|OAS - Osservatorio Astronomico Sormano|
|OAS > MBPL - Minor Body Priority List ( Asteroids with H < = 22.0 or greater than 240 mt in diameter )|
Last update: September 24, 2021
Computations by: Francesco Manca,..Piero Sicoli,..Augusto Testa (email@example.com).
This list includes selected asteroids for which observations and/or identifications are most desirable because
hazardous close encounters with our planet could be predicted or, taking into account the current uncertainty of the
orbital elements, cannot be entirely ruled out.
For this reason we do not take into account asteroids with Earth-MOID (Minimum Orbital Intersection Distance) values larger than a given threshold, sufficient to exclude the possibility of very close approaches.
As a rule of thumb, we consider potentially dangerous all the asteroids included in the following table, where the [U] symbol represents the uncertainty orbital parameter adopted by the Minor Planet Center (see MPC 24597 and the related page).
Uncertainty Earth MOID limit number (AU)
7<= U 0.082 5<= U <= 6 0.045 U = 4 0.028 2<= U <= 3 0.019 0<= U <= 1 0.015
Predicted close encounters with the Earth are calculated, as a function of the orbit uncertainty, covering a timespan from 7 to 200 years. For all the entries Earth-MOID and close approaches (bold-type for distances <= 0.010 AU) are daily recomputed at each MPC orbit update using a software package developed at Sormano Observatory by A. Testa (unpublished, 1993 and 2016) and internal report N.50 (F. Manca, G. Matarazzo and P. Sicoli, 1996).
A similar list for objects of smaller size (H > 22.0) is available at SAEL (Small Asteroids Encounters List).
Close encounters within 3 Lunar Distances are summarized at TECA (Table Earth Close Approaches), including the minimum and maximum miss distances in Km.
For related information:
Close Encounters and Selected Objects lists:
The following service, courtesy of the Minor Planet
Center, is intended as support and in addition to the objects available in the MBPL list for which follow-up or recovery is needed.
The service will return all objects (NEOs and Comets) based on criteria specified by the user and
NOT filtered in relation to their MOID value or PHA status.
Astrometric observations of any of the following objects should be sent directly