J/MNRAS/469/4400 Veritas family members Yarkovsky drift rates (Carruba+, 2017)
Detection of the Yarkovsky effect for C-type asteroids in the Veritas family.
Carruba V., Vokrouhlicky D., Nesvorny D.
<Mon. Not. R. Astron. Soc. 469, 4400-4413 (2017)>
=2017MNRAS.469.4400C 2017MNRAS.469.4400C (SIMBAD/NED BibCode)
ADC_Keywords: Minor planets
Keywords: celestial mechanics - minor planets - asteroids: general
Abstract:
The age of a young asteroid family can be determined by tracking the
orbits of family members backward in time and showing that they
converge at some time in the past. Here we consider the Veritas
family. We find that the membership of the Veritas family increased
enormously since the last detailed analysis of the family. Using
backward integration, we confirm the convergence of nodal longitudes
Ω, and, for the first time, also obtain a simultaneous
convergence of pericenter longitudes ϖ. The Veritas family is
found to be 8.23+0.37-0.31Myr old. To obtain a tight convergence
of Ω and ϖ, as expected from low ejection speeds of
fragments, the Yarkovsky effect needs to be included in the modeling
of the past orbital histories of Veritas family members. Using this
method, we compute the Yarkovsky semi-major axis drift rates, da/dt,
for 274 member asteroids. The distribution of da/dt values is
consistent with a population of C-type objects with low densities and
low thermal conductivities. The accuracy of individual da/dt
measurements is limited by the effect of close encounters of member
asteroids to (1) Ceres and other massive asteroids, which cannot be
evaluated with confidence.
Description:
Data about 274 identified Veritas members, their absolute magnitude,
proper a, e, sin(i), g, and s, Lyapunov exponent (multiplied by a
factor 10+6), and estimated mean Yarkovsky drift speed, in AU/Myr
(no such value is available for (1086) Nata itself, that because of
its relative large size has very limited Yarkovsky mobility).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
veritas.dat 77 274 Data about 274 identified Veritas members
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See also:
B/astorb : Orbits of Minor Planets (Bowell+ 2014)
J/MNRAS/433/2075 : Asteroid families identification (Carruba+, 2013)
J/AJ/151/164 : Properties of asteroids in Karin cluster (Carruba+, 2016)
J/MNRAS/458/1117 : Possible Ceres asteroid paleo-family (Carruba+, 2016)
Byte-by-byte Description of file: veritas.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- Number Asteroid identification
8- 12 F5.2 mag H Absolute magnitude
14- 21 F8.6 AU a Semi-major axis
23- 30 F8.6 --- e Eccentricity
32- 39 F8.6 --- sini Sine of inclination
41- 50 F10.6 arcsec/yr g Precession frequency of pericenter
52- 61 F10.6 arcsec/yr s Precession frequency of node
63- 66 F4.2 10+6yr-1 LCE Lyapunov Characteristics Exponent
68- 77 A10 AU/Myr Drift Drift speed
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Acknowledgements:
Valerio Carruba, vcarruba(at)feg.unesp.br
References:
Kopylova & Kopylov, 1998PAZh...24..573K 1998PAZh...24..573K, (1998AstL...24..491K 1998AstL...24..491K)
Structure and dynamic state of the Corona Borealis supercluster
(End) Valerio Carruba [UNESP, Brazil], Patricia Vannier [CDS] 12-May-2017