J/A+A/551/A102 Photometry of 16 Flora family asteroids (Kryszczynska, 2013)
Do Slivan states exist in the Flora family?
II. Fingerprints of the Yarkovsky and YORP effects.
Kryszczynska A.
<Astron. Astrophys. 551, A102 (2013)>
=2013A&A...551A.102K 2013A&A...551A.102K
ADC_Keywords: Solar system ; Minor planets ; Photometry
Keywords: minor planets, asteroids: general - techniques: photometric
Abstract:
It is known that the Yarkovsky effect moves small asteroids to
larger/smaller semimajor axes depending on their prograde/retrograde
spins. The YORP effect influences asteroid spin periods and spin axis
orientations so that they evolve in time. The alignment of the spin
vectors and correlations of the spin rates, now known as Slivan states
and observed among members of the Koronis family, are interpreted in
terms of the YORP effect and spin-orbit resonances. Splitting asteroid
families into prograde and retrograde groups has recently been
proposed as a result of the Yarkovsky effect. Prograde and retrograde
asteroids drift in different directions, and this has never been
observed directly.
The influence of the Yarkovsky and YORP effects should be observable
among objects in asteroid families, especially in the Flora family,
which lies close to the Sun and consists of many small objects.
The Flora family asteroids were modelled using the lightcurve
inversion technique. As a result the orientation of spin vectors,
shapes, and sidereal periods of rotation were obtained.
Description:
The files contain asteroid brightness and geometry for corresponding
epochs. These files were used for obtaining spin states and shape
models of the studied asteroids. Individual lightcurves within a file
are separated by an empty line, all lightcurves are relative.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
objects.dat 70 16 Asteroid fundamental parameters
281lcs.dat 112 684 Asteroid 281 Lucretia individual lightcurves
291lcs.dat 112 662 Asteroid 291 Alice individual lightcurves
352lcs.dat 112 669 Asteroid 352 Gisela individual lightcurves
367lcs.dat 112 759 Asteroid 367 Amicitia individual lightcurves
700lcs.dat 112 1016 Asteroid 700 Auravictrix individual lightcurves
770lcs.dat 112 762 Asteroid 770 Bali individual lightcurves
800lcs.dat 112 1153 Asteroid 800 Kressmannia individual lightcurves
825lcs.dat 112 1301 Asteroid 825 Tanina individual lightcurves
915lcs.dat 112 676 Asteroid 915 Cosette individual lightcurves
937lcs.dat 112 960 Asteroid 937 Bethgea individual lightcurves
1088lcs.dat 112 769 Asteroid 1088 Mitaka individual lightcurves
1188lcs.dat 112 541 Asteroid 1188 Gothlandia individual lightcurves
1219lcs.dat 112 1042 Asteroid 1219 Britta individual lightcurves
1675lcs.dat 112 719 Asteroid 1675 Simonida individual lightcurves
2017lcs.dat 112 719 Asteroid 2017 Wesson individual lightcurves
2156lcs.dat 112 790 Asteroid 2156 Kate individual lightcurves
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See also:
J/A+A/498/313 : Photometry of 3 main belt asteroids (Marciniak+, 2009)
J/A+A/508/1503 : Photometry of 3 main belt asteroids (Marciniak+, 2009)
J/A+A/529/A107 : Photometry of 4 main belt asteroids (Marciniak+, 2011)
J/A+A/545/A131 : Photometry of 8 main belt asteroids (Marciniak+, 2012)
J/A+A/546/A72 : Light curves of Flora region asteroids (Kryszczynska+, 2012)
Byte-by-byte Description of file: objects.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Ast Asteroid number
6- 16 A11 --- Name Asteroid name
18- 22 F5.2 mag H Absolute magnitude H parameter (1)
24- 27 F4.1 km Diam ? IRAS diameter (1)
29- 36 F8.6 deg i Inclination (1)
38- 47 F10.8 --- e Eccentricity (1)
49- 58 F10.8 AU a Semimajor axis (1)
60- 70 A11 --- FileName Name of the file containing the light curve
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Note (1): Data from The Asteroid Orbital Elements Database, Cat. B/astorb.
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Byte-by-byte Description of file: *lcs.dat
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Bytes Format Units Label Explanations
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2- 15 F14.6 d JD JD epoch corrected for the light-time
corresponding to the Earth-asteroid distance
17- 28 E12.6 --- br Relative brightness in intensity units,
mean brightness of each lightcurve is unity
30- 42 E13.6 AU Sx x component of the vector from the asteroid to
the Sun in J2000 ecliptic Cartesian coordinates
44- 56 E13.6 AU Sy y component of the vector from the asteroid to
the Sun in J2000 ecliptic Cartesian coordinates
58- 70 E13.6 AU Sz z component of the vector from the asteroid to
the Sun in J2000 ecliptic Cartesian coordinates
72- 84 E13.6 AU Ex x component of the vector from the asteroid to
the Earth in J2000 ecliptic Cartesian coordinates
86- 98 E13.6 AU Ey y component of the vector from the asteroid to
the Earth in J2000 ecliptic Cartesian coordinates
100-112 E13.6 AU Ez z component of the vector from the asteroid to
the Earth in J2000 ecliptic Cartesian coordinates
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Acknowledgements:
Agnieszka Kryszczynska, agn(at)amu.edu.pl
References:
Kryszczynska et al., Paper I 2012A&A...546A..72K 2012A&A...546A..72K, Cat. J/A+A/546/A72
(End) A. Kryszczynska [Astron. Obs. Inst.], P. Vannier [CDS] 24-Jan-2013