Skip to Main content Skip to Navigation
Journal articles

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

Abstract : 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◦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.
Complete list of metadatas

Cited literature [19 references]  Display  Hide  Download

https://hal.sorbonne-universite.fr/hal-00616498
Contributor : Mirel Birlan <>
Submitted on : Monday, August 22, 2011 - 5:09:29 PM
Last modification on : Wednesday, September 23, 2020 - 4:39:28 AM
Long-term archiving on: : Monday, November 12, 2012 - 3:46:24 PM

File

Apparent_close_approaches_betw...
Publisher files allowed on an open archive

Identifiers

Citation

Dan Alin Nedelcu, Mirel Birlan, Jean Souchay, M. Assafin, A. H. Andrei, et al.. Apparent close approaches between near-Earth asteroids and quasars. Precise astrometry and frame linking. Astronomy and Astrophysics - A&A, EDP Sciences, 2010, 509 (A27), 8 p. ⟨10.1051/0004-6361/200913172⟩. ⟨hal-00616498⟩

Share

Metrics

Record views

579

Files downloads

467