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 Post subject: Re: Meteor shower currently in action...
Unread postPosted: Fri Aug 21, 2009 10:36 am 
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For all who do not know what leonids are:

Earth will be moving through the meteoroid stream of particles left from the passages of the comet. The stream comprises solid particles, known as meteoroids, ejected by the comet as its frozen gases evaporate under the heat of the Sun which begins to warm the comet as it comes within the orbit of Jupiter.
A typical particle is no bigger than fine dust. The main source of light of a meteor is caused by the air molecules ramming the meteoroid, which fragments and atomizes the dust, and the resulting spray of microscopic debris collides with individual atoms of the atmosphere ionizing the air. The air molecules recombine and cool by giving off photons.
Larger particles leave a stream of smaller particles and form a bolide or fireball, which can leave a glowing trail in the atmosphere. Leonids in particular are well known for having such bright meteors, the meteoroids left by the comet are organized in trails in orbits similar though different from that of the comet.

They are differentially disturbed by the planets, in particular Jupiter. The ensemble of the trails compose the meteoroid stream, old trails are spatially not dense and compose the meteor shower background (a few meteors per minute) which will be happening around November 17, but changing every year. Conversely, young trails are spatially very dense and the cause of meteor storms when the Earth enters one of these structures. Usual counts during a storm exceed 500 meteors per hour, to be compared to the annual background (1 to 2 meteors per hour) and the shower background (a few per hour).

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 Post subject: Re: Meteor shower currently in action...
Unread postPosted: Fri Aug 21, 2009 1:08 pm 
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iLoveMeerkats! wrote:
I have booked a "best river view" bungalow in Olifants Nov 19 and 20. Do you think this will be a good place to watch the Leonids?
It certainly would be a good place to observe the Leonids from and while, as bentley said, the 19th will be one day past the peak. Expectations are that this year's Leonids will be particularly good with as many as 500 or more meteors per hour but you could probably expect something closer to 50 (which is still almost one every minute).

Perhaps the worst bit of bad news I have for you is that the constellation of Leo will only be visible from about 02:00 in the morning as it rises over the eastern horizon. I would guess your best chances of seeing meteorites would be between 03:00 and 04:00 when Leo has risen properly above the horizon and before the twilight gets too bright. The Leonid's point of origin is somewhere in the head of Leo.

bentley wrote:
Usual counts during a storm exceed 500 meteors per hour, to be compared to the annual background (1 to 2 meteors per hour) and the shower background (a few per hour).

The definition of a meteor storm (as opposed to a meteor shower) is one in which 1000 or more meteors are recorded per hour. The Leonids produce a meteor storm about once every 33 years and while they should be good this year, they're not expected to reach storm level.

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 Post subject: Re: Meteor shower currently in action...
Unread postPosted: Sat Aug 22, 2009 10:04 am 
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Deefstes -
Quote:
The definition of a meteor storm (as opposed to a meteor shower) is one in which 1000 or more meteors are recorded per hour


:big_eyes: Apollogies for the incorrect info of 500, followed up on it...Deefstes is 100% right there :wink:

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 Post subject: Re: Meteor shower currently in action...
Unread postPosted: Sat Aug 22, 2009 6:56 pm 
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Thanks for the info. I had seen a calendar somewhere that said the 20th was the peak. Oh well.
No problem with the time...we will be getting up early to be out the gate at opening so I guess we will just get up a bit earlier. Breakfast and meteors sounds good to me! :D


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 Post subject: Re: Meteor shower currently in action...
Unread postPosted: Sat Aug 22, 2009 7:01 pm 
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What about best time on the 17th and 18th. The same???


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 Post subject: Re: Meteor shower currently in action...
Unread postPosted: Sat Aug 22, 2009 8:58 pm 
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Missed the meteorite showers here due to low cloud and light polution, however will be in SA Sept - Nov but will be in the area of Cape town on the 17th Nov will we be able to see them there?


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 Post subject: Re: Meteor shower currently in action...
Unread postPosted: Mon Aug 24, 2009 10:24 am 
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Predictions are estimated that peak is on November 17 between 21:34 - 21:44 universal time, viewing of the shower will be visible in some certain parts of the world as early as the 15th through to the 19th of Nevember.

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 Post subject: Re: Meteor shower currently in action...
Unread postPosted: Wed Oct 21, 2009 8:18 pm 
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Hey everybody got an e-mail containing the following info on a meteor shower!

Quote:
The annual Orionid meteor shower should be at its best tonight. Don't expect too many - maybe one every minute or two if you're in a really dark place.

No equipment is needed, just:
* go outside sometime between 11:30pm tonight (when Orion rises) and dawn
* look roughly towards Orion (east at midnight, north at dawn)
* look for meteors ("shooting stars") going over your head
Easiest is to lie on the ground with your feet towards Orion, and look up.

Shooting stars are tiny grains of rock hitting the atmosphere so hard they burn up. Each year around October 20th, the Earth ploughs through a cloud of material left by Halley's Comet, hitting debris at about 230,000 km/hr.


I already saw 2 last night will be watching again tonight! Who's joing me? :pray:


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 Post subject: Re: Meteor shower currently in action...
Unread postPosted: Wed Oct 21, 2009 8:40 pm 
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Switch on the kettle, PL. I'm on my way! :wink:

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 Post subject: Re: Meteor shower currently in action...
Unread postPosted: Wed Oct 21, 2009 9:32 pm 
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Thanx for that info pantera leo...will see what I can see from the City Bowl of Cape Town...might be a bit bright!

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 Post subject: Re: Meteor shower currently in action...
Unread postPosted: Thu Oct 22, 2009 1:13 am 
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Shoot, up at 03H00 to see what was cooking and not a moving light in the sky :cry:

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 Post subject: Re: Meteor shower currently in action...
Unread postPosted: Mon Nov 09, 2009 11:09 pm 
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Hi there all..it's been a while.

Just wanted to give every one a heads up to keep them eyes peeled from the 15th - 19th November..The leonids shower will be happening, peak will be on the 17th and estimated viewing times are between 3am & 4am South African time , and between 21:45 & 22:45 universal time.

Will keep you updated as the days pass by..

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 Post subject: Re: Meteor shower currently in action...
Unread postPosted: Mon Nov 09, 2009 11:57 pm 
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Thanks! :thumbs_up:

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 Post subject: Re: Meteor shower currently in action...
Unread postPosted: Tue Nov 10, 2009 9:01 am 
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Great thanks! Seems it's going to be a few late nights again! :thumbs_up:


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 Post subject: Re: Meteor shower currently in action...
Unread postPosted: Tue Nov 17, 2009 7:04 pm 
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Has anyone seen anything?

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