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

Orbit Determination Using SLR Data for STSAT-2C: Short-arc Analysis