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Expected Precision of Europa Clipper Gravity Measurements
Ashok K. Verma, Jean-Luc Margot
The primary gravity science objective of NASA's Clipper mission to Europa is to confirm the presence or absence of a global subsurface ocean beneath Europa's Icy crust. Gravity fie…
Prospects of dynamical determination of General Relativity parameter beta and solar quadrupole moment J2 with asteroid radar astronomy
Ashok K. Verma, Jean-Luc Margot, Adam H. Greenberg
We evaluated the prospects of quantifying the parameterized post-Newtonian parameter beta and solar quadrupole moment J2 with observations of near-Earth asteroids with large orbita…
Yarkovsky Drift Detections for 247 Near-Earth Asteroids
Adam H. Greenberg, Jean-Luc Margot, Ashok K. Verma +2
The Yarkovsky effect is a thermal process acting upon the orbits of small celestial bodies, which can cause these orbits to slowly expand or contract with time. The effect is subtl…
Asteroid 1566 Icarus's size, shape, orbit, and Yarkovsky drift from radar observations
Adam H. Greenberg, Jean-Luc Margot, Ashok K. Verma +4
Near-Earth asteroid (NEA) 1566 Icarus ( au, , ) made a close approach to Earth in June 2015 at 22 lunar distances (LD). Its detection during the 196…
Improvement of the planetary ephemerides using spacecraft navigation data and its application to fundamental physics
Ashok Verma
The planetary ephemerides play a crucial role for spacecraft navigation, mission planning, reduction and analysis of the most precise astronomical observations. The construction of…
Use of MESSENGER radioscience data to improve planetary ephemeris and to test general relativity
Ashok Verma, Agnes Fienga, Jacques Laskar +2
The current knowledge of Mercury orbit has mainly been gained by direct radar ranging obtained from the 60s to 1998 and by five Mercury flybys made by Mariner 10 in the 70s, and ME…