Photometric observations of 9 Near-Earth Objects

Abstract

We present new CCD observations of nine Near-Earth Asteroids carried out between February, 1999 and July, 2000. The bulk of the data was acquired through an R_C filter, while the minor planet 11405 was observed without filter. We could determine synodic periods and amplitudes for 5 asteroids, 699: 3.3 h, 0.18 mag; 1866: 2.7 h, 0.12 mag; 1999 JD6: 7.68 h, 1.2 mag; 2000 GK137: 4.84 h, 0.27 mag; 2000 NM: 9.24 h, 0.30 mag. Based on observations taken at different phases, we could infer a phase parameter m of 0.018+/-0.005 for 1865 Cerberus. An epoch-method yielded a sidereal period of 0.27024003(5) d for this object with retrograde rotation. The remaining 3 objects have only partial coverage, thus no firm conclusion on their synodic period is possible.