Dates Of Last Observation Of Unusual Minor PlanetsThe following tables list the date of the last astrometric observation reported to the Minor Planet Center (MPC) for each of the unusual minor planets for which it is reasonable to make predictions (short-arc unperturbed orbits from past years are excluded). It is hoped that these tables will assist observers in planning a useful program of astrometric observation of these objects. Ephemerides (from updated orbits for the unnumbered objects listed, that are complete through the observations listed below) may be generated using the on-line Minor Planet Ephemeris Service.
Observers are reminded of the efficiency of making and reporting observations of specific objects on pairs of nearby nights, as the accuracy of an isolated single-night observation can be difficult to judge.
In the lists below, the objects are divided into three categories: one-opposition unnumbered objects; multiple-opposition unnumbered objects; and numbered objects. For reference, the following quantities are given for each object: the uncertainty parameter U (where available), the arc in days or the number of oppositions utilised in the orbit solution, and low-precision values of the semi-major axis, eccentricity and inclination. Objects observed within the past 15 days are indicated with an asterisk and those objects unobserved within this period that are on the most recent MPEC list of unusual objects are indicated with a `+'.
Enhanced 2000 Dec. 26. The lists below now allow easy access to MPES ephemerides of objects listed herein. Use the checkboxes on the left-hand side to select the objects (from any of the three lists) that you want to observe. Select your observing options from the bottom of the page and then select `Get ephemerides'. In the lists, the data given under `Currently' is as follows: current R.A. in decimal hours; current Decl. in decimal degrees; current V magnitude; current elongation; and current motion in deg/day. `Current' refers to the time this page was last updated.
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This document was last updated on 2023-10-02.30 UT