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J/A+A/509/A27    Near-Earth asteroids & QSOs close approaches   (Nedelcu+, 2010)

Apparent close approaches between near-Earth asteroids and quasars. Precise astrometry and frame linking. Nedelcu D.A., Birlan M., Souchay J., Assafin M., Andrei A.H., Badescu O., Popescu P., Paraschiv P. <Astron. Astrophys. 509, A27 (2010)> =2010A&A...509A..27N
ADC_Keywords: Minor planets ; Positional data ; Solar system Keywords: methods: statistical - astrometry - reference systems - ephemerides - minor planets, asteroids: general Abstract: We investigated the link between the International Celestial Reference Frame (ICRF) and the dynamical reference frame realized by the ephemerides of the Solar System bodies. 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). In the designated period (2010-2018), we found a number of 2924, 14257, 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. Description: Closest apparent approaches of relatively bright asteroids and quasars in 2010-2018 File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file appulses.dat 111 106 Near Earth Asteroids - Quasars appulses between 2010 and 2018
See also: J/AJ/127/3587 : VLBI-Ext2 (Fey+, 2004) J/ApJS/141/13 : First VLBA calibrator survey: VCS1 catalog (Beasley+, 2002) J/AJ/126/2562 : Second VLBA calibrator survey: VCS2 (Fomalont+, 2003) J/AJ/129/1163 : Third VLBA calibrator survey: VCS3 (Petrov+, 2005) J/AJ/131/1872 : Fourth VLBA calibrator survey: VCS4 (Petrov+, 2006) J/A+A/494/799 : Large Quasar Astrometric Catalogue (LQAC) (Souchay+, 2009) Byte-by-byte Description of file: appulses.dat
Bytes Format Units Label Explanations
1- 3 A3 --- Ref [ABC-] Reference flag (1) 5- 19 F15.11 deg RAdeg Right ascension in decimal degrees (J2000) (2) 21- 35 F15.11 deg DEdeg Declination in decimal degrees (J2000) (2) 37- 41 F5.2 mag Umag ?=- Photometric magnitude in Optical U band (2) 43- 47 F5.2 mag Bmag ?=- Photometric magnitude in Optical B band (2) 49- 53 F5.2 mag Vmag ?=- Photometric magnitude in Optical V band (2) 55- 59 F5.2 mag Rmag ?=- Photometric magnitude in Optical R band (2) 61- 65 F5.2 mag Imag ?=- Photometric magnitude in Optical I band (2) 67- 82 A16 --- Date Date of the close approach (YYYY/MM/DD.ddddd) 84- 89 I6 --- Ast The asteroid number 91- 95 F5.2 mag Vast The estimated V magnitude of the asteroid 97-101 F5.2 arcsec Dist The minimum apparent asteroid-quasar distance 103-107 F5.1 deg Sol Solar elongation angle 109-111 I3 --- N* The number of UCAC2 stars in a 10'x10' field centered at the quasar J2000 position
Note (1): Quasars flag from LQAC, Cat. J/A+A/494/799: A = ICRF-Ext2 (Fey et al., Cat. J/AJ/127/3587, ICRF-EXT.2) B = VLBA (Beasley et al., Cat. J/ApJS/141/13, VCS1, Fomalont et al., Cat. J/AJ/126/2562, VCS2) C = VLA-015, VLA catalog minus 15 sources, (Cat. J/ApJS/141/13, J/AJ/126/2562, J/AJ/129/1163, J/AJ/131/1872) Note (2): Position and photometric magnitudes are from the Large Quasar Astrometric Catalogue (LQAC), Cat. J/A+A/494/799
Acknowledgements: Dan Alin Nedelcu, nedelcu (at)
(End) Dan Alin Nedelcu [A.I.R.A.], Patricia Vannier [CDS] 10-Dec-2009
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