Observations made 20 Oct 2002 #2
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CoSaTrak 1, 85mm f/1.6 lens with 0.003 lux CCD surveillance camera.
Conditions - poor - full moon
Cospar Site #0433 Long 18.5129 E, Lat 33.9406 S, altitude 10 metres
21799 91 076C 0433 P 20021020174434700 17 15 2338490+231830 39 S
21809 91 076E 0433 P 20021020174513600 17 15 2346420+200657 39 S
21808 91 076D 0433 P 20021020174615900 17 15 0014370+120738 39 S
26906 01 040B 0433 P 20021020175541300 17 15 1901480-674219 39 S+043 05
26906 01 040B 0433 P 20021020175728200 17 15 2136140-425332 39 S+025 05
26906 01 040B 0433 P 20021020175922400 17 15 2240080-092134 39 S+035 05
25157 98 007A 0433 P 20021020181812400 17 15 1854480-873620 39 S+075 05
25157 98 007A 0433 P 20021020181852800 17 15 1853430-745730 39 S+065 05
25157 98 007A 0433 P 20021020181925600 17 15 1851290-620341 39 S+063 05
25157 98 007A 0433 P 20021020182031200 17 15 1846350-315429 39 S+063 05
23233 94 057A 0433 P 20021020182905300 17 15 1730250-563431 39 S+075 05
23233 94 057A 0433 P 20021020183006100 17 15 1811410-350131 39 S+072 05
23233 94 057A 0433 P 20021020183048900 17 15 1827000-190923 39 S+072 05
21798 91 082A 0433 P 20021020184024800 17 15 2057210-764947 39 R+071 05
21798 91 082A 0433 P 20021020184109300 17 15 2039560-605022 39 R+064 05
26905 01 040A 0433 P 20021020184435700 17 15 1636090-512546 39 S
26907 01 040C 0433 P 20021020184435700 17 15 1642170-504826 39 S
26905 01 040A 0433 P 20021020185105900 17 15 2206270+172305 39 S+050 05
26907 01 040C 0433 P 20021020185105900 17 15 2206470+183417 39 S+055 05
Notes:
(1) Yesterday I made the statement that GUIDE 8 gave an incorrect
prediction for an object called 99 750A whilst that from HIGHFLY
was pretty close.
In correspondence with Mike McCants and Bill Gray the problem is not
that simple. BOTH programs are correct - it depends on the data used
from the orbital elements.
Mikes program HIGHFLY uses the drag term, whilst Bill Gray in GUIDE 8
uses the BSTAR term as used in the SGP4 model. It so happened that
in this case BSTAR was zero. If the drag term for the satellite is
set to zero then GUIDE8 and HIGHFLY agree.
The fact that I saw 99 750A and that it matched HIGHFLY's prediction
pretty well was, according to Mike, "pure luck". Actually I did a
40 minute orbit plane scan for the satellite and it was just lucky
that as I ended the scan with no satellite seen, the satellite crept
into the field of view running 22 minutes late on my predictions
which were based on GUIDE's prediction.
(2) This concludes all the positional observations for classified
satellites observed on the 20th October. I have still to identify
the dozen or so "unknown" satellites seen whilst tracking the
classified objects . This I hope to do tomorrow.
Cheers
Greg
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This archive was generated by hypermail 2b29 : Tue Oct 22 2002 - 13:22:54 EDT