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IC 5217

IC 5217
Emission nebula
Planetary nebula
Filtered Pan-STARRS image of IC 5217, showing the equatorial ring
Observation data: J2000 epoch
Right ascension22h 23m 55.718s[1]
Declination50° 58′ 00.464″[1]
Apparent magnitude (V)12.6[2]
Apparent dimensions (V)7″[2]
ConstellationLacerta
DesignationsPN 100.6 −5.4, HD 212534[3]
See also: Lists of nebulae

IC 5217 is a planetary nebula in the northern constellation of Lacerta.[2] It was discovered in 1904 by Scottish astronomer Williamina Fleming.[4][5] In 1910, the planetary was included as entry No. 5217 in the Second Index Catalogue of Nebulae and Clusters of Stars by J. E. L. Dreyer.[6] It requires a telescope to view, having an apparent visual magnitude of 12.6 and an angular size of 7″.[2]

Spectra indicate the composition of this nebula is relatively homogeneous with only a low level of interstellar absorption.[7] Images of this nebula show bipolar lobes oriented along an east-west axis. These extend up to 15″ from the midpoint. The orientation of the nebula is along a position angle of 92°. An elongated structure around the waist is likely a bright equatorial ring that is being viewed from edge-on, at right angles to the lobes. The ring shows a velocity gradient that increases up to 27 km s–1 on the leading edges. Radio data indicates the ring is a flat disk with a hole in the center.[8]

The central star displays Wolf–Rayet characteristics with a spectral type of WC 7.[9] It has an apparent visual magnitude of 15.5 with an effective temperature in the range 92,000–95,000 K. The nebula was probably formed by an oxygen-rich progenitor. It appears depleted in carbon and helium compared to similar nebulae.[10]

See also

References

  1. ^ a b Vallenari, A.; et al. (Gaia collaboration) (2023), "Gaia Data Release 3. Summary of the content and survey properties", Astronomy and Astrophysics, 674: A1, arXiv:2208.00211, Bibcode:2023A&A...674A...1G, doi:10.1051/0004-6361/202243940, S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. ^ a b c d Harrington, Philip S. (2010), Cosmic Challenge: The Ultimate Observing List for Amateurs, Cambridge University Press, pp. 252–253, ISBN 978-1-139-49368-0.
  3. ^ "IC 5217", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2026-06-25.
  4. ^ Pickering, E. C.; et al. (May 1904), "Stars having peculiar spectra", Astrophysical Journal, 19: 287–289, Bibcode:1904ApJ....19..287P, doi:10.1086/141114.
  5. ^ Seligman, Courtney, "IC Objects: IC 5200 – 5249", Celestial Atlas, retrieved 2026-06-25.
  6. ^ Dreyer, J. L. E. (1910), "Second Index Catalogue of Nebulæ and Clusters of Stars, containing objects found in the years 1895 to 1907; with Notes and Corrections to the New General Catalogue and to the Index Catalogue for 1888-94", Memoirs of the Royal Astronomical Society, 59: 105, Bibcode:1910MmRAS..59..105D.
  7. ^ Czyzak, S. J.; et al. (September 1969), "Spectrophotometric Studies of Gaseous Nebulae. XIV. The Bright Moderate-Excitation Planetary IC 5217", Astrophysical Journal, 157: 1225, Bibcode:1969ApJ...157.1225C, doi:10.1086/150149.
  8. ^ Miranda, L. F.; et al. (September 2006), "IC 5217 as a double-shell, point-symmetric planetary nebula with a very narrow waist", Astronomy and Astrophysics, 456 (2): 591–597, Bibcode:2006A&A...456..591M, doi:10.1051/0004-6361:20065542.
  9. ^ Peña, M.; et al. (March 2001), "Galactic planetary nebulae with Wolf-Rayet nuclei. II. A consistent observational data set", Astronomy and Astrophysics, 367 (3): 983–994, arXiv:astro-ph/0101523, Bibcode:2001A&A...367..983P, doi:10.1051/0004-6361:20000497.
  10. ^ Hyung, Siek; et al. (August 2001), "Abundances in the Planetary Nebula IC 5217", The Astronomical Journal, 122 (2): 954–965, Bibcode:2001AJ....122..954H, doi:10.1086/321171, hdl:2060/20010071244.

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