Volume 647, March 2021
|Number of page(s)||6|
|Section||Celestial mechanics and astrometry|
|Published online||24 March 2021|
Estimates of the change rate of solar mass and gravitational constant based on the dynamics of the Solar System
Institute of Applied Astronomy of Russian Academy of Sciences (IAA RAS),
Kutuzov Quay 10,
2 St.Petersburg State University, Universitetski pr. 28, 198504 Petrodvoretz, Russia
3 St. Petersburg Electrotechnical University, ul. Professora Popova 5, 197376 St. Petersburg, Russia
Accepted: 3 February 2021
The estimate of the change rate of the solar gravitational parameter d(GM⊙)∕dt is obtained from processing modern positional observations of planets and spacecraft. Observations were processed and parameters were determined basing on the numerical planetary ephemeris EPM2019. The obtained annual decrease in solar mass M⊙ accounts for the loss through radiation Ṁ⊙rad, through the outgoing solar wind Ṁ⊙wind, and for the material falling on the Sun Ṁ⊙fall. The estimated relative value is within −13.4×10−14 < (Ṁ⊙/Ṁ⊙)rad+wind+fall < −8.7×10−14 per year. The following range for the change rate of the gravitational constant G was obtained: −2.9 × 10−14 < Ġ∕G < + 4.6 × 10−14 per year (3σ). The new result reduces the interval for the change in G and narrows the limits of possible deviations for alternative gravitational theories from general relativity.
Key words: methods: numerical / celestial mechanics / techniques: radar astronomy / Sun: fundamental parameters / planets and satellites: fundamental parameters / solar wind
© ESO 2021
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