AUSTIN, Texas — The National Science Foundation expects to significantly decrease the number of astronomy and astrophysics grants it awards in 2012 compared with 2011, an agency official said here Jan. 9 at the 219th meeting of the American Astronomical Society.

The National Science Foundation is the U.S. government agency that funds basic research into nonmedical science fields. In 2011, the agency awarded money to about 20 percent of all proposals submitted to its astronomy and astrophysics grant program.

In 2012, only about 16 to 18 percent of proposals will likely be funded, James Ulvestad, the director of the National Science Foundation’s Division of Astronomical Sciences, said. Ulvestad spoke at a National Science Foundation town hall here at this meeting of more than 2,700 astronomers and astrophysicists.

Ulvestad estimated that the money available for the grant programs in 2012 would be down by 10 to 15 percent compared with 2011, while the number of proposals submitted would increase by 10 percent. That means the fraction of them that get funding will have to decrease.

“We protected the grants programs in ’11 by creatively getting rid of other things, but they will go down in ’12, there’s just no way around it,” Ulvestad said to a packed room of anxious researchers here at the Austin Convention Center.

Ulvestad said the agency’s ability to fund research is also impacted by a few major astronomy research facilities coming on line in the coming years that will take up significant portions of the National Science Foundation’s astronomy funding.

One is the Atacama Large Millimeter Array, a collection of radio telescopes in Chile that took its first observations in 2011. Another is the Advanced Technology Solar Telescope, a facility under construction in Hawaii that will be the world’s largest sun-studying telescope.

“Those are things that have been coming for five years, 10 years, and it just happens they’re hitting at the same time that the budget is at extreme pressure,” Ulvestad said. “If we had these new facilities coming up and our budget was following an increasing path, it wouldn’t be this crisis feeling people have now. We’ve hit this confluence of unfortunate events.”