Medusa Neb­ula (PK 205+14.1) in Gemini

The Medusa Neb­ula is a large plan­et­ary neb­ula in the con­stel­la­tion of Gem­ini on the Canis Minor bor­der. It also known as Abell 21 and Sharp­less 274. It was ori­gin­ally dis­covered in 1955 by UCLA astro­nomer George O. Abell, who clas­si­fied it as an old plan­et­ary neb­ula. The braided ser­pent­ine fil­a­ments of glow­ing gas sug­gests the ser­pent hair of Medusa found in ancient Greek mythology.

Until the early 1970s, the Medusa 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.

This image is a com­bin­a­tion of long exposed nar­row­band-data (Ha/​OIII) with a clas­sic­al LRGB. North is about upper right of the image. The galaxy group left of the neb­ula is ran­ging between mag 18.2 (PGC 1422135) and mag 18.8 (PGC 1421175).

[descrip­tion from wikipedia]


RCOS 14.5″ f/​8
Apo­gee U16M
Astro­don Gen2
HaOIIILRGB 960:480:400:220:220:220 min.
ROSA Remote Obser­vat­or­ies South­ern Alps
© Mar­tin Ruster­holz, Astrophotographer

Find­er Chart Medusa Neb­ula (PK 205+14.1) in Gemini

Medusa Nebula Sky Chart - Astrophotography Martin Rusterholz

Image cre­ated by Skychart

About Me

Hello, my name is Martin Rusterholz. I’m a Swiss amateur astrophotographer living near Zurich, the biggest town in Switzerland. My interest in astronomy started when I was 16. At that time, I built my first Newtonian telescope and mount. I studied physics at the Swiss Federal Institute of Technology (ETH) which was the only study including at least some aspects of astronomy and astrophysics. “Looking at the nights sky is an experience touching everybody deeply inside, something common to all human beings independent to the language spoken by the individuals”. Deep-sky astrophotography is my passion.