In 1959 U.S. astronomer Stewart Sharpless published a catalog of 312 Hydrogen-ii emission nebulae. This is number 261, a faint nebula in the constellation Orion. Also known as Lower's Nebula, it is named after father and son Harold and Charles Lower who discovered it photographically in 1939.
| Exposure |
• 12 hours (72 X 10 minutes) @ -20°C ☞ 24 full color ☞ 48 with Hα filter • Dusk flats • Camera position angle: 0° |
| Processing |
• With PixInsight: ☞ Calibrate, star-align, integrate subframes ☞ Histogram transformation • Noise reduction with Topaz DeNoise AI • Ffinal tweaking and sizing in Photoshop CS6 |
| Date and Location |
• November 20 & 28, 2022 • Louisa County, Virginia, USA |
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Equipment |
• TMB-130SS APO refractor @ f/7 on an A-P 1200 mount • ZWO ASI-1600MC Pro color camera • Guided with a ZWO ASI-120M camera on a 60mm f/5 scope • Imaging and autoguiding with MaxIm DL 6.20 • Automated image acquisition with ACP Observatory Control |
Updated May 23, 2023