Friday, October 30, 2015

Melotte 15: A star cluster in the Heart Nebula

Image: The open star cluster Melotte 15 is found in the center of IC1805

Exposure: SII (red), Ha (green), OIII (blue), 3x10min. exposures for each channel at 660mm (f/5.2), extra RGB exposures to retrieve the star colors.
Image composition: SII-Hα-OIII for the nebulosity, RGB for the stars, HST composite.
Links: Wikipedia

Wednesday, October 21, 2015

The Pinwheel Galaxy M101

Image: M101

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