Recent NEAs
σ > 10" Or
Phase < 1°
Low dV

Tool Descriptions


Interactive table of observable NEOs.


Asteroid and observatory-specific ephemeris generator.


Build finder chart for a given asteroid and time.


Return orbital and physical properties for a given asteroid


Observability chart for asteroids and observatory.


Asteroids whose orbits are near one or more of the major planets.

Critical List of Asteroids

Asteroids in need of observation due to large ephemeris uncertainty.

Asteroid Orbital Elements

Access to, and information about, the astorb orbital elements database.

Lowell Observatory offers these tools to assist with asteroid observation planning and to faciliate data mining across multiple surveys. Orbital solutions are calculated in-house based on Minor Planet Center observations.

This website is in the process of being upgraded and as such is in beta status; some tools may experience bugs. If a bug is particularly important, please direct concerns to

Recent Updates

Date Update
January, 24, 2018 The asteroid observability plotting tool now includes and observing `window` with filterable parameters
November, 1, 2018 Inclusion of any available lightcurve data on AstInfo
October, 14, 2018 Introduction of the Asteroid observability charting tool. This tool assists in the planning of asteroid observations
September, 14, 2018 Database server hardware upgrades that will improve reliability.
August, 3, 2018 Significant improvements to UpObjects query response times. MPECs tickers is now recent NEAs ticker.
For the full history of updates see the updates page.