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

被引:8
作者
Nedelcu, D. A. [1 ,2 ]
Birlan, M. [1 ]
Souchay, J. [3 ]
Assafin, M. [4 ]
Andrei, A. H. [4 ,5 ]
Badescu, O. [2 ]
Popescu, P. [2 ]
Paraschiv, P. [2 ]
机构
[1] Observ Paris, IMCCE, F-75014 Paris, France
[2] Romanian Acad, Astron Inst, Bucharest 040557, Romania
[3] CNRS, Observ Paris, UMR8630, Paris, France
[4] Univ Fed Rio de Janeiro, Observ Valongo, BR-20080090 Rio De Janeiro, Brazil
[5] Observ Nacl MCT, BR-20921400 Rio De Janeiro, Brazil
来源
ASTRONOMY & ASTROPHYSICS | 2010年 / 509卷
关键词
methods: statistical; astrometry; reference systems; ephemerides; minor planets; asteroids:; general; CELESTIAL REFERENCE FRAME; ORDINARY DIFFERENTIAL-EQUATIONS; CCD ASTROGRAPH CATALOG; EVOLUTION; POSITIONS;
D O I
10.1051/0004-6361/200913172
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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.
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页数:8
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