10/10/2023
SH 2-221
The Medusa Nebula is a planetary nebula in the constellation of Gemini. It is also known as Abell 21 and Sharpless 2-274. It was originally discovered in 1955 by University of California, Los Angeles astronomer George O. Abell, who classified it as an old planetary nebula. Until the early 1970s, the nebula was thought to be a supernova remnant. With the computation of expansion velocities and the thermal character of the radio emission, Soviet astronomers in 1971 concluded that it was most likely a planetary nebula. As the nebula is so large, its surface brightness is very low, with surface magnitudes of between +15.99 and +25 reported. WIKIPEDIA
IMAGING DATA
Provo, Utah
Bortle 5 sky
Date: 10/7&8/2023
Image: SH 2-221
Camera: ZWO ASI2600 MC Pro in Hyperstar Position
Filter: STC Astro Duo-Narrowband
Temperature: -5 deg C
Gain: 100
Binning: 1×1
Exposure: 180 seconds
# of Lights: 65 for 3 hours 15 minutes were used.
Telescope: Celestron 1100 Edge HD
Hyperstar IV Camera mount
Mount: 10Micron GM1000HPS
Pier: Steel pier on 600 lb concrete block
Observatory: NexDome “Y Mountain Observatory”
Software used
Deep Sky Stacker, Pixinsight, Photoshop
