Slocum@HI-MULTICS.ARPA (02/20/86)
When one is refering to Earth, the prefix 'geo-' is used.
Similarly, the prefix for Sol is 'helio-'.
Could someone tell me what the prefixes for the other planets
would be? For instance, is it lunocentric or selenocentric.
What would the equivalent to perigee, perihelion, apogee, and
aphelion be for the other planets?
Brett Slocum
(Slocum\@HI-MULTICS)space@ucbvax.UUCP (02/22/86)
I believe that 'geo-' means 'earth' (not Earth), and would be fine for any planet. 'helio' means sun, suitable for any star. Barb
space@ucbvax.UUCP (02/23/86)
In article <8602212220.AA07320@oliven.ICO> you write: >I believe that 'geo-' means 'earth' (not Earth), and would be >fine for any planet. > > 'helio' means sun, suitable for any star. > >Barb It would be nice if those terms were to be used generically. I just wanted to point out that other terms have been defined (and are in use). periastron - that point in the orbit of a star or other celestial body where it is nearest to the primary star around which it is revolving. apojove - the point farthest from the planet Jupiter in the orbit of each of its satellites Other terms have been similarly defined. (No, I don't have a complete list.) Kim Althoff ihnp4!pesnta!kima
wombat@ccvaxa.UUCP (02/23/86)
The following is things I remember and things found in *Modern Spacecraft Dynamics & Control* by Marshall Kaplan: The generic terms are periapsis and apoapsis. The affix for the moon seems to be -lune. Most of the problem seems to be avoided by refering to subscripted variables from various equations. The subscripts are standard symbols for the planets: circle with dot in center for the sun, circle with cross inside for the earth, crescent for the moon, circle with cross below for Venus, and so on. I seem to remember -jove being the affix for Jupiter. For the other planets, if you want to talk about something other than periapsis or apoapsis, it looks like you can use geo- as long as the context makes clear which planet you're discussing. As an aside, Kaplan is a reasonable textbook with wonderful end-of-chapter problems. "When you are about to die, a wombat is better than no company at all." Roger Zelazny, *Doorways in the Sand* Wombat ihnp4!uiucdcs!ccvaxa!wombat
brent@poseidon.UUCP (Brent P. Callaghan) (02/25/86)
I can remember during the Apollo program that the CSM was
inserted into lunar orbit at "pericynthion".
Now how did Cynthia get into all this... :-)
--
Made in New Zealand --> Brent Callaghan
AT&T Information Systems, Lincroft, NJ
{ihnp4|mtuxo|pegasus}!poseidon!brent
(201) 576-3475dietz@SLB-DOLL.CSNET (Paul Dietz) (02/25/86)
More on postfixes for orbital terms: peribarythron -- closest approach of an orbit to a black hole.