All the material on this website is copyrighted to J-P Metsavainio, if not otherwise stated. Any content on this website may not be reproduced without the author’s permission.

Have a visit in my portfolio

Vieraile portfoliossani

Monday, August 22, 2016

Pickering's Triangle reprocessed

This shot about the Pickering's Triangle was my opening image for the Autumn season 2015.
It was also selected for a Astronomy Picture of the Day (APOD) by the NASA. 

I'm waiting to new imaging season to start. To practise my astronomical image processing skills, I have reprocessed the whole dataset, about 20 hours of exposures. 

Pickering's Triangle
Be sure to click for a large image!

The final photo has now better details and little bit more vivid colors. You can see the previous version in the original blog post HEREColors are from the ionized elements, Hydrogen, Sulfur and Oxygen. S-II = Red, H-alpha = Green and O-III = Blue. 

A closeup
Be sure to click for a large image!

An experimental starless version
Be sure to click for a large image!

Details in this complex supernova remnant are easier to see when the stars are suppressed.  It looks kind of spooky too.

The whole two frame mosaic in cinemascope format
Be sure to click for a large image!

A wide field photo shows the whole Veil Nebula supernova remnant

The Pickering's Triangle can be see at one o'clock position.
My blog post about the 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, 33 iterations, added at 33% 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 = 12h (Autumn 2014)
S-II,  from my older wide field photo of the Veil Nebula = 3h 
Total 20h

No comments: