Dieser umrahmt oben ein 15° x 10°-Feld um Sirius, um den hellen Sternhaufen Messier 41 darunter einzuschließen. Aber auch im Rahmen gibt es mehrere andere
This frames a 15º by 10° field around Sirius, at top, to include the bright star cluster Messier 41 below it. But also in the frame are several other smaller clusters and faint nebulas in northern Canis Major. At upper left is the star cluster NGC 2360. Just left of M41 is the pair of small clusters Tombaugh 1 and 2 (the latter larger and on the right) discovered and catalogued by Clyde Tombaugh, the discoverer of Pluto. The red nebula at left above the Tombaugh clusters is Gum 5, aka Sharpless 2-301. At the very bottom just in frame is the faint green arc of the large planetary nebula Sh2-308, popularly known as the Dolphin Head Nebula. At lower left is the large faint nebulosity Sharpless 2-310. The star at far right is Murzm, or Beta Canis Majoris. This is a stack of 12 x 2 minute exposures with the Canon RF135mm lens at f/2 on the Canon Ra at ISO 800, tracking but not guided on the Astro-Physics AP400 mount. The lens had an URTH Night broadband filter on it. Taken from near Coonabarabran, Australia in March 2024 on a night devoted to shooting 135mm fields along the Milky Way.
