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Thursday, October 1, 2015

A new image, the Witch's Broom Nebula

This is my second photo for this season from my observatory. It's a detail of the veil nebula supernova remnant, as was my first light photo for this Autumn season, the Pickering's Triangle. This is a two frames mosaic image, exposed on several nights between September 10. - 27. 2015. Total exposure time is about 11h.

NGC 6960, the Witch's Broom Nebula
Click for a large image, 2200 x 1500 pixels and 2,3MB

A two frame mosaic of the Veil Nebula supernova remnant, the Witch's Broom Nebula in mapped colors. Colors are from the emission of the ionized elements, Hydrogen, Sulfur and Oxygen. 
S-II = Red, H-alpha = Green and O-III = Blue. 

Close up images
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A starless image
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An experimental starless version to show the structure of the filaments better. 

Visual colors
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Natural color composition from the emission of ionized elements. 
This composition is very close to a visual spectrum. 

Witch's broom in light of an ionized oxygen only
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This image shows the Witch's Broom in Light of an ionized oxygen, O-III, alone.

A wide field photo of the Veil Nebula supernova remnant

The Witch's Broom Nebula can be see at three o'clock position.
My blog post about this older wide field shot can be seen HERE.

Technical details

Processing work flow

Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Deconvolution with a CCDStack2 Positive Constraint, 21 iterations, added at 25% weight
Color combine in PS CS3
Levels and curves in PS CS3.

Imaging optics
Celestron Edge HD 1100 @ f7 with 0,7 focal reducer for Edge HD 1100 telescope

10-micron 1000

Cameras and filters
Imaging camera Apogee Alta U16 and Apogee seven slot filter wheel
Guider camera, Lodestar x2 and SXV-AOL

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

Exposure times
H-alpha, 15 x 1200s = 5h
O-III, 36 x 1200s binned = 5h (Autumn 2014)
S-II,  from my older wide field photo of the Veil Nebula = 1h 
Total 11h

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