NGC 2237, commonly known as the Rosette Nebula, appears in this nine-hour narrowband dataset captured with an Askar 65PHQ Quintuple APO refractor and ZWO ASI294Mc Pro camera on an HEQ5 pro mount. The acquisition comprises 108 total frames: 60 exposures of 300 seconds each through a Svbony sv220 SII OIII filter, and 48 frames of equal duration through a Svbony sv220 Ha OIII filter. This combination of narrowband filters isolates emission from ionized sulfur, hydrogen, and oxygen, revealing the nebula's intricate structure and star-forming regions. The data was gathered between late November and late December 2025. Released under a CC BY 4.0 license, the dataset is available as a free download, permitting users to copy, modify, and redistribute the material for any purpose provided appropriate credit is given to the original author.
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