We estimated the orbit of the Communication, Ocean and Meteorological Satellite (COMS), a Geostationary Earth Orbit (GEO) satellite, through data from actual optical observations using telescopes at the Sobaeksan Optical Astronomy Observatory (SOAO) of the Korea Astronomy and Space Science Institute (KASI), Optical Wide field Patrol (OWL) at KASI, and the Chungbuk National University Observatory (CNUO) from August 1, 2014, to January 13, 2015. The astrometric data of the satellite were extracted from the World Coordinate System (WCS) in the obtained images, and geometrically distorted errors were corrected. To handle the optically observed data, corrections were made for the observation time, light-travel time delay, shutter speed delay, and aberration. For final product, the sequential filter within the Orbit Determination Tool Kit (ODTK) was used for orbit estimation based on the results of optical observation. In addition, a comparative analysis was conducted between the precise orbit from the ephemeris of the COMS maintained by the satellite operator and the results of orbit estimation using optical observation. The orbits estimated in simulation agree with those estimated with actual optical observation data. The error in the results using optical observation data decreased with increasing number of observatories. Our results are useful for optimizing observation data for orbit estimation.

1. INTRODUCTION
 2. OPTICAL OBSERVATION OF ARTIFICIAL SATELLITE
  2.1 Optical Observatory
  2.2 Optical Observation Data
 3. PROCESSING OF OPTICAL OBSERVATION DATA
 4. COMPARISON OF ORBIT ESTIMATION RESULTS
  4.1 Comparison of Estimated Orbits with OpticalObservation Data and Simulated Observation Data
  4.2 Comparison of Orbit Estimated with Optical Observationand Satellite Ephemeris Maintained by Operator
 5. DISCUSSION AND SUMMARY
 ACKNOWLEDGEMENTS
 REFERENCES

• Ju Young Son(Korea University of Science and Technology,Korea Astronomy and Space Science Institute,Korea Air Force)
• Jung Hyun Jo(Korea University of Science and Technology,Korea Astronomy and Space Science Institute) Corresponding Author
• Jin Choi(Korea University of Science and Technology,Korea Astronomy and Space Science Institute)
• Bang-Yeop Kim(Korea Aerospace Research Institute)
• Joh-Na Yoon(Chungbuk National University Observatory)
• Hong-Suh Yim(Korea Astronomy and Space Science Institute)
• Young-Jun Choi(Korea Astronomy and Space Science Institute)
• Sun-Youp Park(Korea Astronomy and Space Science Institute)
• Young Ho Bae(Korea Astronomy and Space Science Institute)
• Young Ho Bae(Korea Astronomy and Space Science Institute)
• Dong-Goo Roh(Korea Astronomy and Space Science Institute)
• Jang-Hyun Park(Korea Astronomy and Space Science Institute)
• Ji-Hye Kim(Korea Astronomy and Space Science Institute)