Medusa nebula, 24 inch telescope on Mt. Lemmon, AZ.
|Right ascension||07h 29m 02.69s|
|Declination||+13° 14′ 48.4″|
|Distance||1,500 ly (460 pc)|
|Apparent magnitude (V)||15.99|
|Apparent dimensions (V)||4 ly|
|Absolute magnitude (V)||7.68|
|Notable features||Very large & very low surface brightness|
|Other designations||Sharpless 2-274, PK 205+14 1, Abel 21 |
The Medusa Nebula is a large
- The Sharpless Catalog: Sharpless 274
- APOD picture: The Medusa Nebula
- Images of the Universe: PK 205+14.1 The Medusa Nebula in Gemini
- "MEDUSA -- Planetary Nebula". Centre de Données astronomiques de Strasbourg. Retrieved 2010-07-01.
- Cutri, R. M.; Skrutskie, M. F.; Van Dyk, S.; Beichman, C. A.; et al. (June 2003). "2MASS All Sky Catalog of point sources". The IRSA 2MASS All-Sky Point Source Catalog, NASA/IPAC Infrared Science Archive.
- Robert Nemiroff (MTU) & Jerry Bonnell (USRA) (12 June 2010). "The Medusa Nebula". Today's
- Lozinskaya, T. A. (June 1973). "Interferometry of the Medusa Nebula A21 (YM 29)". Soviet Astronomy. ADS 16: 945.
As the nebula is so big, its surface brightness is very low, with surface magnitudes of between +15.99 and +25 reported. Because of this most websites recommend at least an 8-inch (200 mm) telescope with an [O III] filter to find this object although probably possible to image with smaller apertures.
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.