J/A+A/468/L13 Photometry of the trans-Neptunian object 2005FY9 (Ortiz+, 2007)
Short term rotational variability in the large TNO 2005FY9.
Ortiz J.L., Santos-Sanz P., Gutierrez P.J., Duffard R., Aceituno F.
<Astron. Astrophys. 468, L13 (2007)>
=2007A&A...468L..13O 2007A&A...468L..13O
ADC_Keywords: Minor planets ; Photometry
Keywords: Kuiper Belt - monor planets, asteroids
Abstract:
The goal of this work is the study of 2005FY_9's short term
variability in order to determine the amplitude of the lightcurve,
which can be linked to the degree of elongation of the body or to the
degree of albedo heterogeneity on the surface. Besides, the rotation
period can be determined. CCD photometric observations of the
transneptunian object 2005FY_9 in R band on 21 nights spanning several
months have been carried out using the 1.5m telescope at Sierra Nevada
Observatory and the 2.2m telescope at Calar Alto Observatory. The time
series analysis results in confident detection of short-term
variability. The most significant periodicities are 11.24±0.01h
and its double, but other possibilities cannot be ruled out. The
22.48h double peaked rotational phase curve is slightly preferred
from our analysis. As for the amplitude of the lightcurve, we get a
peak to peak variability of 0.03±0.01mag. This result is
compatible with a nearly spherical body that has a very homogeneous
surface. There is also the possibility that the body is rotating
nearly pole on, but we believe this is less likely. Very weak
constraints are obtained for the density and internal strength based
on the rotational properties derived from the photometry.
Description:
Julian Date (light-time corrected) and relative magnitudes of 2005FY9.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 23 595 2005FY9 photometry
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d JD Julian date of observations
16- 23 F8.5 mag dmag Relative magnitude in R band
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Acknowledgements:
J.L. Ortiz, ortiz(at)iaa.es
(End) J.L. Ortiz [IAA-CSIC, Spain], Patricia Vannier [CDS] 23-Apr-2007