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 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:
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FileName Lrecl Records Explanations
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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.
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: tablea2.dat tablea4.dat
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Bytes Format Units Label Explanations
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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
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Note (1): Meaning that its solar elongation is greater than 50 degrees.
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Byte-by-byte Description of file: tablea3.dat
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Bytes Format Units Label Explanations
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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
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Note (1): Observers will check Table A4 to see the conditions of
observability of each event.
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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