the star WR 134

This feature can be found from the new wide field photo at center left.

Nebula in light of an ionized hydrogen alone (H-alpha)
click for a large image

Nine twenty minute 5 nm H-alpha exposures are calibrated with bias corrected flats and stacked to this cumulative three hour exposure. 

Technical details

Processing workflow

Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Deconvolution with a CCDStack2 Positive Constraint, 33 iterations, added at 50% weight
Color combine in PS CS3
Levels and curves in PS CS3.

Imaging optics
Tokina AT-x f2.8 camera lens

10-micron 1000

Cameras and filters
Imaging camera Apogee Alta U16 and Apogee seven slot filter wheel
Guider camera, Lodestar x 2 and an old spotting scope of Meade LX200

Astrodon filters,
5nm H-alpha 3nm S-II and 3nm O-III

Total exposure time

H-alpha, 9 x 1200 s, binned 1x1 = 3 h
O-III, from my older photo of the area
S-II, from my older photo of the area
Older photo can be seen here,


Alex Xavier said...

Wooow.... Such a great work!!! Astonishing !!! Thank you for what you have created!! This is a treasure..!

Virgo said...

A Treasure, it certainly is!
A Work of Art really! It takes a Great Love for the Work to produce something at this Level of Quality.