Those involved with the UAT would like to thank the AIP, IOP, IVOA, AAS and IAU, as well as Robyn & Bob Shobbrook, Helen Knudsen, Marlene Cummins and Liz Bryson, who in the early 90s developed an earlier thesaurus, endorsed by the IAU, which the UAT has extensively drawn upon.

Starting around 2006, Rick Hessman began collecting modifications and updates to the 1993 IAU thesaurus, and supplied some of the motivation for the current exercise.

Metadata Crosswalk Project

The UAT Steering Committee would like to thank Kelsey Gibson, Katie Jones, and Jaihyun Park for their work building crosswalks between previous thesauri efforts and the UAT.

International Astronomical Union Thesaurus / Unified Astronomy Thesaurus Crosswalk
by Kelsey Gibson

Physics & Astronomy Classification Scheme Keywords / Unified Astronomy Thesaurus Crosswalk (pending)
by Katie Jones and Kelsey Gibson

International Virtual Observatory Alliance Thesaurus / Unified Astronomy Thesaurus Crosswalk
by Jaihyun Park (School of Information Studies, Syracuse University,

Astronomy Subject Keywords / Unified Astronomy Thesaurus Crosswalk
by Katie Frey



Intellectual Property Rights

The AAS holds the copyright for the UAT, who maintain nominal ownership and generally license the thesaurus out under the Creative Commons licensing model. The AIP and IOP are exceptions in that they receive non-exclusive licenses as they contributed portions of their thesauri in the development of the UAT.

Image Credit

Header images

The Cool Clouds of Carina. ESO/APEX/T. Preibisch et al. (Submillimetre); N. Smith, University of Minnesota/NOAO/AURA/NSF (Optical)

The Cat’s Paw and Lobster Nebulae. ESO.

Dusty Lane of the Milky Way. ESO/S. Guisard (

Chaotic Clouds of Jupiter. NASA/JPL-Caltech/SwRI/MSSS/Gerald Eichstädt /Seán Doran.

Cygnus – SHO by Nico Carver is licensed under a CC BY-SA 4.0 License.

HiRISE Catches an Avalanche on Mars. NASA/JPL-Caltech/University of Arizona