Lightcurve results for 1720 Neils. Derived period 9.976 hours. Amplitude 0.15 magnitude.
1720 Neils is a main belt asteroid with an estimated diameter of about 10 km. It was discovered on February 7, 1935 by K. Reinmuth at Heidelberg. The semi-major axis is 2.18 AU, the eccentricity is 0.104 and the inclination is a low 0.73 degrees.
Although observations of this asteroid were made on four nights, the duration for each night was never more than 4½ hours. This duration, combined with a single-peak period of close to 10 hours, meant that only a small portion of the light curve was covered each night. The accompanying lightcurve is based on a single peak that best fitted the data and to call it uncertain is probably being generous!