Engineering topics
Jacobs, Christopher S.
Publications and source records attributed to Jacobs, Christopher S..
ICRF3, the new realization of the International Celestial Reference Frame
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High accuracy ground-based near-Earth-asteroid astrometry using synthetic tracking
UNKNOWN
The X/Ka Celestial Reference Frame: Assessing Accuracy - Can It Be More Accurate than the ICRF2?
No abstract available
Astrometry of Cassini with the VLBA to improve the Saturn ephemeris
Planetary ephemerides have been developed and improved over centuries. They are a fundamental tool for understanding solar system dynamics, and essential for planetary and small body mass determinations, occultation predictions, high-precision tests of general relativity, pulsar timing, and interplanetary spacecraft navigation. This paper presents recent results from a continuing program of high-precision astrometric very long baseline interferometry (VLBI) observations of the Cassini spacecraft orbiting Saturn, using the Very Long Baseline Array (VLBA). We have previously shown that VLBA measurements can be combined with spacecraft orbit determinations from Doppler and range tracking and VLBI links to the inertial extragalactic reference frame to provide the most accurate barycentric positions currently available for Saturn. Here we report an additional five years of VLBA observations along with improved phase reference source positions, resulting in an improvement in residuals with respect to the Jet Propulsion Laboratory's dynamical ephemeris.
The Celestial Reference Frame at X/Ka-Band Status & Prospects for Improving the South
No abstract available