Loading...
Please wait, while we are loading the content...
Similar Documents
Dynamical reference frame: current relevance and future prospects
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Standish Jr., E. M.Jr.,, Jr |
| Copyright Year | 2000 |
| Description | Planetary and lunar ephemerides are no longer used for the determination of inertial space. Instead, the new fundamental reference frame, the International Celestial Reference Frame (ICRF), is inherently less susceptible to extraneous, non-inertial rotations than a dynamical reference frame determined by the ephemerides would be. Consequently, the ephemerides are now adjusted onto the ICRF, and they are fit to two modern, accurate observational data types: ranging (radar, lunar laser, spacecraft) and Very Long Baseline Interferometry (VLBI) (of spacecraft near planets). The uncertainties remaining in the inner planet ephemerides are on the order of 1 kilometer, both in relative positions between the bodies and in the orientation of the inner system as a whole. The predictive capabilities of the inner planet ephemerides are limited by the uncertainties in the masses of many asteroids. For this reason, future improvements to the ephemerides must await determinations of many asteroid masses. Until then, it will be necessary to constantly update the ephemerides with a continuous supply of observational data. |
| File Size | 107449 |
| File Format | |
| Language | English |
| Publisher Date | 2000-03-01 |
| Access Restriction | Open |
| Subject Keyword | Vlbi (very Long Baseline Interferometry) Spacecraft Ranging Inner Planets Inertial Space International Celestial Reference System Lunar Laser Ranging Icrs (international Celestial Reference System) Radar Ranging Inertial Coordinates Very Long Base Interferometry Celestial Reference Systems Space Observations From Earth Planet Ephemerides Rangefinding Interferometry Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
