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NGC 6884 is a planetary nebula[4] located in the constellation Cygnus, less than a degree to the southwest of the star Ο1 Cygni.[5] It lies at a distance of approximately 12.5 kly from the Sun.[2] The nebula was discovered on May 8, 1883 by American astronomer Edward C. Pickering.[6]

NGC 6884
Emission nebula
Planetary nebula
Hubble Space Telescope (HST) image of NGC 6884
Observation data: J2000 epoch
Right ascension20h 10m 23.64012s[1]
Declination+46° 27′ 39.5478″[1]
Distance12.5 kly (3.830 kpc)[2] ly
Apparent dimensions (V)0.127′[2]
ConstellationCygnus
DesignationsPNG 082.1+07.0[3], NGC 6766[4]
See also: Lists of nebulae

This nebula consists of the cast-off outer atmosphere of an aging star. It is young and compact with a kinematic age of 720 years.[7] The nebula is point-symmetric with arcs forming an S-shaped inner core;[8] the shape is likely explained by bipolar outflows with a velocity of 55 km/s.[7] The core is surrounded by a filamentary ring structure that is inclined at an angle of around 40–45° to the line of sight from the Earth. The core has an overall shape of a prolate ellipsoid with axis ratios of 1.6:1 and is inclined by 40°.[8] The expansion velocity of the nebula ranges over 19–25 km/s. The central star has a temperature of ~100,000 K[7] and a class of WN b?.[3]


References


  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Stanghellini, Letizia; et al. (December 10, 2008). "The Magellanic Cloud Calibration of the Galactic Planetary Nebula Distance Scale". The Astrophysical Journal. 689 (1): 194–202. arXiv:0807.1129. Bibcode:2008ApJ...689..194S. doi:10.1086/592395.
  3. Weidmann, W. A.; Gamen, R. (February 2011). "Central stars of planetary nebulae: New spectral classifications and catalogue". Astronomy and Astrophysics. 526: 16. arXiv:1010.5376. Bibcode:2011A&A...526A...6W. doi:10.1051/0004-6361/200913984. A6.
  4. "NGC 6884". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-10-06.
  5. Sinnott, Roger W.; Perryman, Michael A. C. (1997). Millennium Star Atlas. Vol. 3. Sky Publishing Corporation and the European Space Agency. p. 1108. ISBN 0-933346-84-0.
  6. Seligman, Courtney. "NGC Objects: NGC 6850 - 6899". Retrieved 2020-10-03.
  7. Miranda, Luis F.; et al. (March 1999). "Multiwavelength Imaging and Long-Slit Spectroscopy of the Planetary Nebula NGC 6884: The Discovery of a Fast Precessing, Bipolar Collimated Outflow". The Astronomical Journal. 117 (3): 1421–1432. Bibcode:1999AJ....117.1421M. doi:10.1086/300774.
  8. Palen, Stacy; et al. (May 2002). "Hubble Space Telescope Expansion Parallaxes of the Planetary Nebulae NGC 6578, NGC 6884, NGC 6891, and IC 2448". The Astronomical Journal. 123 (5): 2666–2675. arXiv:astro-ph/0202003. Bibcode:2002AJ....123.2666P. doi:10.1086/339838.



На других языках

[de] NGC 6884

NGC 6884 = NGC 6766 ist ein planetarischer Nebel im Sternbild Schwan. Der Nebel wurde am 8. Mai 1883 von dem US-amerikanischen Astronomen Edward Charles Pickering entdeckt. Ebenfalls beobachtete ihn der schottische Astronom Ralph Copeland am 20. September 1884. Dies führte dazu, dass es mit NGC 6766 einen zweiten Eintrag im NGC für diesen Nebel gibt.[4]
- [en] NGC 6884


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