This technical paper deals the practical transformation algorithms between several lunar reference frames which will be used for Korea pathfinder lunar orbiter (KPLO) flight operation. Despite of various lunar reference frame definitions already exist, use of a common transformation algorithm while establishing lunar reference frame is very important for all members related to KPLO mission. This is because use of slight different parameters during frame transformation may result significant misleading while reprocessing data based on KPLO flight dynamics. Therefore, details of practical transformation algorithms for the KPLO mission specific lunar reference frames is presented with step by step implementation procedures. Examples of transformation results are also presented to support KPLO flight dynamics data user community which is expected to give practical guidelines while post processing the data as their needs. With this technical paper, common understandings of reference frames that will be used throughout not only the KPLO flight operation but also science data reprocessing can be established. It is expected to eliminate, or at least minimize, unnecessary confusion among all of the KPLO mission members including: Korea Aerospace Research Institute (KARI), National Aeronautics and Space Administration (NASA) as well as other organizations participating in KPLO payload development and operation, or further lunar science community world-wide who are interested in KPLO science data post processing.

1. INTRODUCTION
2. Lunar reference frames andtransformation details
    2.1 Moon Inertial Frame
    2.2 Moon Principal Axis (PA) Frame
    2.3 Moon Mean Earth (ME) Frame
    2.4 Moon True of Date (TOD) frame
3. Transformation Examples
4. CONCLUSION
References

• Young-Joo Song(Lunar Exploration Program Office, Korea Aerospace Research Institute)
• Donghun Lee(School of Aerospace and Mechanical Engineering, Korea Aerospace University) Corresponding Author
• Young-Rok Kim(Lunar Exploration Program Office, Korea Aerospace Research Institute)
• Jonghee Bae(Lunar Exploration Program Office, Korea Aerospace Research Institute)
• Jae-ik Park(Lunar Exploration Program Office, Korea Aerospace Research Institute)
• SeungBum Hong(Lunar Exploration Program Office, Korea Aerospace Research Institute)
• Dae-Kwan Kim(Lunar Exploration Program Office, Korea Aerospace Research Institute)
• Sang-Ryool Lee(Director’s Office, Korea Aerospace Research Institute)