Reference frames in astrometry
نویسندگان
چکیده
منابع مشابه
Relativistic Reference Frames for Astrometry and Navigation in the Solar System
Astrophysical space missions deliver invaluable information about our universe, stellar dynamics of our galaxy, and motion of celestial bodies in the solar system. Astrometric space missions SIM and Gaia will determine distances to stars and cosmological objects as well as their physical characteristics and positions on the celestial sphere with microarcsecond precision. These and other space m...
متن کاملFrom Reference Frames to Relativistic Experiments: Absolute and Relative Radio Astrometry
Reference systems and frames are crucial for high precision absolute astrometric work, and their foundations must be well-defined. The current frame, the International Celestial Reference Frame, will be discussed: its history, the use of the group delay as the measured quantity, the positional accuracy of 0.3 mas, and possible future improvements. On the other hand, for the determination of the...
متن کاملSpace - VLBI phase - reference mapping and astrometry
We present 5 GHz space-VLBI observations of the quasar pair B 1342+662 / B 1342+663 that demonstrate the feasibility of phase-reference techniques using an antenna in space. The space-based data were taken by the satellite HALCA, of the space-VLBI mission VSOP. From residual (referenced) phases we derive an upper bound of 10 meters to the uncertainty of the spacecraft orbit reconstruction. An a...
متن کاملFrames of Reference
A n amazing thing happened recently: A nonengineering person publicly praised what our profession has accomplished. Marilyn vos Savant writes a weekly column for Parade magazine, part of the Sunday newspaper for many people in the US. Vos Savant reportedly has the highest IQ ever recorded. Even if you believe that IQs don't mean much, vos Savant corroborated her brilliance when she stated in he...
متن کاملInner space: Reference frames
How are we aware of our surroundings? Somehow, from a pair of tiny, two-dimensional pictures of the visual world – provided by our retinas – our brains are able to render the world as it is, accurately depicting the locations of both a distant mountain range and the camera we are pointing at it. To understand how space is represented in the brain, neurophysiologists have borrowed the useful con...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1988
ISSN: 0074-1809
DOI: 10.1017/s0074180900119217