Lightcurve results for 7186 Tomioka.
Period 7.309 +/- 0.01 hours. Amplitude 0.3 +/- 0.05 magnitude.
Asteroid 7186 Tomioka is a main belt asteroid with an estimated diameter of 10 km. It was discovered in 1991. The semi-major axis is 2.22 AU, the eccentricity is 0.201 and the inclination is 4.81 degrees.
Observations of this asteroid were made on 5 nights during June, 2007. Attempts to derive a two-peak lightcurve were inconclusive. The data would fit a single peak curve with a period of 7.309 hours, as shown below, but clearly only a portion of the lightcurve has been covered. This is an asteroid that could benefit from international collaboration.