Ted Molczan wrote: > Here is an exercise. The first elset was issued about 19 h before the > leap second insertion at the end of 1997 Jun 30; the second one about > three after the insertion: > > 1 00271U 62010A 97181.18205596 +.00000006 +00000-0 +10000-3 0 09014 > 2 00271 086.6536 054.4864 0329540 060.7273 302.6159 09.41297471210592 > > 1 00271U 62010A 97182.13850598 +.00000006 +00000-0 +10000-3 0 09063 > 2 00271 086.6543 054.3470 0329535 059.5568 303.7463 09.41297490210680 > > Compare predictions made using both elsets on 1997 Jun 30 and 1997 Jul > 01. When I propagate the first elset to the epoch of the second with SGP-4 I get a position error of 6.7 km. That means 1 sec times orbital velocity for this object as an error. I compared this result using two elsets with also 1 day but no leap second in between and the position error gets down to 0.1 km. So here the leap second is responsible for the position error. Cheers, Sebastian ----------------------------------------------------------------- Unsubscribe from SeeSat-L by sending a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@lists.satellite.eu.org http://www.satellite.eu.org/seesat/seesatindex.html
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