FS banner

Developing Standards

 

 Mass of Ceres

C.A3 recommends an update of Ceres based on Dawn results to Konopliv, A. S., et al., Icarus, 299, p. 411-429: "The Ceres gravity field, spin pole, rotation period and orbit from the Dawn radiometric tracking and optical data"

 

 Mass of Sun / Mercury

Possible update of the value of the mass of Sun / Mercury for the Current Best Estimates to 6023657.95 ± 0.33 from Konopliv, A.S., Park, R.S., & Ermakov, A.I. 2020, "The Mercury Gravity Field, Orientation, Love Number, and Ephemeris from the MESSENGER Radiometric Tracking Data," Icarus, 225, 113386. There is also a newer value from RISE expected soon.

 

 Mass of Sun / Mars

Possible update of the value of the mass of Sun / Mars for the Current Best Estimates to 3098703.547 ± 0.014 from Konopliv, A.S., Park, R.S. & Folkner, W.M. 2016, "An Improved JPL Mars Gravity Field and Orientation from Mars Orbiter and Lander Tracking Data," Icarus, 274, 253-260. There is also a newer value from RISE expected soon.

 

 Mass of Sun / Jupiter

Possible update of the value of the mass of Sun / Jupiter for the Current Best Estimates from the JUNO mission. Durante et al., 2020, Geophysical Research Letters, Volume 47, Issue 4, “Jupiter’s gravity Field Halfway Through the Juno Mission” (Table 2).

 

 Mass of Sun / Saturn

Possible update of the value of the mass of Sun / Saturn for the Current Best Estimates from Cassini. Iess, et al., 2019, SCIENCE 2019 Vol 364, Issue 6445 “Measurement and implications of Saturn’s gravity field and ring mass.”

 

 Cislunar (& beyond) Standards

Discussion of the international coordination for refrence frame and time standards as well as standard terms for the cislunar and lunar environment are necessary due to upcoming lunar missions and lunar-based scientific research.

 

 UT to UTC

Discussion of the results of the 2023 ITU meeting on the potential removal of leap seconds will be necessary.

 

Recently Updated Standards

 

 Mean Pole

The International Earth Rotation and Reference Systems Service (IERS) updated the term Mean Pole and Polar Motion to Secular Pole in 2018 to better reflect the situation. This plot of polar motion (from the IERS), shows mean pole displacement from 1900 to 2006.

 

 Time Scales

Consultative Committee for Time and Frequency (CCTF) and CIPM at the General Conference on Weights and Measures (CGPM) adopted Resolution 2 "On the definition of time scales" This recommendation removes the ambiguity between TT and International Atomic Time (TAI) by making the definition of TAI conform to the constant LG defining the rate of TT.

Last modified: 2022 July