Kirkwood gap
A Kirkwood gap is a gap or dip in the distribution of the semi-major axes (or equivalently of the orbital periods) of the orbits of main-belt asteroids. They correspond to the locations of orbital resonances with Jupiter.
For example, there are very few asteroids with semimajor axis near 2.50 AU, period 3.95 years, which would make three orbits for each orbit of Jupiter (hence, called the 3:1 orbital resonance). Other orbital resonances correspond to orbital periods whose lengths are simple fractions of Jupiter's. The weaker resonances lead only to a depletion of asteroids, while spikes in the histogram are often due to the presence of a prominent asteroid family.
The gaps were first noticed in 1866 by Daniel Kirkwood, who also correctly explained their origin in the orbital resonances with Jupiter while a professor at Jefferson College in Canonsburg, Pennsylvania.
Most of the Kirkwood gaps are depleted, unlike the mean-motion resonances (MMR) of Neptune or Jupiter's 3:2 resonance, due to the overlapping of the ν5 and ν6 secular resonances within the mean-motion resonances. The orbital elements of the asteroids vary chaotically as a result and evolve onto planet-crossing orbits within a few million years. The 2:1 MMR has a few relatively stable islands within the resonance, however. These islands are depleted due to slow diffusion onto less stable orbits. This process, which has been linked to Jupiter and Saturn being near a 5:2 resonance, may have been more rapid when Jupiter's and Saturn's orbits were closer together.
Podcasts:
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by Anthony David
Krooked Kop
by: Anthony Davidoooooooooh hey hey this goes out to.....
you really do think that you can do anything that you wanna do
your protecting us from crime but
whos protecting us from you yea
24hr patrol around the block
never stops the drugs from comin in comin in
yea it kind makes me wonder sometimes just whos really deliverin
always harassin me and askin me for my id but i aint done nothin so you aint seein nothin no
packed me a bag of buddah but i aint the high school shootah
im sure you got bigger fish to fry
chorus
krooked kop leave me alone
go find someone else to
run your game on oh yea (thats my car)
go and tell po watchin my spot
if you dont live here then you dont belong in my neighborhood no
chorus
krooked kop leave me alone
go find someone else to run your game on yea
go and tell po watchin my spot
if you dont live here then you dont belong in my neighborhood
you dont belong in my neighborhood no no no
oh royal lauder of
fraternity brothers
is really just a game oh yea
youd like to hang around and beat brothers down
but you dont wanna change things oh no
it must be a prerec ya
gotta be on a power trail
for you to even join the force
you gotta hate black of course
wont be that way in the future
cuz no ruler reigns forever
what will you do when
its over watcha gonna do when the partys over yeeeah over yes
go find someone to run your game on
go find someone to fool around with
go and tell po watchin my spot
if you dont live here
then you dont belong in my neighborhood
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