Re: New Iridium Elsets
Bjoern Gimle (bjorn@tt-tech.se)
Fri, 15 May 1998 13:31:52 +0200
Keith Stein <kstein@launchspace.com> wrote:
> >
> >> Delta/Iridium Nominal Orbit Data
..
> >> PERIOD (MIN): 97.478 97.267
> >> ...
> >> PERIOD (MIN): 97.267 97.172
> >> ...
> >> PERIOD (MIN): 97.113 92.734
> >> ...
> >(snip)
> >
> >
Jim Varney <jamesv@softcom.net> wrote:
> >"
> >Roughly translated to TLE's (with wild guesses for drag) I get:
> >
> >2 90000 086.583 265.2570 0003410 119.1820 253.8990 14.77260425000000
..
> >2 90000 086.580 265.2550 0013920 194.3570 215.7060 14.80461050000000
..
> >2 90000 086.579 265.2530 0017460 219.0050 206.4410 14.81905132000000
..
> >2 90000 086.579 265.2510 0018820 241.5390 199.2790 14.82802449000000
..
> >2 90000 086.579 265.2490 0017280 262.9760 193.2100 14.82899900000000
My guess is that the given periods are nodal. Iridium perigees precess
by +3.6 degrees/day. Correct me if either of these assumptions are wrong!
If so, Jim's MM should be reduced by 0.01:
Iridium SV4 SEP 637 x 610
1 90004U 98999D 98135.95064815 .00000600 +00000-0 60000-4 0 00000
2 90004 086.579 265.2510 0018820 241.5390 199.2790 14.81802449000008
Iridium SV5 SEP 635 x 611
1 90005U 98999E 98135.95354167 .00000600 +00000-0 60000-4 0 00003
2 90005 086.579 265.2490 0017280 262.9760 193.2100 14.81899900000009
Iridium SV3 SEP 639 x 614
1 90003U 98999C 98135.94775463 .00000600 +00000-0 60000-4 0 00006
2 90003 086.579 265.2530 0017460 219.0050 206.4410 14.80905132000004
Iridium SV2 SEP 641 x 621
1 90002U 98999B 98135.94486111 .00000600 +00000-0 60000-4 0 00004
2 90002 086.580 265.2550 0013920 194.3570 215.7060 14.79461050000005
IRIDIUM xx, 15 May 98, 21:28:30 UT 641 x 626
1 98765U 980xxA 98136.07113438 .00000026 00000-0 00000+0 0 17
2 98765 86.5808 257.4270 0011126 223.7504 136.2836 14.78706595 26
Iridium SV1 SEP 644 x 639
1 90001U 98999A 98135.93791667 .00000600 +00000-0 60000-4 0 00007
2 90001 086.583 265.2570 0003410 119.1820 253.8990 14.76260425000001
in decreasing MM order, heights/checksums by Orbitel.exe, Ron's
initial elset included.
There will be five dense flare tracks over the Baltic Sea around 00:20 UT,
if they launch on time, and the satellites orient themselves quickly.
I will be travelling tonight, but I will be too far east when flares hit!
Still, I'll try to see them.
SeeSat Hypermail appears to be silent at the moment - could someone (Ron?)
mail elsets to my b_gimle@usa.net address, so I have a chance to search
from Helsinki Sunday morning also?
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