Friday, October 30, 2015
Image: The open star cluster Melotte 15 is found in the center of IC1805
Image composition: SII-Hα-OIII for the nebulosity, RGB for the stars, HST composite.
Wednesday, October 21, 2015
The Pinwheel Galaxy (M101 or NGC5457) is a face-on spiral galaxy in Ursa Major. On the right of the photo the faint (14m) galaxy NGC5477 is visible.
Exposure data: QHY8L, TOA130 at f/5.4, total of 7 exposures with 15min each, photos stacked via SigmaClip in MaximDL, Crop, Aperture 3 (Mac)
See also: http://messier.seds.org, http://en.wikipedia.org