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Астронет: Астрономическая картинка дня Метеорный дождь Леонид 1999 года http://variable-stars.ru/db/msg/1162829/eng |
Credit & Copyright: Juan Carlos Casado
Explanation:
The 1999 Leonids meteor shower was not equally good for everybody.
Only observers in Europe and the Middle East with clear skies near
2 am (UTC) on 1999 November 18 saw rates
shoot up to a meteor every few seconds.
Above, however, is a picture taken from Spain
during this time, with over a dozen faint
meteors visible as
green streaks eminating from
Leo during just
a six minute exposure.
Although more numerous, the
1999 Leonids did not have the same
high proportion of bright meteors and fireballs as the
1998 Leonids.
Last year's Leonid fireballs
have been
traced back to the 1333 passage of
Comet Tempel-Tuttle.
The orbit of Jupiter continually deflected one stream of
cast-off particles while the smallest
meteors in
this stream were removed by light pressure from the Sun.
The remaining Leonids were relatively large,
pea sized or larger, compared to the sand-sized Leonids that are more common.
Authors & editors:
Robert Nemiroff
(MTU) &
Jerry Bonnell
(USRA)
NASA Web Site Statements, Warnings,
and Disclaimers
NASA Official: Jay Norris.
Specific
rights apply.
A service of:
LHEA at
NASA /
GSFC
& Michigan Tech. U.