Search Publications
Strong Spatial Aggregation of Martian Surface Temperature Shaped by Spatial and Seasonal Variations in Meteorological and Environmental Factors
Li, Fei; Barriot, Jean-Pierre; Luo, Yao-Wen +1 more
Spatio-temporal variation in the Martian surface temperature (MST) is an indicator of ground level thermal processes and hence a building block for climate models. However, the distribution of MST exhibits different levels of spatial aggregation or heterogeneity, and varies in space and time. Furthermore, the effect of regional differences in mete…
Resource potential and planning for exploration of the Hebrus Valles, Mars
Yadav, Santosh Kumar; Srivastava, Neeraj; Sharma, Ravi
Mars is the only extraterrestrial body which could host primitive lifeforms and also has the potential to host a human base in the near future. Towards fulfilling these objectives, several remote sensing missions and rover based missions have been sent to Mars. Still, confirmation of existing or extinct life on this planet in any form has not been…
A new method to determine the gravity field of small bodies from line-of-sight acceleration data
Barriot, Jean-Pierre; Rodriguez, J. Alexis P.; Yan, Jian-Guo +2 more
We present a new method to derive line-of-sight acceleration observables from spacecraft radio tracking data. The observables can be used to estimate the mass and gravity of a natural satellite as a spacecraft flyby. The corresponding observation model adapts to one-way and two/three-way tracking modes. As a test case for method validation and app…
Spacecraft Doppler tracking with possible violations of LLI and LPI: upper bounds from one-way measurements on MEX
Xie, Yi; Huang, Yong
We analyze the post-fit residuals of one-way Doppler tracking data from the Mars Express (MEX) spacecraft to test possible violations of local Lorentz invariance (LLI) and local position invariance (LPI). These one-way Doppler observations were carried out on 2011 August 7 for about 20 minutes at Sheshan Station of Shanghai Astronomical Observator…
Spacecraft Doppler tracking with possible violations of LLI and LPI: preliminary bounds on LLI from Mars Express
Xie, Yi; Huang, Yong; Zhang, Yu-Fei +2 more
Three-way spacecraft Doppler tracking is currently widely used and it plays an important role in the control and navigation of deep space missions. Using the theory of three-way Doppler tracking, including possible violations of the local Lorentz invariance (LLI) and the local position invariance (LPI), we analyze the post-fit residuals of three-w…
Mars geodesy, rotation and gravity
Dehant, Veronique; Rosenblatt, Pascal
This review provides explanations of how geodesy, rotation and gravity can be addressed using radioscience data of an orbiter around a planet or of the lander on its surface. The planet Mars is the center of the discussion. The information one can get from orbitography and radioscience in general concerns the global static gravitational field, the…
Geology of Mars after the first 40 years of exploration
van Gasselt, Stephan; Pio Rossi, Angelo
The knowledge of Martian geology has increased enormously in the last 40 yr. Several missions orbiting or roving Mars have revolutionized our understanding of its evolution and geological features, which in several ways are similar to Earth, but are extremely different in many respects. The impressive dichotomy between the two Martian hemispheres …