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Wednesday, May 22, 2013

Filaments of the Veil nebula, starless view

One of my starless astronomical image experiences, the Pickering's Triangle in Cygnus supernova remnant.
This area of the nebula is filled with colorful filaments, ionized sulfur and hydrogen are seen as green, golden hues, ionized oxygen can be seen as blue.

The Pickering's Triangle with a suppressed stars
A detail of the Veil Nebula supernova remnant

The complexity of filaments stands out nicely in this starless image.

An original image with the stars

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

Original blog post about this image, with the technical details, can be seen here:

Orientation in the Veil Nebula SNR

Area of interest is marked as a white rectangle, the apparent size of the Moon can be seen at lower right corner.


Pickering's Triangle, Simeis 3-188, is a small part of the Veil Nebula supernova remnant in constellation Cygnus.
Veil Nebula is a cloud of ionized gas and dust, leftovers from an exploded star. The star went off some 5000-8000 years ago at distance of about 1470 light years. This, relatively faint target, is difficult to image due to the large angular diameter, about three degrees, and a dense star field.

Exposure and processing details

Processing work flow:
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Levels, curves and color combine in PS CS3.

Optics, Meade LX200 GPS 12" @ f5
Camera, QHY9
Guiding, SXV-AO, an active optics unit, and Lodestar guide camera 8Hz
Image Scale, ~0,8 arc-seconds/pixel
15 x 1200s exposures for the H-alpha, emission of ionized Hydrogen = 5h
9 x 1200s exposures for the O-III, emission of ionized Oxygen = 3h
4x1200s exposures for the S-II, emission of ionized Sulfur = 1h 20min.

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