Hubble image of the Ring Nebula (Messier 57)
The region around the Ring Nebula (Hubble/LBT composite)
The geometry and structure of the Ring Nebula (Messier 57)
Wide-field image of the Ring Nebula (ground-based image)
Videos
Fly-around and zoom into the Ring Nebula (3D)
The NASA/ESA Hubble Space Telescope has
produced the most detailed observations ever of the Ring Nebula (Messier
57). This image reveals intricate structure only hinted at in previous
observations, and has allowed scientists to construct a model of the
nebula in 3D — showing the true shape of this striking object.
Formed by a star throwing off its outer layers as it runs out of fuel, the Ring Nebula is an archetypal planetary nebula [1].
It is both relatively close to Earth and fairly bright, and so was
first recorded in the late 18th century. As is common with astronomical
objects, its precise distance is not known, but it is thought to lie
just over 2000 light-years from Earth.
From Earth’s perspective, the nebula looks roughly elliptical.
However, astronomers have combined ground-based data with new
observations using the NASA/ESA Hubble Space Telescope to observe the
nebula again, hunting for clues about its structure, evolution, physical
conditions and motion.
It turns out that the nebula is shaped like a distorted doughnut. We
are gazing almost directly down one of the poles of this structure, with
a brightly coloured barrel of material stretching away from us.
Although the centre of this doughnut may look empty, it is actually full
of lower density material that stretches both towards and away from us,
creating a shape similar to a rugby ball slotted into the doughnut’s
central gap.
The brightest part of this nebula is what we see as the colourful
main ring. This is composed of gas thrown off by a dying star at the
centre of the nebula. This star is on its way to becoming a white dwarf —
a very small, dense, and hot body that is the final evolutionary stage
for a star like the Sun.
The Ring Nebula is one of the most notable objects in our skies. It
was discovered in 1779 by astronomer Antoine Darquier de Pellepoix, and
also observed later that same month by Charles Messier, and added to the
Messier Catalogue. Both
astronomers stumbled upon the nebula when trying to follow the path of a
comet through the constellation of Lyra, passing very close to the Ring
Nebula [2].
Notes
[1] Planetary nebulae take their name
from their roughly circular appearance through low-magnification
telescopes. The phenomenon has nothing to do with planets.
[2] Messier 57 was not the only object to be
discovered during the tracking of this comet, named C/1779 A1. Messier
and other astronomers added a handful of other nebulae to the catalogue during this observing period — Messiers 56, 58, 59, 60, and 61.
More information
The Hubble Space Telescope is a project of international cooperation between ESA and NASA.
The research on Messier 57 is described in a set of three papers, two published in The Astronomical Journal:
- “Studies of NGC 6720 with Calibrated HST WFC3 Emission Line Filter Images — I: Structure and Evolution”, available here.
- “Studies of NGC 6720 with Calibrated HST WFC3 Emission Line Filter Images — II: Physical Conditions”, available here.
And a third paper that has been accepted for publication in The Astronomical Journal:
- “Studies of NGC 6720 with Calibrated HST WFC3 Emission Line Filter Images — III: Tangential Motions using AstroDrizzle Images”, available here.
The NASA/ESA Hubble Space Telescope observations used in this image
were led by C. R. O’Dell (Vanderbilt University, USA), G. J. Ferland
(University of Kentucky, USA), W. J. Henney (Universidad Nacional
Autónoma de México, Mexico), and M. Peimbert (Universidad Nacional
Autónoma de México, Mexico).
Image credit: NASA, ESA, and C. Robert O’Dell.
Links
Contacts
C. Robert O’Dell
Department of Physics and Astronomy, Vanderbilt University
Tennessee, USA
Tel: +1-615-343-1779
Email: cr.odell@vanderbilt.edu
Department of Physics and Astronomy, Vanderbilt University
Tennessee, USA
Tel: +1-615-343-1779
Email: cr.odell@vanderbilt.edu
Nicky Guttridge
ESA/Hubble
Garching bei München, Germany
Tel: +49-89-3200-6855
Email: nguttrid@partner.eso.org
ESA/Hubble
Garching bei München, Germany
Tel: +49-89-3200-6855
Email: nguttrid@partner.eso.org
