(meteorobs) NASA's "fireball season" - significant effect or myth?
marco.langbroek at online.nl
Fri Apr 5 03:22:13 EDT 2013
Op 5-4-2013 2:03, dfischer at astro.uni-bonn.de schreef:
> As every spring since several years now NASA is claiming again that we are
> in a - mysterious - "fireball season" right now:
> http://svs.gsfc.nasa.gov/vis/a010000/a011200/a011231/index.html ... with
> so many video and all-sky camera networks in operation nowadays in the
> U.S., Europe and Asia, are we any closer to determining whether the
> claimed enhancement in the fireball rate actually exists?
As the ecliptic is higher in the sky in the Northern hemisphere in winter during
nighttime, you can expect more ecliptic fireballs in winter generally: say
October to March.
The second part of that period is when the ecliptic is highest in the sky in the
evening - good for slow grazing fireballs (objects that are "overtaken" by
earth) that attract attention.
The latter effect is why spring/early summer has a slightly elevated number of
meteorite falls, favouring the afternoon and early evening.
I have never seen convincing quantified data showing the existence of true
fireball streams in spring.
Dr Marco (asteroid 183294) Langbroek
Dutch Meteor Society (DMS)
e-mail: dms at marcolangbroek.nl
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