Skip to Main content Skip to Navigation
Journal articles

Finding SEIS North on Mars: Comparisons Between SEIS Sundial, Inertial and Imaging Measurements and Consequences for Seismic Analysis

Abstract : In this paper, we present the results obtained in the determination of the true north direction on Mars by using a gnomon on the InSight mission and compare the measurements with either the North determination from the Inertial Measurement Unit and imaging analysis. The obtained measurement has been used to populate the SEIS orientation information in the archived SEIS data. Images taken during December 2018 and January 2019 allow to determine the gnomon shadow position and length over a target. By calculating the Sun local coordinates using planetary ephemeris VSOP87, the images are used to estimate the true North direction on the landing site. By using eight different images selected, we obtain the true North direction with an accuracy up to 2.5°, which is confirmed by the IMU and imaging analysis. The true North direction is also confirmed by an image taken near local noon, when the sun crosses the meridian. The North determination precision is then discussed in view of the seismic determination of the back azimuth.
Document type :
Journal articles
Complete list of metadata

https://hal.sorbonne-universite.fr/hal-03202025
Contributor : Gestionnaire Hal-Su <>
Submitted on : Monday, April 19, 2021 - 2:41:45 PM
Last modification on : Wednesday, April 21, 2021 - 3:35:31 AM

File

2020EA001286.pdf
Publication funded by an institution

Identifiers

Citation

D. Savoie, A. Richard, M. Goutaudier, P. Lognonné, K. Hurst, et al.. Finding SEIS North on Mars: Comparisons Between SEIS Sundial, Inertial and Imaging Measurements and Consequences for Seismic Analysis. Earth and Space Science, American Geophysical Union/Wiley, 2021, 8 (3), ⟨10.1029/2020ea001286⟩. ⟨hal-03202025⟩

Share

Metrics

Record views

25

Files downloads

22