Jeff
15-11-2018, 08:54 PM
After a few weeks in Melbourne without clear evening skies, I have gotten a bit of "cabin fever" and attempted to download and process some Hubble data for the first time.
Data for this image was acquired through the Hubble telescope in December 2010 using the Ultraviolet-Visible channel of WFC3 (Wide Field Camera 3).
http://www.stsci.edu/hst/wfc3/documents/handbooks/currentDHB/wfc3_dhb.pdf
The WFC3/UVIS instrument on the Hubble is quite peculiar, in that it comprises two imaging chips, separated by a distance of 30 pixels. As a result, the calibrated and distortion corrected stacks include a 30 pixel "dead-zone" through the middle of them with data missing. To compensate for this, the Hubble acquires a 2nd (slightly offset) image on the next day with the "dead zone" between chips in a slightly different position (see first 2 image revisions).
15 hours of data through the F600LP filter (599->996nm) was mapped to the Red channel.
18 hours via the F475X filter (378->650nm) was mapped to the Green and Blue channels.
UV data was quite weak and extremely noisy, so has been discarded.
To assemble complete images for each filter, a "mosaic scrapbook" approach was adopted using DynamicCrop, NewImage, PixelMath plus a few other processes to match gradients.
The result is nowhere near as good as APODs of this object …. as I continue to build my fledging skills in PixInsight. But I have enjoyed the process nonetheless!
Higher resolution version here (https://www.astrobin.com/376742/C/?nc=user).
Data for this image was acquired through the Hubble telescope in December 2010 using the Ultraviolet-Visible channel of WFC3 (Wide Field Camera 3).
http://www.stsci.edu/hst/wfc3/documents/handbooks/currentDHB/wfc3_dhb.pdf
The WFC3/UVIS instrument on the Hubble is quite peculiar, in that it comprises two imaging chips, separated by a distance of 30 pixels. As a result, the calibrated and distortion corrected stacks include a 30 pixel "dead-zone" through the middle of them with data missing. To compensate for this, the Hubble acquires a 2nd (slightly offset) image on the next day with the "dead zone" between chips in a slightly different position (see first 2 image revisions).
15 hours of data through the F600LP filter (599->996nm) was mapped to the Red channel.
18 hours via the F475X filter (378->650nm) was mapped to the Green and Blue channels.
UV data was quite weak and extremely noisy, so has been discarded.
To assemble complete images for each filter, a "mosaic scrapbook" approach was adopted using DynamicCrop, NewImage, PixelMath plus a few other processes to match gradients.
The result is nowhere near as good as APODs of this object …. as I continue to build my fledging skills in PixInsight. But I have enjoyed the process nonetheless!
Higher resolution version here (https://www.astrobin.com/376742/C/?nc=user).