NGC 1788, also known as the Cosmic Bat Nebula, is presented here as a 36.85-hour integration captured between December 2025 and February 2026. The dataset combines 240 frames through an Optolong L-Extreme HA-OIII 7nm narrowband filter with 497 frames using an Optolong L-Pro broadband filter, all at 180-second exposures. Imaging was performed with a ZWO ASI 533MC Pro colour camera paired with an Askar 71F refractor on an AM3 mount. This reflection nebula in Orion offers a distinctive bat-like morphology in the data, with the dual-filter approach capturing both nebular emission detail and broader spectral information. The complete raw dataset is available as a free download under a CC BY-NC 4.0 license, permitting copying, modification and redistribution for non-commercial purposes.
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