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We present photometric observations of the Kuiper-Belt object 1999 TD10 at dierent phase angles and for three dierent broad band filters ( B, V and R). This object was observed with the Danish 1.54-m telescope of ESO in Chile during six dierent observing nights corresponding to a phase angle of 0.30, 0.37, 0.92, 3.43, 3.48 and 3.66. Extra observations were obtained in September 2002 with the VLT UT1/FORS1 combination to confirm that 1999 TD 10 does not exhibit any cometary activity, and in October 2001 with the Sierra Nevada Observatory 1.50-m telescope in order to add relative magnitudes to improve the determination of the rotation period. The observations are compatible with a single-peaked rotational lightcurve with a 7h41:5min 0:1 min period or a double- peaked lightcurve with a 15h22:9min 0:1 min period. If a single-peaked rotational lightcurve is assumed the amplitude is 0:51 0:03, 0:49 0:05 and 0:60 0:09 mag for the R, V and B bands, respectively. We present the phase curve obtained when assuming that the lightcurve is single-peaked. This phase curve reveals clearly an increase of about 0.3 mag and of similar importance for the three bands when phase angle decreases from 3.7 to 0.3. The phase curve reveals a linear increase of the brightness with the decreasing phase angle and, consequently, does not permit a modeling of the opposition surge. Neverthless the poor repartition of the observational data does not permit a firm conclusion concerning the presence or absence of an opposition surge on the phase angle range covered by our data. Complementary observations are needed.

Photometry of the Kuiper-Belt object 1999 TD$_{\sf\sl 10}$ at different phase angles