Abell 21 Medusa Nebula


Mark Griffith

Swindon, Wiltshire. UK

Celestron C11 Sct, Skywatcher NEQ6 pro mount,Atik 383L+ camera, motorised filter wheel and Astronomik filters.

Ancient planetary nebula in the constellation of Gemini.

Not listed on the NGC or IC catalogues. Surprising given it’s 12 minute size. Framed nicely in my 30 minute field of view.

Typed in the RA and Dec as a user object into my Synscan handset to find it.

Dim nebula but worked out well using my narrowband filters and 2×2 binning.

HA/OIII/OIII image with 4 hours and 55 minutes of data. 29 x 5min Ha & 30 x 5min Oiii.