In this study, we present the results of orbit determination (OD) using satellite laser ranging (SLR) data for the Science and Technology Satellite (STSAT)-2C by a short-arc analysis. For SLR data processing, the NASA/GSFC GEODYN II software with one year (2013/04 – 2014/04) of normal point observations is used. As there is only an extremely small quantity of SLR observations of STSAT-2C and they are sparsely distribution, the selection of the arc length and the estimation intervals for the atmospheric drag coefficients and the empirical acceleration parameters was made on an arc-to-arc basis. For orbit quality assessment, the post-fit residuals of each short-arc and orbit overlaps of arcs are investigated. The OD results show that the weighted root mean square post-fit residuals of short-arcs are less than 1 cm, and the average 1-day orbit overlaps are superior to 50/600/900 m for the radial/cross-track/along-track components. These results demonstrate that OD for STSAT-2C was successfully achieved with cm-level range precision. However its orbit quality did not reach the same level due to the availability of few and sparse measurement conditions. From a mission analysis viewpoint, obtaining the results of OD for STSAT-2C is significant for generating enhanced orbit predictions for more frequent tracking.

1. INTRODUCTION
 2. ORBIT DETERMINATION USING SLR DATA
 3. RESULTS
  3.1 Post-fit Rsiduals
  3.2 Orbit Overlaps
 4. CONCLUSIONS
 ACKNOWLEDGEMENTS
 REFERENCES

• Young-Rok Kim(Korea Astronomy and Space Science Institute) Corresponding Author
• Eunseo Park(Space Environment Research Centre, Mount Stromlo Observatory)
• Daniel Kucharski(Space Environment Research Centre, Mount Stromlo Observatory)
• Hyung-Chul Lim(Korea Astronomy and Space Science Institute)