Friday, February 1, 2013

IC 443 Jellyfish Nebula

IC 443 Jellyfish Nebula by S Migol
IC 443 Jellyfish Nebula, a photo by S Migol on Flickr.
Via Flickr:
IC 443 Jellyfish Nebula as seen from Jan 12 to Jan 18, 2013 in the back yard.

This is a total of 162 subs at 10 minutes each giving 27 hours of integration on the subject. The weather was clear and very cold - each night dipped below freezing which is rare for the area. Camera temperatures were nearly all at 3-4C with the cooler running.



While I wanted to gather lots of decent data, I may have included too many frames that had high background noise from skyglow. After calibration, some of the frames from late in the morning (and thus low in the sky) had background glow near 1.5% of a 16% range. I may restack someday with a more critical parameter.

These flawed frames are probably where the brown bar along the bottom of the frame and the right side originate.

As usual, this was with the Stellarvue SV4 with flattener and the IDAS LPR.

Tracking and calibration was done with Maxim. Registration and stacking in DSS. Processing in PixInsight.

Here's the plate solve:
Referentiation Matrix (Gnomonic projection = Matrix * Coords[x,y]):
+0.000016387355 -0.000530641189 +0.663935662455
+0.000530606825 +0.000016581651 -1.050087048666
+0.000000000000 +0.000000000000 +1.000000000000
Resolution ........ 1.911 arcsec/pix
Rotation .......... 91.777 deg
Focal ............. 655.11 mm
Pixel size ........ 6.07 um
Field of view ..... 2d 3' 27.7" x 1d 23' 31.1"
Image center ...... RA: 06 17 51.851 Dec: +22 51 10.32
Image bounds:
top-left ....... RA: 06 20 43.428 Dec: +21 48 05.00
top-right ...... RA: 06 21 02.706 Dec: +23 51 26.27
bottom-left .... RA: 06 14 43.801 Dec: +21 50 40.35
bottom-right ... RA: 06 14 57.603 Dec: +23 54 03.95

This image also won the January 2013 Cloudy Nights Intermediate Challenge.There were no other entries, so it won by default.