Astrophysics (Index)About

Tonantzintla Surveys

(surveys providing early images of quasars and Seyfert galaxies)

The still-referenced Tonantzintla Surveys were conducted in the 1950s and 1960s with the Schmidt camera at Mexico's Tonantzintla Observatory, largely looking for flaring stars, and incidentally imaging objects later identified as quasars and Seyfert galaxies. Discoveries were numbered and some objects are still identified by their Tonantzintla number.

Further reading:
TONTON S180or "Tonantzintla S180"