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J/A+A/406/751       Close encounters of asteroids 2003-2020      (Fienga+, 2003)

Close encounters of asteroids before and during the ESA GAIA mission. Fienga A., Bange J.F., Bec-Borsenberger A., Thuillot W. <Astron. Astrophys. 406, 751 (2003)> =2003A&A...406..751F
ADC_Keywords: Minor planets Keywords: minor planets, asteroids - astrometry - celestial mechanics - methods: observational Description: Selection have been made of asteroids-asteroids close encounters inducing perturbations large enough to deduce masses of perturbing objects. In tablea1.dat, and tablea3.dat, the epoch of encounters is given as well as the impact parameter, the relative distance and the criterion of maximum deflection (see section 2). The epoch of encounters is defined as the epoch when the relative distance or velocity between the two asteroids become minimum or the criterion of deflection becomes maximum. The (Δα,Δδ) given in tables are the maximum differences in right ascension and declination between the perturbed and the unperturbed orbits and the epoch of maximum (Δα,Δδ) is defined as the mean epoch for the maximum values of (Δα,Δδ). Finally, in tablea2.dat and tablea4.dat, we give the observability of each encounters. We give the periods when the asteroids have a mean solar elongation greater than 50 degrees and when the perturbations of the orbits induced by the Multiple Gravitational Event (MGE) are greater than 50 mas. Mean values of these perturbations in right ascension and declination computed over the corresponding periods are given in Columns 4 and 5. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tablea1.dat 69 605 Multiple MGE (Multiple Gravitational Event) detected from 2003 to 2022 inducing perturbations of orbits in right ascension and declination greater than 50mas. tablea2.dat 44 859 Table of observability for multiple MGE detected from 2003 to 2022 inducing perturbations of orbits in right ascension and declination greater than 50mas. tablea3.dat 64 160 Single MGE detected from 2003 to 2022 inducing perturbations in right ascension and declination greater than 50mas. tablea4.dat 44 1530 Table of observability for Multiple MGE detected from 2010 to 2022 inducing perturbations in right ascension and declination greater than 1mas and smaller than 50mas.
Byte-by-byte Description of file: tablea1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Perturber Designation of the Perturber Asteroid 5- 8 I4 --- Target Designation of the Target Asteroid 10- 11 I2 --- NMGE Number of Multiple Gravitational Event (MGE) 13- 19 A7 "MM/YYYY" Epoch.MGE MGE Epoch 21- 26 F6.4 AU Impact Impact parameter 28- 34 F7.4 km/s Vel Relative velocity 36- 43 F8.2 --- Defl Criterion of maximum deflection (G1) 44- 52 F9.2 mas DRA Maximum difference in right ascension 54- 61 F8.2 mas DDE Maximum difference in declination 63- 69 A7 "MM/YYYY" Epoch.DRA Mean period to observe the maximum differences in right ascension and declination
Byte-by-byte Description of file: tablea2.dat tablea4.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Perturber Designation of the Perturber Asteroid 5- 8 I4 --- Target Designation of the Target Asteroid 10- 11 I2 --- Nobs Number of periods when the perturbed asteroid is observable (1) 13- 19 A7 "MM/YYYY" ObsB Begining of observability Period 21- 27 A7 "MM/YYYY" ObsE Ending of observability Period 29- 36 F8.2 mas DRA Mean value of the induced perturbation in right ascension during the period of observability 38- 44 F7.2 mas DDE Mean value of the induced perturbation in declination during the period of observability
Note (1): Meaning that its solar elongation is greater than 50 degrees.
Byte-by-byte Description of file: tablea3.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Perturber Designation of the Perturber Asteroid 5- 8 I4 --- Target Designation of the Target Asteroid 10- 16 A7 "MM/YYYY" Epoch.MGE Multiple Gravitational Event (MGE) epoch (1) 18- 23 F6.4 AU Impact Impact parameter 25- 30 F6.4 km/s Vel Relative velocity 32- 40 F9.2 --- Defl Deflection criterion (G1) 42- 48 F7.2 mas DRA Maximum difference in right ascension 50- 56 F7.2 mas DDE Maximum difference in declination 58- 64 A7 "MM/YYYY" Epoch.DRA Mean period to observe the maximum differences in right ascension and declination
Note (1): Observers will check Table A4 to see the conditions of observability of each event.
Global Notes: Note (G1): the deflection criterion is a number directly related to the deviation occurring in a close approach between two asteroids. It is proportional to m/rv2, where v is the relative velocity between the two bodies, m is the mass of the perturbing asteroid, and r is the minimal distance at close encounter.
Acknowledgements: Agnes Fienga
(End) Patricia Bauer [CDS] 29-Apr-2003
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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