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Old 01-12-2006, 12:28 AM
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Blue Skies (Jacquie)
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Perihelion, perigee, peri-?

For a long time I've wanted to put together a list of all the peri- terms for the solar system i.e. the term for the point of closest approach to an object in an orbit. I've only got a few so far:

Sun - perihelion
Earth - perigee
Moon - pericynthion
Jupiter - perijove

Anyone else know of any others?
I have an idea that the term for Venus is something like pericytherion but I haven't confirmed it. I've alos been on the look out for the term for Saturn with the Cassini spaceprobe but it hasn't surfaced yet either.
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Old 01-12-2006, 01:02 AM
stephenmcnelley
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uhmm, periscope, they go up and down sometimes... , hic!!
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Old 01-12-2006, 01:12 AM
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mojo (Terry)
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periastron - binary star

perigalacticon...
http://www.daviddarling.info/encyclo...alacticon.html
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Old 01-12-2006, 01:19 AM
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Blue Skies (Jacquie)
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Yes, I have heard of periastron before, but I'm more keen to get the terms for solar system objects, if there are any.
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Old 01-12-2006, 01:26 AM
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mojo (Terry)
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Perikrone - Saturn

Terminology heading...
http://en.wikipedia.org/wiki/Perihelion
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Old 01-12-2006, 08:47 AM
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sheeny (Al)
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Quote:
Originally Posted by stephenmcnelley
uhmm, periscope, they go up and down sometimes... , hic!!
Is that closest approach to the scope of the planet or the observer???

Al.
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Old 01-12-2006, 08:57 AM
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[1ponders] (Paul)
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periapsis - point in an orbit when two objects are closest together
peridotite - asteroid/meteorite formed of olivene and pyroxene
periodic - as in comet
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Old 01-12-2006, 02:08 PM
AGarvin
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In Apollo 13, they refer to "PC +2 burn data" ...... Engine burn at pericynthion +2 hours. Just a bit of useless but kinda related trivia .

Last edited by AGarvin; 01-12-2006 at 06:50 PM.
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Old 03-12-2006, 12:32 AM
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Blue Skies (Jacquie)
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Quote:
Originally Posted by mojo
Perikrone - Saturn

Terminology heading...
http://en.wikipedia.org/wiki/Perihelion
Ah, Wikipedia! I must remember to start using it more. Thanks for the link.
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