Explanation of Symbols of the Priority List
The object category is estimated on the basis of five parameters derived from:
- The current ephemeris uncertainty
- The object's MOID
- The ephemeris uncertainty during the next apparition
- The number of days before the end of visibility
- The rate of decrease in magnitude and elongation from the sun during the last day of visibility.
For each object the following information is available:
The data for (*) are calculated for the date indicated at the top of the
- Priority (4 categories)
- Date in which the object was inserted in that particular category
- Right Ascension (*)
- Declination (*)
- Elongation (*)
- Visual Magnitude (*)
- Sky Uncertainty (*): it is the 1-sigma sky uncertainty
derived from the NEODyS database.
- End of Visibility. It is the last date of visibility of the object according
to this PLOT.
After months of testing with the precious contribution of a good number of
observing sites, we are now confident that a greater percentage of NEAs
will be prevented from being lost if these suggestions are followed.