M101
About this celestial object
The broad spiral arms of M101 reveal structure in this deep stack despite its low altitude.
M101 is an extended spiral galaxy with richly branched arms — long integrations reveal knots and asymmetries.
So low on the horizon, the finest filaments remain soft, yet arm segments and brightness variations become clearer.
About 100 minutes total integration at 250 mm f/5 bolster the low‑surface‑brightness outskirts.
Image and observation
Catalogue: M 101
Capture date: 2025-04-20
Imaging and processing: Ulrich Schwarz · Vespera Pro