This dataset captures the Clamshell Nebula, catalogued as Sh2-119, through 22.25 hours of narrowband integration collected between August 15 and September 5, 2025. The acquisition used a Sky-Watcher Esprit 120mm refractor paired with a ZWO ASI2600MM Pro monochrome camera on an AM5 mount. The imaging sequence comprises 107 frames in hydrogen-alpha (5-minute exposures each), 86 frames in sulphur-II, and 74 frames in oxygen-III, all captured through Antlia 3nm narrowband filters.
The data is offered under a CC0 1.0 Universal license, placing it in the public domain with no copyright restrictions. Access is available through a one-time purchase of approximately $19.90, providing calibrated sub-exposures suitable for custom processing, scientific analysis, or educational projects focused on this emission nebula.
Generated from the dataset's metadata; the author's description above is authoritative.