Loading...
Please wait, while we are loading the content...
Similar Documents
The gravity field of mars from mgs, mars odyssey, and mro radio science
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Goossens, Sander Lemoine, Frank G. Genova, Antonio Zuber, Maria T. Mazarico, Erwan Smith, David E. |
| Copyright Year | 2015 |
| Description | The Mars Global Surveyor (MGS), Mars Odyssey (ODY), and Mars Reconnaissance Orbiter (MRO) missions have enabled NASA to conduct reconnaissance and exploration of Mars from orbit for sixteen consecutive years. These radio systems on these spacecraft enabled radio science in orbit around Mars to improve the knowledge of the static structure of the Martian gravitational field. The continuity of the radio tracking data, which cover more than a solar cycle, also provides useful information to characterize the temporal variability of the gravity field, relevant to the planet's internal dynamics and the structure and dynamics of the atmosphere [1]. MGS operated for more than 7 years, between 1999 and 2006, in a frozen sun-synchronous, near-circular, polar orbit with the periapsis at approximately 370 km altitude. ODY and MRO have been orbiting Mars in two separate sun-synchronous orbits at different local times and altitudes. ODY began its mapping phase in 2002 with the periapis at approximately 390 km altitude and 4-5pm Local Solar Time (LST), whereas the MRO science mission started in November 2006 with the periapis at approximately 255 km altitude and 3pm LST. The 16 years of radio tracking data provide useful information on the atmospheric density in the Martian upper atmosphere. We used ODY and MRO radio data to recover the long-term periodicity of the major atmospheric constituents -- CO2, O, and He -- at the orbit altitudes of these two spacecraft [2]. The improved atmospheric model provides a better prediction of the annual and semi-annual variability of the dominant species. Therefore, the inclusion of the recovered model leads to improved orbit determination and an improved gravity field model of Mars with MGS, ODY, and MRO radio tracking data. |
| File Size | 696971 |
| Page Count | 2 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20160008404 |
| Archival Resource Key | ark:/13960/t01z96n43 |
| Language | English |
| Publisher Date | 2015-03-16 |
| Access Restriction | Open |
| Subject Keyword | Mars Mgs Mro Atmospheric Models Variability Mars Planet Gravitational Fields Exploration Nasa Space Programs Periodic Variations Mars Exploration 2001 Mars Odyssey Mars Reconnaissance Orbiter Orbit Determination Upper Atmosphere Atmospheric Density Radio Tracking Altitude Mars Global Surveyor Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
