Astronomy:IC 5217
| Emission nebula | |
|---|---|
| Planetary nebula | |
| File:IC 5217 PanSTARRS.jpg Filtered Pan-STARRS image of IC 5217, showing the equatorial ring | |
| Observation data: J2000 epoch | |
| Right ascension | 22h 23m 55.718s[1] |
| Declination | 50° 58′ 00.464″[1] |
| Apparent magnitude (V) | 12.6[2] |
| Apparent dimensions (V) | 7″[2] |
| Constellation | Lacerta |
| Designations | PN 100.6 −5.4, HD 212534[3] |
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
- ↑ 1.0 1.1 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940. Gaia DR3 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 Harrington, Philip S. (2010), Cosmic Challenge: The Ultimate Observing List for Amateurs, Cambridge University Press, pp. 252–253, ISBN 978-1-139-49368-0, https://books.google.com/books?id=8mQmvT4wpWQC&pg=PA252.
- ↑ "IC 5217". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=IC+5217.
- ↑ Pickering, E. C. (May 1904), "Stars having peculiar spectra", Astrophysical Journal 19: 287–289, doi:10.1086/141114, Bibcode: 1904ApJ....19..287P.
- ↑ Seligman, Courtney, "IC Objects: IC 5200 – 5249", Celestial Atlas, https://cseligman.com/text/atlas/ic52.htm#ic5217, retrieved 2026-06-25.
- ↑ 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.
- ↑ Czyzak, S. J. (September 1969), "Spectrophotometric Studies of Gaseous Nebulae. XIV. The Bright Moderate-Excitation Planetary IC 5217", Astrophysical Journal 157: 1225, doi:10.1086/150149, Bibcode: 1969ApJ...157.1225C.
- ↑ Miranda, L. F. (September 2006), "IC 5217 as a double-shell, point-symmetric planetary nebula with a very narrow waist", Astronomy and Astrophysics 456 (2): 591–597, doi:10.1051/0004-6361:20065542, Bibcode: 2006A&A...456..591M.
- ↑ Peña, M. (March 2001), "Galactic planetary nebulae with Wolf-Rayet nuclei. II. A consistent observational data set", Astronomy and Astrophysics 367 (3): 983–994, doi:10.1051/0004-6361:20000497, Bibcode: 2001A&A...367..983P.
- ↑ Hyung, Siek (August 2001), "Abundances in the Planetary Nebula IC 5217", The Astronomical Journal 122 (2): 954–965, doi:10.1086/321171, Bibcode: 2001AJ....122..954H.
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