Helix Nebula

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Helix Nebula
Comets Kick up Dust in Helix Nebula (PIA09178).jpg
Helix Nebula taken bi the Spitzer space telescope (Infrareid, 2007[1])
Credit: NASA, JPL, Caltech, Kate Su (Steward Obs., U. Arizona).
Observation data: J2000 epoch
Richt ascension22h 29m 38.55s[2]
Declination−20° 50′ 13.6″[2]
 ly (219+27
)[3] ly
Apparent magnitude (V)+7.6[2]
Apparent dimensions (V)25′[4]
Physical characteristics
Radius2.87 ly (0.88 pc)[4] ly
Notable featursAne o nearest PNs
DesignationsNGC 7293[2] Caldwell 63
See also: Leets o nebulae

The Helix Nebula, an aa kent as The Helix, NGC 7293, is a lairge planetary nebula (PN) locatit in the constellation Aquarius. Discovered bi Karl Ludwig Harding, probably afore 1824, this object is ane o the closest tae the Yird o aw the bright planetary nebulae.[5]

References[eedit | eedit soorce]

  1. Su, K. Y. L.; Chu, Y.-H.; Rieke, G. H.; Huggins, P. J.; et al. (March 2007). "A Debris Disk around the Central Star of the Helix Nebula?". The Astrophysical Journal. 657 (2): L41–L45. arXiv:astro-ph/0702296. Bibcode:2007ApJ...657L..41S. doi:10.1086/513018.
  2. 2.0 2.1 2.2 2.3 "SIMBAD Astronomical Database". Results for Helix Nebula. Retrieved 2006-12-07.
  3. Harris, Hugh C.; Dahn, Conard C.; Canzian, Blaise; Guetter, Harry H.; et al. (February 2007). "Trigonometric Parallaxes of Central Stars of Planetary Nebulae". The Astronomical Journal. 133 (2): 631–638. arXiv:astro-ph/0611543. Bibcode:2007AJ....133..631H. doi:10.1086/510348.
  4. 4.0 4.1 O'Dell, C. R.; McCullough, Peter R.; Meixner, Margaret (2004). "Unraveling the Helix Nebula: Its Structure and Knots". The Astronomical Journal. 128 (5): 2339–2356. arXiv:astro-ph/0407556. Bibcode:2004AJ....128.2339O. doi:10.1086/424621.
  5. Hora, Joseph L.; Latter, William B.; Smith, Howard A.; Marengo, Massimo (2006). "Infrared Observations of the Helix Planetary Nebula". The Astrophysical Journal. 652 (1): 426–441. arXiv:astro-ph/0607541. Bibcode:2006ApJ...652..426H. doi:10.1086/507944.

Coordinates: Sky map 22h 29m 38.55s, −20° 50′ 13.6″