Apparent close approaches between near-Earth asteroids and quasars Precise astrometry and frame linking

作者：Nedelcu D A^*; Birlan M; Souchay J; Assafin M; Andrei A H; Badescu O; Popescu P; Paraschiv P

来源：Astronomy & Astrophysics, 2010, 509: A27.

DOI：10.1051/0004-6361/200913172

• methods: statistical
• astrometry
• reference systems
• ephemerides
• minor planets, asteroids: general

Aims. We investigate the link between the International Celestial Reference Frame (ICRF) and the dynamical reference frame realized by the ephemerides of the Solar System bodies.
Methods. We propose a procedure that implies a selection of events for asteroids with accurately determined orbits crossing the CCD field containing selected quasars. Using a Bulirsch-Stoer numerical integrator, we constructed 8-years (2010-2018) ephemerides for a set of 836 numbered near-Earth asteroids (NEAs). We searched for close encounters (within a typical field of view of groundbased telescopes) between our selected set of asteroids and quasars with high-accuracy astrometric positions extracted from the Large Quasars Astrometric Catalog (LQAC).
Results. In the designated period (2010-2018), we found a number of 2924, 14 257, and 6972 close approaches (within 10') between asteroids with a minimum solar elongation value of 60 degrees and quasars from the ICRF-Ext2, the Very Large Baseline Array Calibrator Survey (VLBA-CS), and the Very Large Array (VLA), respectively. This large number of close encounters provides the observational basis needed to investigate the link between the dynamical reference frame and the ICRF.

• 出版日期2010-1