Sunday, August 25, 2013

Iris Nebula

Iris Nebula by S Migol
Iris Nebula, a photo by S Migol on Flickr.
Via Flickr:
Iris Nebula as seen in the backyard from sessions covering Aug 9 to 13, 2013. Total of 36 subexposures of 1200 seconds each for 12 hours of integration.

Taken with the modified and cooled Pentax K10D camera on the Stellarvue SV4 scope. Used flattener, IDAS LPS and Baader UV/IR block filter.

Guided and calibrated using Maxim
Calibrated with 17 darks, 260 bias, and 64 flats
Stacked using DSS
Processes in PixInsight.

Had problems with deconvolution, so I skipped that step and used MT and other tools to tighten the stars.

Major steps used: DBE, Masked stretch, Histogram stretch, SCNR, MT, TGV Denoise (very powerful tool), unsharp mask, used histogram to fix white balance, and curves to tweak the dark areas.

Here is the plate solve:
=========================================
Referentiation Matrix (Gnomonic projection = Matrix * Coords[x,y]):
-2.95879e-005 +0.0005293 -0.631033
-0.0005292 -2.95661e-005 +1.03511
+0 +0 +1
Projection origin.. [1883.493642 1297.489779]pix -> [RA:+21 02 23.45 Dec:+68 07 48.09]
Resolution ........ 1.908 arcsec/pix
Rotation .......... -86.807 deg
Focal ............. 656.10 mm
Pixel size ........ 6.07 um
Field of view ..... 1d 59' 48.5" x 1d 22' 32.0"
Image center ...... RA: 21 02 23.456 Dec: +68 07 48.07
Image bounds:
top-left ....... RA: 20 55 17.857 Dec: +69 09 21.21
top-right ...... RA: 20 54 44.380 Dec: +67 09 37.09
bottom-left .... RA: 21 10 42.424 Dec: +69 04 32.64
bottom-right ... RA: 21 08 52.414 Dec: +67 05 12.49
=========================================