NGC 6884 information

NGC 6884
Emission nebula
Planetary nebula
	Hubble Space Telescope (HST) image of NGC 6884
Observation data: J2000 epoch
Right ascension	20h 10m 23.64012s
Declination	+46° 27′ 39.5478″
Distance	12.5 kly (3.830 kpc) ly
Apparent dimensions (V)	0.127′
Constellation	Cygnus
Physical characteristics
Radius	0.23 ly
Designations	PNG 082.1+07.0, NGC 6766
	See also: Lists of nebulae

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]

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]

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^ ^a ^b ^c Cite error: The named reference Stanghellini2008 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference Weidmann2011 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference simbad was invoked but never defined (see the help page).
^ Cite error: The named reference Sinnott1997 was invoked but never defined (see the help page).
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^ ^a ^b ^c Cite error: The named reference Miranda1999 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference Palen2002 was invoked but never defined (see the help page).

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[Stanghellini2008-2] Cite error: The named reference Stanghellini2008 was invoked but never defined (see the help page).

[Weidmann2011-3] Cite error: The named reference Weidmann2011 was invoked but never defined (see the help page).

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[Sinnott1997-5] Cite error: The named reference Sinnott1997 was invoked but never defined (see the help page).

[cseligman-6] Cite error: The named reference cseligman was invoked but never defined (see the help page).

[Miranda1999-7] Cite error: The named reference Miranda1999 was invoked but never defined (see the help page).

[Palen2002-8] Cite error: The named reference Palen2002 was invoked but never defined (see the help page).

NGC 6884 information

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NGC 6884

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61 Cygni

Sadr Region

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P Cygni