OIG orbit elements include "mean motion" in revs/day. This is normally revs measured from perigee to perigee, but in some old elements the data does not fit this definition. Example from http://hea-www.harvard.edu/QEDT/jcm/space/elements/disk1/00400/S00424 1 00424U 63349.11300369 -.00000170 00000-0 0 203 2 00424 80.4713 91.6706 0017354 275.3552 84.4470 13.66095625 60302 at/Z60S 1 00424U 63365.60122080 .00000345 00000-0 0 211 2 00424 80.4875 75.5042 0027501 194.8387 165.0807 13.66091969 62557 at/Z60S 1 00424U 64020.60696148 .00000344 00000-0 0 221 2 00424 80.4875 55.8521 0027434 143.5005 216.6867 13.65348028 65285 at/Z60S 1 00424U 64020.60696172 .00000345 00000-0 0 229 2 00424 80.4875 55.8521 0027434 143.5005 216.6867 13.66105769 65289 at/Z60S 1 00424U 64041.49202226 .00000060 00000-0 0 237 2 00424 80.4734 35.3073 0030027 114.1196 246.1947 13.66098609 68133 at/Z60S 1 00424U 64071.17068313 .00000000 00000-0 0 247 2 00424 80.4748 6.1623 0030690 59.9480 300.3560 13.66101054 72186 at/Z60S 1 00424U 64110.37564562 .00000443 00000-0 0 252 2 00424 80.4721 327.6648 0022611 313.1602 46.6510 13.65339186 77537 The epochs clearly show that the mean motion is about 13.653 as seen on 64020.60696148 and 64110.37564562 (and all later elements). The mean motions near 13.661 are clearly wrong. A similar problem occurs in some other old satellites. Can anyone explain what the 13.661 is? (if not I will investigate) Mike Waterman mike.waterman@marconi.com ----------------------------------------------------------------- Unsubscribe from SeeSat-L by sending a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@lists.satellite.eu.org http://www2.satellite.eu.org/seesat/seesatindex.html
This archive was generated by hypermail 2b29 : Tue May 08 2001 - 02:38:30 PDT