Imaged the globular cluster M10 on the night of August 19, 2023. M10 has an apparent magnitude (v) of 6.6 and an apparent size of ~20 arcmin.
Per NASA (reference:
https://www.nasa.gov/feature/goddard/2017/messier-10): "Discovered by Charles Messier in 1764, M10 is a globular cluster located in the constellation Ophiuchus. It is roughly 15,000 light-years from Earth and has an apparent magnitude of 6.4. This cluster can be spotted using a pair of binoculars and is most easily observed during July. M10 is notable for its high population of blue stragglers — stars that appear to be far younger than their neighbors. The stars in globular clusters are thought to have formed and aged together, so they should all be roughly the same age. These anomalous, bluer stars were created either by collisions between stars or other stellar interactions. Such events are easy to imagine in densely populated globular clusters, in which up to a few million stars are tightly packed together."
Imaged with a William Optics GT81 at F4.7 (382 mm focal length) using Flat6A II field flattener/0.8x reducer, UVIRcut filter, and ZWO ASI 533MC Pro. Total integration time of ~1 hours: 38 subs at Gain = 100 with an exposure time of 90 sec.
Pre-processed using Pixinsight's weighted batch pre-processing script (WBPP) to perform calibration, debayering, registration, local normalization, and integration. Background removed using GradXpert. Initial post-processing in Pixinsight: spectrophotometric color calibration, blur x terminator, and noise x terminator. Masked stretch, curves adjustment, HDR transformation using EasyHDR script, local histogram transformation, and color saturation adjustment.
Original version: M10 OSC RGB image
Rev B: M10 OSC RGB image, inverted
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