This dataset captures NGC 4258, also known as M106, through 40.75 hours of narrowband and broadband imaging acquired between late October 2025 and early February 2026. The collection was gathered using a Sky-Watcher Esprit 120mm refractor paired with a ZWO ASI2600MM Pro monochrome camera on an AM5 mount. The bulk of the exposure time comes from 315 luminance frames at 300 seconds each, supplemented by 95 hydrogen-alpha frames through an Antlia 3nm filter and smaller sets of red, green and blue data totaling 79 frames. All filters are 2-inch Antlia models. The data is offered under a Creative Commons BY-NC 4.0 license for roughly $24.90, permitting copying, modification and redistribution for non-commercial purposes. This extended integration time provides substantial signal for revealing the spiral structure and active galactic nucleus of this nearby galaxy.
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