OriginStack sample session: Whirlpool Galaxy (M51), face-on spiral galaxy - 45 raw Celestron Origin frames

45 raw Celestron Origin light frames of Whirlpool Galaxy (M51) (face-on spiral galaxy), 20 s each, captured 2026-07-01, with the session's own dark, flat and bias frames and the capture app's info.json. A face-on spiral galaxy with faint outer arms and a small companion. Colour sensor (Origin178), 6-inch f/2.2 RASA, 3056×2048 Bayer FITS. Filter setting in the headers: Clear. The frames are the best of the session by quality score, one from each of 45 consecutive time bins. The observer's location, GPS, airmass, session id and camera serial number were removed from the headers and json files; pixel data is unchanged. Capture time and the target's coordinates were kept. Stack it with OriginStack: python originstack.py -d "01_face-on_spiral_galaxy_M51_Whirlpool" -o stack.fits. With OriginStack 2.21: 45 of 45 frames accepted; median star width in the frames about 2.7 px. The file ending _expected_result.jpg is the preview that run produced. Zip: 597 MB, SHA-256 f6e46e6dc5c8543e5bbeadbd8fa1d7d33ef4914c1de59d5394b33faef0c3e9b8.