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M57 - TSA102S
M57 - Ring Nebula
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The famously named "Ring Nebula" is
located in the northern constellation of Lyra, and
also catalogued as Messier 57, M57 or NGC 6720. It
is one of the most prominent examples of the
deep-sky objects called planetary nebulae
(singular, planetary nebula), often abbreviated by
astronomers as simply planetaries or PN. M57 is
located in Lyra, south of its brightest star Vega.
Vega is the northeastern vertex of the three stars
of the Summer Triangle. M57 lies about 40% of the
angular distance from β Lyrae to γ Lyrae. M57 is
best seen through at least a 20 cm (8-inch)
telescope, but even a 7.5 cm (3-inch) telescope
will show the ring. Larger instruments will show a
few darker zones on the eastern and western edges
of the ring, and some faint nebulosity inside the
disk.
This nebula was discovered by
Antoine Darquier de Pellepoix in January, 1779,
who reported that it was "...as large as Jupiter
and resembles a planet which is fading." Later the
same month, Charles Messier independently found
the same nebula while searching for comets. It was
then entered into his catalogue as the 57th
object. Messier and William Herschel also
speculated that the nebula was formed by multiple
faint stars that were unable to resolve with his
telescope.
(From Wikipedia, the free encyclopaedia)
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Exposure Data
 | Instrument: Takahashi TSA102S (TOA Reducer/
Flattener) |
| F/stop: 8 |
| Exposure: |
| Camera: Hutech Canon EOS 40D DSLR |
| Sensitivity: ISO 1600 |
| Date: August 28, 2008 |
| Exposure start: |
| Location: Albury, New South Wales |
| Autoguider: None |
| Enhancement: Registar 1.0, Adobe Photoshop CS2,
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| Notes: Piggy backed on LX200 8" GPS, using
Meade Field de-rotator |
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