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

Tool Descriptions


Interactive table of observable NEOs.


Asteroid and observatory-specific ephemeris generator.


Return all known designations for a given asteroid.


Observability chart for a given asteroid and observatory.


Build finder chart for a given asteroid and time.


Plot field stars and asteroids at a given time and location.

Hierarchical Observation Protocol

Generate prioritized list of observable asteroids based on observability criteria.


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

Critical List of Asteroids

List of asteroids in need of observation due to large ephemeris uncertainty.

Asteroid Orbital Elements

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

LONEOS Observations

Access the archived LONEOS asteroid observations database.

Star Catalogs

Query tool to access the USNO and PPM star catalogs.

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
August, 3, 2018 Significant improvements to UpObjects query response times. MPECs tickers is now recent NEAs ticker.
February, 22, 2018 Better DevOps and testing that should improve stability.
September, 29, 2017 Dynamical type is now included in the database. UI overhaul. New important lists tickers on home page. New updates page with full history of updates. UpObjects plots. Bug fixes.
January, 09, 2017 Reorganized home page. Updates to backend database hardware and schema. Fixed asteph date rounding errors. Observatory list now pulls from database. Minor aeshthetic/organizational updates.
November, 29, 2016 Improved Asteph page. Moved to new backend ephemeris tool. Now includes lunar elongation and airmass. Streamlined form fields. Made table generation faster. Removed multiple object option. UpObjects page now has dynamically adjusting table based on changing form fields.
For the full history of updates see the updates page.