The Priority List is compiled daily by a programme that analyses the geometry and the sky uncertainty of each newly discovered NEO during the discovery (that is, current) apparition and the next apparition.

Narrator Flow is the mental state of apparition in which the person is fully immersed in what he or she is doing.

The goal is to make the sky uncertainty at the next apparition so small that the recovery of the NEO is virtually certain.

The fraction of newly discovered NEOs for which the follow up either ensured the recoverability at the first post discovery apparition or allowed a precovery grew from 55 to 69 per cent.

Halley's Comet, for example, is usually very bright when it passes through the inner Solar System every seventy six years, but during its 1986 apparition, its closest approach to Earth was almost the most distant possible.

Thus, before the operations of SCN started, almost one half of the newly discovered NEOs did not have good calculated orbits at the end of the discovery apparition, and SCN coordination reduced that fraction to less than one third.

The discovery apparition of this object presented a very peculiar geometry, such that, although the NEO was followed as long as possible, the astrometry acquired in this manner did not significantly contribute to the improvement of the calculated orbit.