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Re: Tracking STS is hard



Up-to-date keps for STS-101 are being provided as STSNEW.TXT from Dave
Ransom's site via the DoD C-Band Radar team...

Here is the last update:

STS-101 DOCK
1 26368U 00027A   00143.79514699  .00007202  21896-9  38510-4 0   147
2 26368  51.5843 268.1427 0005289 230.5775 348.0034 15.79593359   543

Launch time for STS-101: 19 MAY 00 @ 10:11:10.0752 UTC

Earth-Fixed Greenwich State Vector:

Vector format = 117
Satellite Name:         STS-101 DOCK
Catalog Number:         26368  00027A    
Epoch Date/Time:        00143.79514699100
                        05/22/2000  19:05:00.700 UTC
EFG E:                   11717510.0000000 ft
    F:                   -15209475.000000 ft
    G:                   -10769846.000000 ft
    Edot:                7867.22999999999 ft/s
    Fdot:                17014.3199999999 ft/s
    Gdot:                -15483.069999999 ft/s
ndot/2 (drag):              0.00007202446 rev/day^2
nddt/6:                       2.18965E-10 rev/day^3
Bstar:                        3.85096E-05 1/Earth Radii
Elset #:                               14
Rev @ Epoch:               54.60722988932

Keplerian Elements (Amsat format):

Satellite: STS-101 DOCK
Catalog number: 26368
Epoch time:      00143.79514699
Element set:      14
Inclination:       51.5843 deg
RA of node:       268.1427 deg
Eccentricity:    0.0005289
Arg of perigee:   230.5775 deg
Mean anomaly:     348.0034 deg
Mean motion:   15.79593359 rev/day
Decay rate:    7.20245e-05 rev/day^2
Epoch rev:              54
Checksum:              315


SPACE SHUTTLE ORBITAL DATA:

These 2-line elements have been generated using Ken Ernandes' program
VEC2TLE using real time state vector data supplied by DOD C-Band Radar
Network courtesy Dave Simonson. Note that the epoch of the 2-line
elements is the same as the state vector time.

Drag and B-Star parameters are internally calculated by VEC2TLE using
a drag factor of 0.5. Rev numbers use NASA orbit numbering convention.

                                   Dave Ransom
                                   http://www.dransom.com
                                   http://tie.jpl.nasa.gov/dransom/


Miles Mann wrote:
> 
> Hi All:
> 
> It is very difficult to track a NASA shuttle.
> The reason is because they are constantly firing
> their engines and other maneuvers.
> The kep data you have assumes there are NO engine
> maneuvers at all.
> 
> If you have week old keps for ISS, then you may only
> have a tracking error of less than 1 minute.
> 
> If you have 1 day old keps for the Shuttle, then
> you may be off by hours.
> 
> Docking Missions:
> When the shuttle is docking with an object such as ISS
> or Hubbell, then you should track the docking object and
> not the shuttle.  The ISS is in a stable orbit 229 Statute Miles up.
> The shuttle, 2 hours after launch is only 100 miles up.  On just about
> every orbit the shuttle fires its engine for a little boots (until
> docking).
> 
> It takes 2 days for the shuttle to climb from 100 miles to 223 miles.
> So on a ISS mission your keps for the shuttle will be junk if they
> are more than a few hours old (until the docking).
> After the docking the keps usually will not change much.
> Unless the use the shuttle to Boost the ISS to a new orbit.
> 
> Keps:
> For the shuttle, get the keps from the NASA web directly or
> off the HF rebroadcast (wa3nan??).  Most other web pages for the Shuttle
> keps
> will be out of date by the time they are posted.  Or just track ISS.
> 
> The reverse is true when the shuttle Undocks.  it takes 2 days to
> de-orbit
> and thus 2 hour old shuttle keps may be useless.
> 
> Miles WF1F MAREX-NA
> 
> David Bate wrote:
> >
> > You may be using the latest from USSPACECOMM which looks like they are
> > still off.  I would suggest using STS Update version 0020 and use the
> > F11 function and have the latest DOD c-band vectors added via Dave
> > Ransom's site.
> >
> > I tested the latest TLE's from USSPACECOMM and the STS numbers are off.
> > As soon as I updated with STSNEW.TXT it was right on the money with MCC.
> >
> > John Becker wrote:
> > >
> > > Whats wrong? ? ? ?
> > >
> > > right now STSPLUS shows STS-101 over my QTH (Missouri) and
> > > the ISS S-E of Rio de Janeiro?
> > >
> > > I have the last KEMPS posted for STS-101.
> > >
> > > ----
> > > Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> > > To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
> >
> > --
> > David Bate (davebate@home.com)
> > Canadian Space Support Site and
> > Communications Group - CS3CG
> > Bowmanville, Ontario, Canada
> > ICQ 9344489 - NYSING 191
> >
> > Network Analyst (dbate@rci.rogers.com)
> > Rogers Communications Inc.
> >
> > http://members.home.net/davebate
> > http://welcome.to/CS3CG or http://CS3CG.welcome.to
> > ----
> > Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> > To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org

-- 
David Bate (davebate@home.com)
Canadian Space Support Site and
Communications Group - CS3CG
Bowmanville, Ontario, Canada
ICQ 9344489 - NYSING 191

Network Analyst (dbate@rci.rogers.com)
Rogers Communications Inc.

http://members.home.net/davebate
http://welcome.to/CS3CG or http://CS3CG.welcome.to
----
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