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Dátum: 2008-07-15 22:14:00
Feladó: Kiss Laszlo
Tárgy: kappa Cygnidak
Ha mar nyar, ha mar kappa Cygnidak,
angolul tudoknak par erdekes allitas:

Until recently, the kappa Cygnids
(IAU#12) were considered an old
shower, because the meteors were
significantly dispersed in node,
radiant, and speed, despite being
28-38° inclined. In 1993, an outburst
of kappa Cygnids was observed, which
implied that this meteoroid stream was
relatively young, instead. At least
some dust was still concentrated in
dust trailets. Until now, no active
comet parent body was known, however,
and the wide 22° dispersion of nodes
was difficult to explain. This work
reports that a minor planet has been
discovered that has the right orbital
dynamics to account for the kappa
Cygnids. Minor planet 2008 ED69 is
intrinsically bright, with H = 16.7
0.3, and moves in a highly inclined
orbit (i = 36.3°). With one node near
Jupiter´s orbit, the perihelion
distance, longitude of perihelion, and
node quickly change over time, but in
a manner that keeps dust concentrated
for a long period of time. The stream
is more massive than the remaining
body, and a form of fragmentation is
implicated. A break-up, leaving a
stream of meteoroids and at least the
one remaining fragment 2008 ED69, can
account for the observed dispersion of
the kappa Cygnids in Earth´s orbit, if
the formation epoch is about 2-3
nutation cycles ago, dating to around
4000-1600 BC. Most of that debris now
passes close to the orbit of Venus,
making the kappa Cygnids a significant
shower on Venus.

(Jenniskens & Vaubaillon, AJ, 2008.
augusztus).

Szoval a venuszlakok is eszlelhetik a
kappa Cygnidakat...

Ksl
Vissza

  

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