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Chip
2002-Mar-28, 05:31 PM
Posted from Space.com. Interesting eh? /phpBB/images/smiles/icon_wink.gif

http://www.space.com/scienceastronomy/solarsystem/second_moon_991029.html

GrapesOfWrath
2002-Mar-28, 05:50 PM
Lorenzo mentioned it (http://www.badastronomy.com/phpBB/viewtopic.php?topic=159&forum=1&start=30). It's called Cruithne.

The Bad Astronomer
2002-Mar-28, 06:10 PM
Check here too (http://www.badastronomy.com/bitesize/3753.html).

Chip
2002-Mar-28, 11:10 PM
Wow. I didn't know that. I like the animations on Wiegert's page too. Cruithne's orbit around the Sun is further complicated when viewed on edge with Earth's. The series of arcs it makes almost outline a curved bowl-like shape. Weird!

Phil writes:
"These types of orbits were known to be possible theoretically for a long time, but it wasn't until Voyager went to Saturn that actual objects were found that orbited this way."

I recently posted a link about two small moons of Saturn that actually swap positions during their orbit. I thought you had a Bitesized item about them but didn't locate it this time.

I realize Cruithne is orbiting the Sun in this strange way, but with regard to captured asteroids orbiting the Earth as Earth goes around the Sun, would it be possible for a tiny moon, invisible from Earth, that is basketball sized or even Volkswagen sized to go undetected in an Earth orbit? Could it orbit us a little closer in or further out from our familiar big Moon?

Or does the gravitational interaction of the Earth/Moon system itself tend to eventually sweep the area around our planet clean of new little lunarlike upstarts?

Chip

* (and in turn, the Sun as the Earth/Moon system orbits it,)

<font size=-1>[ This Message was edited by: Chip on 2002-03-29 02:02 ]</font>

Hat Monster
2002-Mar-29, 06:38 PM
There was an extensive search done for a second moon of Earth. Some astrologers still use it, "Lilith" they call it.
It's ********.

What we do have is a patch of light about twice as difficult as the geigenschein in the trojan points of the more well known Moon's orbit. Just a bit of dust hanging there.

It's just not possible to have another moon in there. Luna is just too massive. Have two massive objects in a system and they'll expel anything else. Asteroids routinely hang around for an orbit or two before getting kicked out. Anything orbitting Luna is kicked out because of the mascons and perturbations from Earth.
_________________
"We want a few mad people now. See where the sane ones have landed us!" - George Bernard Shaw

<font size=-1>[ This Message was edited by: Hat Monster on 2002-03-29 13:41 ]</font>

GrapesOfWrath
2002-Mar-30, 04:01 AM
On 2002-03-29 13:38, Hat Monster wrote:
There was an extensive search done for a second moon of Earth. Some astrologers still use it, "Lilith" they call it.

Thanks for the info, Hat. With it, I found this webpage by the notorious Paul Schlyter (http://nomusic.hispeed.com/2ndmoon.html). Good read.