Determination of Venus’ Interior Structure with EnVision
- Research areas:
- Year:
- 2021
- Authors:
-
- Pascal Rosenblatt
- Caroline Dumoulin
- Jean-Charles Marty
- Antonio Genova
- Journal:
- Remote Sensing
- Volume:
- 13
- Number:
- 9
- ISSN:
- 2072-4292
- Abstract:
- The Venusian geological features are poorly gravity-resolved, and the state of the core is not well constrained, preventing an understanding of Venus’ cooling history. The EnVision candidate mission to the ESA’s Cosmic Vision Programme consists of a low-altitude orbiter to investigate geological and atmospheric processes. The gravity experiment aboard this mission aims to determine Venus’ geophysical parameters to fully characterize its internal structure. By analyzing the radio-tracking data that will be acquired through daily operations over six Venusian days (four Earth’s years), we will derive a highly accurate gravity field (spatial resolution better than ~170 km), allowing detection of lateral variations of the lithosphere and crust properties beneath most of the geological features. The expected 0.3% error on the Love number k2, 0.1° error on the tidal phase lag and 1.4% error on the moment of inertia are fundamental to constrain the core size and state as well as the mantle viscosity.
