Stellar voyage of a butterfly-like planetary nebula

The breathtaking butterfly-like planetary nebula NGC 6881 is visible here in an image taken by the NASA/ESA Hubble Space Telescope. Located in the constellation of Cygnus, it is formed of an inner nebula, estimated to be about one fifth of a light-year across, and symmetrical “wings” that spread out about one light-year from one tip to the other. The symmetry could be due to a binary star at the nebula’s centre.

NGC 6881 has a dying star at its core which is about 60% of the mass of the Sun. It is an example of a quadrupolar planetary nebula, made from two pairs of bipolar lobes pointing in different directions, and consisting of four pairs of flat rings. There are also three rings in the centre.

A planetary nebula is a cloud of ionised gas, emitting light of various colours. It typically forms when a dying star — a red giant — throws off its outer layers, because of pulsations and strong stellar winds.

The star’s exposed hot, luminous core starts emitting ultraviolet radiation, exciting the outer layers of the star, which then become a newly born planetary nebula. At some point, the nebula is bound to dissolve in space, leaving the central star as a white dwarf — the final evolutionary state of stars.

The name “planetary” dates back to the 18th century, when such nebulae were first discovered — and when viewed through small optical telescopes, they looked a lot like giant planets.

Planetary nebulae usually live for a few tens of thousands of years, a short phase in the lifetime of a star.

The image was taken through three filters which isolate the specific wavelength of light emitted by nitrogen (shown in red), hydrogen (shown in green) and oxygen (shown in blue).

Credit:

ESA/Hubble & NASA

About the Image

Id:potw1211a
Type:Observation
Release date:12 March 2012, 10:00
Size:532 x 532 px

About the Object

Name:NGC 6881
Type:• Milky Way : Nebula : Type : Planetary
• X - Nebulae Images/Videos
Constellation:Cygnus


Image Formats

Large JPEG
129.0 KB
Screensize JPEG
273.7 KB

Wallpapers

1024x768
278.9 KB
1280x1024
404.1 KB
1600x1200
514.9 KB
1920x1200
551.8 KB
2048x1536
718.8 KB

Coordinates

Position (RA):20 10 52.32
Position (Dec):37° 24' 43.96"
Field of view:0.40 x 0.40 arcminutes
Orientation:North is 185.6° right of vertical
View in WorldWide Telescope:
View in WorldWide Telescope

Colours & filters

BandWavelengthTelescope
Optical
H-alpha
656 nm Hubble Space Telescope
WFPC2
Optical
OIII
502 nm Hubble Space Telescope
WFPC2
Optical
NII
658 nm Hubble Space Telescope
WFPC2

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