Finally, Zygo's Optics business segment is able to supply prisms with sub
arc-second angle tolerances, very flat surfaces and excellent transmitted wavefront characteristics.
These laser-optic-quality prisms feature a [+ or -]15
arc-second angular tolerance for guaranteed control of the optical path.
Solar granules are typically the size of Alaska--though they look small from Earth, a mere
arc-second or two across.
The mean sky brightness per square
arc-second based on these measurements are: B = 20.77[+ or -]0.03, V = 19.85[+ or -]0.04 R = 19.51[+ or -]0.04 and I = 18.40[+ or -]0.05.
With an angular measuring sensitivity of 1
arc-second (0.0003 degrees), tins system is ideal for aligning precision mounts and fixtures, antenna arrays, molding machine platens, press faces, and other assemblies.
Fixing a telescope to a particular celestial body against the rotation of the earth requires a drive that is precise, smooth and most especially, slow--to a 0.27
arc-second resolution in the image plane.
"We're likely to get very important microwave background observations on the degree, arc-minute, and
arc-second scales," says David N.
Now my list of resolved double stars includes a 0.04
arc-second double.
In particular, an unidentified foreground galaxy splits the quasar's image into two components separated in space by one
arc-second -- equivalent to a separation of about 10,000 light-years at the estimated location of the foreground galaxy.
Jeff Hester and his colleagues at the California Institue of Technology in Pasadena photographed this bright star, its gas halo and the surrounding interstellar medium in unprecedented detail, resolving structures just a few tenths of an
arc-second across.
minute of arc - a unit of angular distance equal to a 60th of a degree