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Lightcurves of 32 Large Transneptunian Objects | | Susan D. Benecchi
; Scott S. Sheppard
; | | Date: |
24 Jan 2013 | | Abstract: | We present observations of 32 primarily bright, newly discovered
Transneptunian objects observable from the Southern Hemisphere during 39 nights
of observation with the 2.5-m telescope at Las Campanas Observatory. Our
dataset includes objects in all dynamical classes, but is weighted towards
Scattered objects. We find 15 objects for which we can fit periods and
amplitudes to the data, and place lightcurve amplitude upper limits on the
other 17 objects. Combining our sample with the larger sample in the
literature, we find a 3-sigma correlation between lightcurve amplitude and
absolute magnitude with fainter objects having larger lightcurve amplitudes. We
looked for correlations between lightcurve and individual orbital properties,
but did not find any statistically significant results. However, if we consider
lightcurve properties with respect to dynamical classification, we find
statistically different distributions between the Classical-Scattered and
Classical-Resonant populations, respectively, with the Classical objects having
larger amplitude lightcurves. The properties of binary lightcurves are largely
consistent with the greater population except in the case of tidally locked
systems. All the Haumea family objects measured so far have lightcurve
amplitudes le 0.3 magnitudes and rotation periods le 10 hours suggesting that
they are not significantly different from the larger population, although no
large amplitudes have yet been measured among this group. We expect multiple
factors are influencing object rotations: object size dominates lightcurve
properties except in the case of tidal, or proportionally large collisional
interactions with other objects, the influence of the latter being different
for each sub-population. We also present phase curves and colors for some
objects; our values are not significantly different from those presented in the
literature for other samples. | | Source: | arXiv, 1301.5791 | | Services: | Forum | Review | PDF | Favorites | |
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