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Title:
Photometric study of Centaur (60558) 2000 EC98 and trans-neptunian object (55637) 2002 UX25 at different phase angles
Authors:
Rousselot, P.; Petit, J.-M.; Poulet, F.; Sergeev, A.
Affiliation:
AA(Observatoire de Besançon, B.P. 1615, 25010 Besançon Cedex, France), AB(Observatoire de Besançon, B.P. 1615, 25010 Besançon Cedex, France), AC(Institut d'Astrophysique Spatiale, France), AD(ICAMER, Ukraine)
Publication:
Icarus, Volume 176, Issue 2, p. 478-491. (Icarus Homepage)
Publication Date:
08/2005
Origin:
ELSEVIER
DOI:
10.1016/j.icarus.2005.03.001
Bibliographic Code:
2005Icar..176..478R

Abstract

We present photometric observations of Centaur (60558) 2000 EC98 and trans-neptunian object (55637) 2002 UX25 at different phase angles and with different filters (mainly R but also V and B for some data). Results for 2000 EC98 are: (i) a rotation period of 26.802±0.042 h if a double-peaked lightcurve is assumed, (ii) a lightcurve amplitude of 0.24±0.06 for the R band, (iii) a phase curve with H=9.03±0.01 and G=-0.39±0.08 (R filter) and H=9.55±0.04 and G=-0.50±0.35 (V filter) or a slope of 0.17±0.02 magdeg (R filter) and 0.22±0.06 (V filter), (iv) the color indices B V=0.76±0.15 and V R=0.51±0.09 (for α=0.1 0.5°) and 0.55±0.08 (for α=1.4 1.5°). The rotation period is amongst the longest ever measured for Centaurs and TNOs. We also show that our photometry was not contaminated by any cometary activity down to magnitude ≃27/arcsec. For 2002 UX25 the results are: (i) a rotation period of 14.382±0.001 h or 16.782±0.003 h (if a double-peaked lightcurve is assumed) (ii) a lightcurve amplitude of 0.21±0.06 for the R band (and the 16.782 h period), (iii) a phase curve with H=3.32±0.01 and G=+0.16±0.18 or a slope of 0.13±0.01 magdeg (R filter), (iv) the color indices B V=1.12±0.26 and V R=0.61±0.12. The phase curve reveals also a possible very narrow and bright opposition surge. Because such a narrow surge appears only for one point it needs to be confirmed.
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