Medusa Nebula

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Medusa Nebula
Emission nebula
Planetary nebula
Abell21 Noaoann09008a.jpg
Medusa nebula, Mayall Telescope
Observation data: J2000.0 epoch
Right ascension 07h 29m 02.69s [1] [2]
Declination +13° 14′ 48.4″ [1] [2]
Distance1,500 ly (460 pc) [3]   ly
Apparent magnitude (V)15.99 [1]
Apparent dimensions (V)10.25 x 10.25 arcmin [1]
Constellation Gemini
Physical characteristics
Radius 4 [3]  ly
Absolute magnitude (V)7.68
Notable featuresVery large & very low surface brightness
Designations Sharpless 2-274, PK 205+14 1, Abell 21 [1]
See also: Lists of nebulae

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. [4] 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. [4] As the nebula is so large, its surface brightness is very low, with surface magnitudes of between +15.99 and +25 reported.[ citation needed ]

Contents

The central star of the planetary nebula is a PG 1159 star. [5]

See also

References

  1. 1 2 3 4 5 "MEDUSA – Planetary Nebula". Centre de Données astronomiques de Strasbourg . Retrieved 1 July 2010.
  2. 1 2 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. Bibcode:2003tmc..book.....C.
  3. 1 2 Nemiroff, R.; Bonnell, J., eds. (12 June 2010). "The Medusa Nebula". Astronomy Picture of the Day . NASA . Retrieved 1 July 2010.
  4. 1 2 Lozinskaya, T. A. (June 1973). "Interferometry of the Medusa Nebula A21 (YM 29)". Soviet Astronomy. 16: 945. Bibcode:1973SvA....16..945L.
  5. ↑ González-Santamaría, I.; Manteiga, M.; Manchado, A.; Ulla, A.; Dafonte, C.; López Varela, P. (2021). "Planetary nebulae in Gaia EDR3: Central star identification, properties, and binarity". Astronomy & Astrophysics. 656: A51. arXiv: 2109.12114 . Bibcode:2021A&A...656A..51G. doi:10.1051/0004-6361/202141916. S2CID   237940344.
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