NGC 6884
| Emission nebula | |
|---|---|
| Planetary nebula | |
 Hubble Space Telescope(HST) image of NGC 6884 | |
| Observation data:J2000epoch | |
| Right ascension | 20h10m23.64012s[1] |
| Declination | +46° 27′ 39.5478″[1] |
| Distance | 12.5kly(3.830kpc)[2]ly |
| Apparent dimensions (V) | 0.127′[2] |
| Constellation | Cygnus |
| Physical characteristics | |
| Radius | 0.23 ly |
| Designations | PNG 082.1+07.0[3],NGC6766[4] |
NGC 6884is aplanetary nebula[4]located in theconstellationCygnus,less than a degree to the southwest of the starΟ1Cygni.[5]It lies at a distance of approximately 12.5klyfrom theSun.[2]The nebula was discovered on May 8, 1883, by American astronomerEdward C. Pickering.[6]
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 of55 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 prolateellipsoidwith 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 aclassofWN b?.[3]
References
[edit]- ^abBrown, A. G. A.;et al. (Gaia collaboration) (August 2018)."GaiaData 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 sourceatVizieR.
- ^abcStanghellini, 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.S2CID119257242.
- ^abWeidmann, 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.S2CID118704591.A6.
- ^ab"NGC 6884".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved2020-10-06.
- ^Sinnott, Roger W.; Perryman, Michael A. C. (1997).Millennium Star Atlas.Vol. 3. Sky Publishing Corporation and the European Space Agency. p. 1108.ISBN0-933346-84-0.
- ^Seligman, Courtney."NGC Objects: NGC 6850 - 6899".Retrieved2020-10-03.
- ^abcMiranda, 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.
- ^abPalen, 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.S2CID119426665.
External links
[edit]
Media related toNGC 6884at Wikimedia Commons
