This dataset captures NGC 2361, commonly known as Thor's Helmet, through dual narrowband imaging using hydrogen-alpha and oxygen-III wavelengths. The acquisition spans from 17 October to 28 October 2025, accumulating 5.17 hours of total integration time across 62 frames of 300-second exposures. All data were collected through an Antlia ALP-T filter, which combines both narrowband channels in a single pass.
The imaging setup consists of a Sky-Watcher 200PDS telescope paired with a ZWO 585 MC pro camera, mounted on a Sky-Watcher EQ6 Pro equatorial mount. This emission nebula in Canis Major presents strong signal in both Ha and OIII bands, making it well-suited for dual narrowband processing techniques. The dataset is available as a free download under CC BY-NC 4.0 licensing, permitting copying, modification and redistribution for non-commercial purposes.
Generated from the dataset's metadata; the author's description above is authoritative.