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Planetary nebula in the constellation of Cygnus From Wikipedia, the free encyclopedia
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]
Emission nebula | |
---|---|
Planetary nebula | |
Observation data: J2000 epoch | |
Right ascension | 20h 10m 23.64012s[1] |
Declination | +46° 27′ 39.5478″[1] |
Distance | 12.5 kly (3.830 kpc)[2] ly |
Apparent dimensions (V) | 0.127′[2] |
Constellation | Cygnus |
Physical characteristics | |
Radius | 0.23 ly |
Designations | PNG 082.1+07.0[3], NGC 6766[4] |
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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