Minor Planet Opposition Calculator

This calculator is used to find the ephemeris for a minor planet at, or near, its next opposition. To return results for 0hr UT, check the zero hour option. Tolerance is used to determine the lower and upper bounds (default=0.25) to search around 180° i.e.(Δ = |λSun - λAsteroid| ≈ 180.0° ±Tolerance). Frequency defines the Julian Date time increment for each iteration. The default is 0.125 (3 hours). It is possible to narrow the tolerance so much that it never arrives at a solution. The default settings produce results most efficiently. The application halts computations after 1000 iterations. Geographic location is useful only for determining the positions of the Sun, Moon and Object results.


Month Day Year Hour Min Sec  

City State Country
Latitude Longitude Elevation (Meters)  


Designation or Name Zero Hour Tolerance Frequency