Planet
Designations
General Information:
In SG1 - Of the 114 planets in the GateWorld omnipedia that are
from SG1, only 1 has a 'M' designation, and that is a planetoid/moon
(M4C-862 in the episode 'Prodigy'). The assumption can then be
made that moons/planetoids are 'M' and planets are 'P'.
In SGA - of the 14 planets in the GateWorld omnipedia that are from
SGA, only 2 have 'P' designations (P3X-447, mentioned by Ford, and
P3M-736, the world they are on, in the episode 'Runner'). It is
unclear how the designations work in Pegasus, as all the 'M' and the
two 'P' designation planets were planets and not moons/planetoids.
As for the configuration of the designations, of the 128 planets in
total on the GateWorld omnipedia, 113 of them follow the Letter,
Number, Letter, Number, Number, Number format (eg P9G-844). In SG1
(only), there are 9 that follow the Letter, Letter, Number, Number,
Number, Number format (eg PJ2-445), and then there are the planets:
PAS-A81, PGG-002, PT1-AA1, PWW-98C, PGG-002, P3X-8596 that don't follow
any specific format.
This information is correct up to and including Season 10 of SG1 and
the Ark of Truth movie and Season 4 of SGA - assuming that the
omnipedia is up-to-date and that I counted correctly!
If you can add to the above, please contact me! Thanks.