Skip to main content

eggen cards

AAVSO Eggen Card Project

Olin Eggen was an astronomer, a photometrist; he measured the brightness of stars. But being of the last generation, his data was not recorded on a computer. He used 3x5 index cards. Lots of them. The goal of this project is to make the data he recorded in the last century available to researchers today. 

Searching the Cards

If you are a researcher and want to search the Eggen Card Database, you simply go to the Portal (link in the side panel to the right). There you just fill in the fields on the "Select Batch" line (probably only the "Star name" field) and hit Request. The Portal uses Simbad to resolve star name aliases, so put in what ever name you wish.

You will then be presented with the first of the card images that has information related to that star. You can move through the batch of cards meeting your request with the Next and Prev button on the Edit Card line.


This is an AAVSO project. It is managed by a volunteer, George Silvis (SGEO), and over seen by AAVSO HQ.

Communications about the project should be routed through the forum listed in the sidebar or directly to SGEO. Use this forum to discuss any problems with the portal, the project or whatever. Share tips on identifying stars too.

AAVSO 49 Bay State Rd. Cambridge, MA 02138 617-354-0484