Earth Orbiting Satellite Observing Program

Earth Orbiting Satellite Observing Program Coordinator:

Tom DeClue
Colorado Springs Astronomical Society
P.O. Box 16318
Colorado Springs, CO 80935-6318




Welcome to the Astronomical League's Earth Orbiting Satellite Observing Program (EOSOC). The purpose of this Observing Program is to introduce observers, new to satellite observing, with the terminology and techniques of tracking satellites. The list of objects required for the certification include targets that can be easily tracked using the unaided eye or binoculars, including the international space station - Alpha, several operational vehicles, and numerous rocket bodies such as GPS (Global Positioning System) satellites, Russian Molniya spacecraft, and even geosynchronous/geostationary satellites. Some of the smaller targets may require telescopes and/or photographic techniques to identify.

To obtain more information about this observing program, please visit the web site at Colorado Spring's EOSOC Introduction.

The EOSOC is supported and maintained by the membership of the Colorado Springs Astronomical Society, of Colorado Springs, Colorado. Our club is dedicated to observing the night sky and educating the community. The EOSOC is just an extension of our club and we hope that you will enjoy it.

Citizen Science

Although not required for the Earth Orbiting Satellite Observing Program certification, you can also submit your data to the Trusat database.  This action is required if you are pursuing satellites as a Citizen Science certification with the Astronomical League.  The Trusat website can be accessed by clicking here:

To qualify for the AL's EOSOC certificate and pin, you need only be a member of the Astronomical League, either through an affiliated club or as a Member at Large. If you are not a member now, click here to view information on becoming a member.

To see what kinds of observations are necessary to fulfill the requirements of this observing club, please visit the link at the Colorado Spring's Tutorial Page.

Every observation log must include:  

  • Name of object
  • Date and Time (local or UT)
  • Latitude and Longitude
  • Seeing and Transparency
  • A sketch of the observation

Submitting for Certification

To receive your EOSOC Certificate and Pin, send a COPY of your observations, along with your name, mailing address, email address, phone number, society affiliation, and to whom the certification should be sent, to:


Earth Orbiting Satellite Observing Program Chair:

Tom DeClue
Colorado Springs Astronomical Society
P.O. Box 16318
Colorado Springs, CO 80935-6318

Upon verification of your observations, your certificate and pin will be sent to you or your society's Awards Co-ordinator, whomever you choose.



Frequently Asked Questions
Additional Resources
Tutorial Introduction
Observation Log - MS Word Format
Observation Log - PDF Format
Observation Checklist - Excel Format
Find Your EOSOC Program Award