Designation of FIRST Sources

In referencing individual sources within the FIRST catalog, it is recommended that investigators use the full designation, namely:

FIRST Jhhmmss.s+ddmmss

in which the coordinates are equinox J2000.0 and are truncated (not rounded). This naming convention is registered with the International Astronomical Union and is in agreement with IAU recommendations found on the WWW at

For example, the FIRST source at RA(J2000)=08h00m00.099s, Dec(J2000)=+32°06'09.83" is named FIRST J080000.0+320609.