5 research outputs found
VizieR Online Data Catalog: Light curves of Flora region asteroids (Kryszczynska+, 2012)
VizieR Online Data Catalog. vol. 354.The files contain asteroid brightness, aspect data and observing information for corresponding date. These files were used for obtaining synodic period rotation. Individual lightcurves within a files are identified with a light curve number, all lightcurves are relative. (2 data files)
Do Slivan states exist in the Flora family?
Context. Recent studies have uncovered evidence that the statistical
properties of asteroids’ physical parameters are a fundamental source of information on
the physics of their collisions and evolution. The analysis of the spin rates and spin
vector distributions helps us to understand the role of various known and new effects. The
alignment of spin vectors and the correlation of spin rates are for the first time
observed for ten members of the Koronis family. These unexpected non-random orientations
of the spin axes and correlations of the spin rates, now known as Slivan states are
interpreted in terms of a YORP effect and spin-orbit resonances.
Aims. To study non-gravitational-effects, there appears to be a need for
new observational campaigns devoted to determining the physical parameters of the asteroid
families.
Methods. We analysed the photometric observations of the asteroids,
which are the most efficient method of studying asteroid physical parameters.
Results. We report the results of a ten-year long observational survey
of the light variations of objects in the Flora region. We present 544 individual
lightcurves of 55 objects obtained at various observing geometries. These lightcurves
yield new or refined synodic periods for 32 asteroids and confirm period determinations
for 23 objects in our sample. To improve the statistics of the Flora family objects, we
add to our dataset 91 objects with reliably determined periods. The distribution of
rotation rates for the Flora family is non-Maxwellian at a confidence level of 94% and
different from those of the Koronis and the Hungaria families. It seems to be consistent
with the long-term influence of the YORP effect, although it is also indicative of a
younger age for the Flora family compared to both the Koronis and the Hungaria families.
Conclusions. Our new data is a foundation for the spin vector and shape
determinations that will be the objectives of the second paper of the series. We search
for spin vector and spin periods correlations in order to determine whether Slivan states
exist in the Flora family
VizieR Online Data Catalog: Light curves of Flora region asteroids (Kryszczynska+, 2012)
VizieR Online Data Catalog. vol. 354.The files contain asteroid brightness, aspect data and observing information for corresponding date. These files were used for obtaining synodic period rotation. Individual lightcurves within a files are identified with a light curve number, all lightcurves are relative. (2 data files)