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Comet
Comet
C/2012 E2 (SWAN)
was a
Kreutz group
sungrazing comet
discovered by Vladimir Bezugly in publicly available images taken by the
SWAN instrument
(
Solar Wind ANisotropies
) on board the
SOHO spacecraft
. It is recognized for being the first
Kreutz sungrazer
observed in SWAN imagery.
Discovery
[
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]
On March 8, 2012, Ukrainian amateur astronomer Vladimir Bezugly reported an unknown comet in 3 images taken by the SWAN instrument on board the SOHO spacecraft. Further study of this object revealed that it was a Kreutz group sungrazer with a perihelion date on March 15, 2012. This was particularly interesting because no Kreutz sungrazer had ever been bright enough to be observed by the SWAN cameras, not even Comet
C/2011 W3 (Lovejoy)
which was visible to the naked-eye three months earlier. This meant that Comet SWAN had a chance of being an exceptionally bright comet.
[1]
SECCHI and LASCO Observations
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The SECCHI HI1 camera on board the STEREO-B spacecraft was the first to observe the comet after the SWAN instrument. It entered the field of view on March 11 and appeared reasonably bright, though not as bright as it could have been.
The comet entered the visibility of
SOHO
's LASCO telescopes on March 13, there too the comet did not appear exceptionally bright, it was fainter in comparison to Comet
C/2011 W3 (Lovejoy)
at this stage of its orbit. Though it certainly appeared brighter than most sungrazing comets of the Kreutz group. It reached a maximum apparent brightness of mag +1 before it declined in brightness due to disintegration. The comet did not survive
perihelion
.
SECCHI's COR instruments on both
STEREO
spacecraft also observed the comet's final moments.
[2]
[1]
[3]
Other observations
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The reason of the comet's brightness in SWAN remains unknown, though it is thought that the comet experienced an outburst a few days before discovery which rendered it much brighter than it was otherwise.
[1]
No ground-based observations of the comet were available.
Due to a short 2-day
observation arc
, the long-term trajectory of the comet is poorly constrained. The
orbital period
is unknown with an
orbital inclination
of 144 degrees.
[4]
References
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]
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