LETSGO: A spacecraft-based mission to accurately measure the solar angular momentum with frame-dragging
Lorenzo Iorio

TL;DR
LETSGO is a proposed space mission designed to precisely measure the Sun's gravitational properties, including frame-dragging effects, by using a highly eccentric orbit and advanced data analysis techniques.
Contribution
The paper introduces a novel mission concept to detect solar frame-dragging and gravitational effects with high precision using a spacecraft in a unique orbit.
Findings
Potential to detect Lense-Thirring effect at 10^-3-10^-4 level
Ability to measure Schwarzschild component with 10^-8-10^-9 accuracy
Method to separate systematic errors from dynamical features
Abstract
LETSGO (LEnse-Thirring Sun-Geo Orbiter) is a proposed space-based mission involving the use of a spacecraft moving along a highly eccentric heliocentric orbit perpendicular to the ecliptic. It aims to accurately measure some important physical properties of the Sun and to test some post-Newtonian features of its gravitational field by continuously monitoring the Earth-probe range. Preliminary sensitivity analyses show that, by assuming a cm-level accuracy in ranging to the spacecraft, it would be possible to detect, in principle, the Lense-Thirring effect on it at a 10^-3-10^-4 level over a timescale of 2 yr, while the larger Schwarzschild component of the solar gravitational field may be sensed with a relative accuracy of about 10^-8-10^-9 during the same temporal interval. The competing range perturbation due to the non-sphericity of the Sun would be a source of systematic error, but…
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