Monday, August 19, 2013

NGC 6755

NGC 6755 by S Migol
NGC 6755, a photo by S Migol on Flickr.
Via Flickr:
NGC 6755, NGC 6756, and Sharpless2-74 appearing with the star field that makes up the Milky Way.
Taken in the backyard over 3 nights from July to August. Transparency suffered over several nights so the clarity of the dark lanes is not as good as I'd like. Also, since this was shot in a suburban location, the contrast is also weak. The overall color should be correct since this area has a lot of dust and thus many stars are redder.

Taken with the Stellarvue SV4 scope using the modified and cooled Pentax K10D camera with the IDAS LPS filter.

17 subs at 1200 seconds each stacked
Guided and calibrated with Maxim using 15 darks, 65 flats, and 260 bias.
Stacked with DSS.
Processed with PixInsight including: Dynamic Crop to remove ragged mosaic edges, Computing PSF then Deconvolution, DBE, SCNR, unmasked Histogram and Curves, followed by masked Atrous Wavelets processing.

Plate solve results:
=======================================================
Referentiation Matrix (Gnomonic projection = Matrix * Coords[x,y]):
-2.3782e-005 +0.000529567 -0.632694
-0.000529614 -2.38049e-005 +1.02985
+0 +0 +1
Projection origin.. [1887.025378 1279.482267]pix -> [RA:+19 08 25.10 Dec:+04 57 14.25]
Resolution ........ 1.908 arcsec/pix
Rotation .......... -87.425 deg
Focal ............. 656.04 mm
Pixel size ........ 6.07 um
Field of view ..... 2d 0' 2.5" x 1d 21' 23.7"
Image center ...... RA: 19 08 25.103 Dec: +04 57 14.29
Image bounds:
top-left ....... RA: 19 05 52.453 Dec: +05 59 00.00
top-right ...... RA: 19 05 31.327 Dec: +03 59 05.36
bottom-left .... RA: 19 11 19.389 Dec: +05 55 20.38
bottom-right ... RA: 19 10 57.278 Dec: +03 55 26.40
========================================================