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## Parameters of EPM 2021a Lunar Ephemeris

Transactions of IAA RAS, issue 56, 32–38 (2021)

Keywords: lunar ephemeris, lunar laser ranging observations, observation normal points, lunar orbital-rotational model of motion

### Abstract

For more than 50 years, Lunar laser ranging has served as the main high-precision tool for improving the ephemeris of the Moon. In this paper the results of LLR observations processing are considered and reviewed in order to obtain and refine the parameters of the ephemeris of the Moon EPM2021a which is created and maintained at the Institute of Applied Astronomy (IAA RAS). Until 2014, the Russian ephemeris of the Moon was based on the model of the Moon orbital and rotational motion proposed by G. A. Krasinsky and implemented within the ERA-7 system. After, a new version of the ephemeris EPM (including the ephemeris of the Moon) began to develop within the renovated ERA-8 system created by D. A. Pavlov. The latest version of the ephemeris EPM2021a is based on the model of the Moon orbital and rotational motion similar to that used in DE430 (NASA JPL) ephemeris. In this work 30355 LLR normal points have been used to adjust the lunar ephemeris parameters. This number also includes 1344 ones added for the first time. It is worth noting that 1210 of them were obtained at the Apache station between 2017 and 2020: one could see that nothing had been posted at their site since 2016. The following results has been achieved: 1) the parameters of the lunar ephemeris and their deviations have been determined; 2) these parameters have been studied and compared with that of the French ephemeris INPOP2019a [1].

### Citation

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M. O. Kan, E. I. Yagudina. Parameters of EPM 2021a Lunar Ephemeris // Transactions of IAA RAS. — 2021. — Issue 56. — P. 32–38. @article{kan2021, abstract = {For more than 50 years, Lunar laser ranging has served as the main high-precision tool for improving the ephemeris of the Moon. In this paper the results of LLR observations processing are considered and reviewed in order to obtain and refine the parameters of the ephemeris of the Moon EPM2021a which is created and maintained at the Institute of Applied Astronomy (IAA RAS). Until 2014, the Russian ephemeris of the Moon was based on the model of the Moon orbital and rotational motion proposed by G. A. Krasinsky and implemented within the ERA-7 system. After, a new version of the ephemeris EPM (including the ephemeris of the Moon) began to develop within the renovated ERA-8 system created by D. A. Pavlov. The latest version of the ephemeris EPM2021a is based on the model of the Moon orbital and rotational motion similar to that used in DE430 (NASA JPL) ephemeris. In this work 30355 LLR normal points have been used to adjust the lunar ephemeris parameters. This number also includes 1344 ones added for the first time. It is worth noting that 1210 of them were obtained at the Apache station between 2017 and 2020: one could see that nothing had been posted at their site since 2016. The following results has been achieved: 1) the parameters of the lunar ephemeris and their deviations have been determined; 2) these parameters have been studied and compared with that of the French ephemeris INPOP2019a [1].}, author = {M.~O. Kan and E.~I. Yagudina}, doi = {10.32876/ApplAstron.56.32-38}, issue = {56}, journal = {Transactions of IAA RAS}, keyword = {lunar ephemeris, lunar laser ranging observations, observation normal points, lunar orbital-rotational model of motion}, pages = {32--38}, title = {Parameters of EPM 2021a Lunar Ephemeris}, url = {http://iaaras.ru/en/library/paper/2081/}, year = {2021} } TY - JOUR TI - Parameters of EPM 2021a Lunar Ephemeris AU - Kan, M. O. AU - Yagudina, E. I. PY - 2021 T2 - Transactions of IAA RAS IS - 56 SP - 32 AB - For more than 50 years, Lunar laser ranging has served as the main high-precision tool for improving the ephemeris of the Moon. In this paper the results of LLR observations processing are considered and reviewed in order to obtain and refine the parameters of the ephemeris of the Moon EPM2021a which is created and maintained at the Institute of Applied Astronomy (IAA RAS). Until 2014, the Russian ephemeris of the Moon was based on the model of the Moon orbital and rotational motion proposed by G. A. Krasinsky and implemented within the ERA-7 system. After, a new version of the ephemeris EPM (including the ephemeris of the Moon) began to develop within the renovated ERA-8 system created by D. A. Pavlov. The latest version of the ephemeris EPM2021a is based on the model of the Moon orbital and rotational motion similar to that used in DE430 (NASA JPL) ephemeris. In this work 30355 LLR normal points have been used to adjust the lunar ephemeris parameters. This number also includes 1344 ones added for the first time. It is worth noting that 1210 of them were obtained at the Apache station between 2017 and 2020: one could see that nothing had been posted at their site since 2016. The following results has been achieved: 1) the parameters of the lunar ephemeris and their deviations have been determined; 2) these parameters have been studied and compared with that of the French ephemeris INPOP2019a [1]. DO - 10.32876/ApplAstron.56.32-38 UR - http://iaaras.ru/en/library/paper/2081/ ER -