|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
Home Planet satellite inaccuracies
I have been using Home Planet
(http://fourmilab.ch/homeplanet/homeplanet.html) for a few days, and have noticed some inaccuracies with the satellite tracking. For example, the position of ISS (ZARYA). Orbital tracking (http://spaceflight.nasa.gov/realdata...ing/index.html) returns this data: 37.6 S 38.9 E Alt. 379.24 km Home Planet's default SATELITE.SAT returns this data (rounded): 9.4 N 51.4 E Alt. 288.89 km And the current NORAD two-line element set from Celestrak (http://celestrak.com/NORAD/elements/stations.txt) returns this data (rounded): 25.7 S 31.4 E Alt. 378.60 km Also note the conflicting positions of TERRA (http://terra.nasa.gov/) From SATELITE.SAT: 11.27 S 80.71 E Alt. 655.57 km From Celestrak (http://celestrak.com/NORAD/elements/resource.txt): 64.33 S 33.94 E Alt. 702.95 km Now, my questions: Why don't both the SATELITE.SAT and Celestrak data approximate the actual position of the ISS? How can I fix it so they do? Which data sets are more trustworthy/accurate: the default SATELITE.SAT or the sets from Celestrak? Is there a more accurate source for two-line element sets? Thanks in advance, Zachary Antolak |
#2
|
|||
|
|||
Home Planet satellite inaccuracies
|
#3
|
|||
|
|||
Home Planet satellite inaccuracies
Zachary Antolak wrote:
I have been using Home Planet (http://fourmilab.ch/homeplanet/homeplanet.html) for a few days, and have noticed some inaccuracies with the satellite tracking. For example, the position of ISS (ZARYA). [snip] Now, my questions: Why don't both the SATELITE.SAT and Celestrak data approximate the actual position of the ISS? How can I fix it so they do? Which data sets are more trustworthy/accurate: the default SATELITE.SAT or the sets from Celestrak? Is there a more accurate source for two-line element sets? How recent are the TLEs that you are using? ISS undergoes frequently orbital maneuvers, e.g. its height etc. Always use the very latest TLEs with ISS and other LEO stats. -- Larry Brash |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Sedna, space probes?, colonies? what's next? | TKalbfus | Policy | 265 | July 13th 04 12:00 AM |
Hans Moravec's Original Rotovator Paper | James Bowery | Policy | 0 | July 6th 04 07:45 AM |
if we had to leave this planet and colonize elsewhere... | meat n potatoes | Policy | 82 | April 26th 04 07:52 PM |
if we had to leave this planet and colonize elsewhere... | meat n potatoes | Policy | 45 | April 10th 04 07:51 PM |
Astronomers Find Jupiter-Like Planet 90 Light Years Away | Ron Baalke | Astronomy Misc | 2 | July 5th 03 04:19 AM |