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NGC 1535

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NGC 1535
Emission nebula
Planetary nebula
NGC 1535 using the 0.8m Schulman Telescope from the Mount Lemmon SkyCenter
Observation data: J2000 epoch
Right ascension04h 14m 15.782s[1]
Declination−12° 44′ 21.68″[1]
Distance5500–7500 ly   (1740–2310[2] pc)
Apparent magnitude (V)9.6[3]
Apparent dimensions (V)20″[3]
ConstellationEridanus[3]
Designations2MASX J04141578-1244216, IRAS 04119-1251, PN G 206.4-40.5, PK 206-40.1, dML87 112, UITBOC 627, VERA J0414-1244
See also: Lists of nebulae

NGC 1535 is a planetary nebula in the equatorial constellation of Eridanus.[3] It is known as Cleopatra's Eye,[4] and is located around 5500-7500 light years away from Earth. This nebula was discovered by German-British astronomer William Herschel on February 1, 1785.[5] The object is included in the Astronomical League's Herschel 400 Observing Program.[6]

Characteristics

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It is very similar to the Eskimo Nebula in both color and structure. It has a round exhibiting moderate ellipticity.[7] The dust distribution inside NGC 1535 is uniform and nearly round in shape. It displays a dust halo with a noticeable inner ring of increased intensity.[8][9] Outside this ring is a faint oval disk, note quite symmetrical with the main nebula. This region shows faint traces of ring formation in the southeastern region.[7][10] The nebula seems to have formed in a somewhat metal-poor region having undergone little or no enhancement of elements mixing with nuclear-processed material.[11]

NGC 1536 is a bright, high-excitatory nebula.[12] Spectra of NGC 1535 from ROSAT reveal of “double hump” shape with approximately one-third of the photons are within the high energy range with more than 0.5 keV. These high energies could not simply have been produced by a stellar photosphere, even with the central star having a temperature of 250,000 Kelvin.[13]

Observations by Leahy et al. using ROSAT reported X-ray emissions from NGC 3587 and NGC 1535. However comparisons between optical and X-ray images shows that these X-ray emissions coincide with a star that was outside the optical boundary of the nebula. This would make previous reports of X-ray emission from NGC 1535 likely false. Observations were taken using ROSAT High Resolution Imager which clearly confirms that the X-ray emissions contain three peaks that are point sources (RX J111447.9+550106, RX J111450.9+550208, and RX J111504.9+550141). Only the first of these sources are projected to be from the central star.[14]

Central star

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At the center of NGC 1535, there is a O-type star with a spectral type of O(H)5. It is difficult to visually observe with a magnitude of 10. This star has a mass of 0.59☉ and a temperature of 66,000 Kelvin.[15][16] The star produces stellar winds with a terminal velocity of about 200 km/sec. These stellar winds are suspected to be the dominant force, shaping the morphology of the nebula to a round shape.[17][18]

References

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  1. 1 2 "NGC 1535". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 11 July 2015.
  2. ↑ Smith, H. (9 April 2015). "On the distances of planetary nebulae". Monthly Notices of the Royal Astronomical Society. 449 (3): 2980–3005. arXiv:1409.3422. Bibcode:2015MNRAS.449.2980S. doi:10.1093/mnras/stv456.
  3. 1 2 3 4 Finlay, Warren H. (2014). Concise Catalogue of Deep-Sky Objects. The Patrick Moore Practical Astronomy Series (2nd ed.). Springer Cham. p. 178. doi:10.1007/978-3-319-03170-5. ISBN 978-3-319-03169-9.
  4. ↑ Stoyan, Ronald; Schurig, Stephan (2014). interstellarum Deep Sky Atlas. Erlangen: Cambridge University Press; Oculum-Verlag GmbH. ISBN 978-1-107-50338-0. OCLC 920437579.
  5. ↑ Seligman, Courtney. "Celestial Atlas: NGC Objects: NGC 1500 - 1549". cseligman.com. Archived from the original on 1 January 2016. Retrieved 11 July 2015.
  6. ↑ "The Herschel 400 Club Observing List in New General Catalog (N.G.C.) Number Order" (PDF). The Astronomical League. Retrieved 2024-03-05.
  7. 1 2 "The planetary nebulae NGC 1535 and NGC 2022". ui.adsabs.harvard.edu. Retrieved 2026-05-26.
  8. ↑ "Best of AOP - Planetary Nebulae: NGC 1535". Caelum Observatory (mirror of NOAO/AOP. NOAO. Archived from the original on 13 July 2015. Retrieved 11 July 2015.
  9. ↑ R A Pignata, W A Weidmann, E O Schmidt, A Mudrik, D Mast, Dust distribution in planetary nebulae, Monthly Notices of the Royal Astronomical Society, Volume 528, Issue 1, February 2024, Pages 459–480, https://doi.org/10.1093/mnras/stad3568
  10. ↑ "Part III. The Planetary Nebulae". ui.adsabs.harvard.edu. Retrieved 2026-05-26.
  11. ↑ Barker, Timothy (1989-05-15). "The ionization structure of planetary nebulae. IX - NGC 1535". Astrophysical Journal, Part 1. 340. ISSN 0004-637X.
  12. ↑ Louise, R. & Pascoli, G.. (1985). Study of three high excitation planetary nebulae in the Southern Hemisphere - NGC 1535, NGC 2440, NGC 2452. Astronomy and Astrophysics. 150. 285-297.
  13. ↑ "ROSAT X-Ray Observations of Four Planetary Nebulae". ui.adsabs.harvard.edu. Retrieved 2026-05-26.
  14. ↑ "ROSAT X-Ray Observations of Two Planetary Nebulae: NGC 1535 and NGC 3587". ui.adsabs.harvard.edu. Retrieved 2026-05-26.
  15. ↑ 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.
  16. ↑ Pottasch, S. R.; Surendiranath, R.; Bernard-Salas, J. (2011-07-01). "Abundances in planetary nebulae: NGC 1535, NGC 6629, He2-108, and Tc1". Astronomy & Astrophysics. 531: A23. arXiv:1107.4041. doi:10.1051/0004-6361/201116669. ISSN 0004-6361.
  17. ↑ Adam, J. & Köppen, J.. (2017). Influence of the Stellar Wind on the Nebular Ionization in NGC 1535 and 4361. Symposium - International Astronomical Union. 103. 338-339. 10.1017/S0074180900093888.
  18. ↑ "Unexpected bi-polar motions in the planetary nebula NGC 1535". ui.adsabs.harvard.edu. Retrieved 2026-05-26.
[edit]
  • Wikimedia Commons logo Media related to NGC 1535 at Wikimedia Commons
  • "NGC 1535". Mt. Lemmon SkyCenter. University of Arizona. Archived from the original on 2016-08-26. Retrieved 2015-12-26.
  • "Cleopatra's Eye (NGC 1535)". Observing at Skyhound.
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