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Orbit, abs. magnitude:

Lightcurve period, amplitude:

Observations:

This NEA has been observed from Ondrejov (four nights 1999 Mar. 6.9-24.9), by M. R. Kidger, J. Altozano, D. Hernandez, J. Marti and I. Ugarte with IAC-80 Telescope at Teide observatory, Spain (two nights 1999 Mar. 6.1 and 7.1), by N. D. James with 0.30-m telescope at Chelmsford, UK (one night 1999 Feb. 13.9) and D. Buczynski with 0.33-m telescope at Conder Brow, UK (one night 1999 Feb. 23.0).

The observations revealed a lightcurve with period (6.5107 +/- 0.0002) hr. In Figs. 1 and 2, composite lightcurves for this period are shown. A lightcurve amplitude increase is apparent during the observational interval; it was about 0.38 mag on Feb. 13.9-23.0 (solar phase angle 7-22 degrees), 0.50 mag on Mar. 6.1-8.8 (phase about 50 degrees), and about 0.8 mag on Mar. 24.9 (phase 76 degrees). A correlation of the amplitude with the solar phase angle is apparent; effects due to increasing phase angle are a likely explanation of the evolution of the lightcurve shape.

Fig. 1: Composite lightcurve

Some nightly lightcurves are discplaced by 0.4 mag up or down to facilitate inspection.

Fig. 2: Composite lightcurve

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