• Source: Medusa Nebula

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. 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.
The central star of the planetary nebula is an PG 1159 star.




See also


Abell Catalog of Planetary Nebulae　　　　　　　　　　　
Geminga, Gemini gamma-ray source
Gemini in Chinese astronomy
IC 444, reflection nebula
Messier 35 open cluster
Cancer Minor (constellation) - Obsolete constellation inside modern Gemini




References






External links


The Sharpless Catalog: Sharpless 274
APOD picture: The Medusa Nebula
Images of the Universe: PK 205+14.1 The Medusa Nebula in Gemini

Kata Kunci Pencarian:

• Penghargaan Nebula untuk Novella Terbaik
• Uranium
• Elizabeth Hand
• Penghargaan Hugo untuk Novella Terbaik
• Medusa Nebula
• Medusa (disambiguation)
• Gemini (constellation)
• List of planetary nebulae
• A Meeting with Medusa
• Arthur C. Clarke bibliography
• Perseus
• Abell Catalog of Planetary Nebulae
• Perseus (constellation)
• Nebula Award for Best Novella