reported that the accuracy of its system depends largely on the accuracy of the means used to scale it.
That translates into 8 arc seconds
for flatness, not very accurate for today's ever-tightening tolerances," says Hamar.
Ifadaptive telescopes with electrically deformable mirrors and artificial guide stars can work together to overcome the problems of atmospheric turbulence, resolution could improve to 1/10 of an arc second
, Thompson says, the same resolution promised by the Hubble Space Telescope scheduled for launch in 1988.
Mounted to the gear reducer output shaft, they provide 0.27 arc second
resolution -- an improvement over the 14 arc second
resolution of the incremental encoders Toms previously used.
It shows hundreds of luminous blue stars packed into a region less than 5 arc seconds
(4 light-years) across.
McCarthy does not rule out the possibility that VB 8B is not there at all, but says it is more likely that the object has moved to about 1/2 arc second
from van Biesbroeck 8.
Last year's Arc second
Nakayama Festa broke smartly and jockey Masayoshi Ebina threatened to make it a stern test from the front.
Both Sarafina and Nakayama Festa, last year's Arc second
, will surely be using the race as a warm-up for the big one next month.
It holds that the angular resolution of images formed on photographic plates or electronic detectors should be typically about 1 arc second
. For a large telescope costing millions of dollars, such an outcome is disappointing; a 6-inch backyard telescope can also achieve 1-arc-second resolution!
Roundness and concentricity are measured to accuracy of 2 millionths of an inch, straightness and flatness to 10 millionths, tapers are accurate to 1/4 arc second
, and surface flatness to 2 micro inches.
By placing the cursor on any star or computed point of the asteroid's track, you can obtain the object's position with a formal precision of 0.01 arc second
. The chart may also be sent to a 9- or 24-pin dot matrix printer for a black-and-white hard copy.
However, his granddam is a half-sister to Group 1-placed Behkara, dam of Grand Prix de Paris winner Behkabad and high-class Beheshtam, descending from Arc second