Saturday, February 23, 2013

Leo Triplet

Leo Triplet by S Migol
Leo Triplet, a photo by S Migol on Flickr.
Via Flickr:
Leo Triplet with 31 frames of 1200 seconds at 100 ISO for 10 hours and 22 minutes of integration.

I wanted to give a lighter touch to the processing on this shot given the work I'd done on the Sh 290 object. There's still a mottled background and so it's not as pretty as if I'd driven it darker like I do on some other targets.

Taken from home where the light polluted skies give an orange color to the background.

Standard setup. Camera was using the new cooler arrangement, so the EXIF temps were reading about 4 C and the thermal probe was mostly at 0C.

Here's the plate solve results:
Referentiation Matrix (Gnomonic projection = Matrix * Coords[x,y]):
-0.000001111043 -0.000530669418 +0.671544214950
+0.000530622860 -0.000001324026 -1.003330659875
+0.000000000000 +0.000000000000 +1.000000000000
Resolution ........ 1.910 arcsec/pix
Rotation .......... 89.866 deg
Focal ............. 655.40 mm
Pixel size ........ 6.07 um
Field of view ..... 2d 0' 36.3" x 1d 20' 19.8"
Image center ...... RA: 11 20 04.352 Dec: +13 24 25.54
Image bounds:
top-left ....... RA: 11 22 49.341 Dec: +12 24 10.81
top-right ...... RA: 11 22 49.684 Dec: +14 24 45.59
bottom-left .... RA: 11 17 20.399 Dec: +12 23 58.83
bottom-right ... RA: 11 17 17.980 Dec: +14 24 33.52

Leo Triplet Annotated

Leo Triplet -Cropped