minute of arc

(redirected from Arc-second)
Also found in: Dictionary, Thesaurus.

minute of arc

(arc minute; arc min) See arc second.
References in periodicals archive ?
40 kiloparsecs [1] and has an angular diameter of 16 arc-seconds [2].
05 arc-second at an infrared wavelength of 2 microns.
1 arc-second in diameter -- a scale beyond the resolving power of ground-based telescopes, says astronomer J.
The rates can be adjusted from less than 1 arc-second per second for guiding to a few degrees per second for slewing.
This means the location of any known asteroid (or a new one whose orbital elements you enter) can be computed to arc-second accuracy for any date and time between the years 1950 and 2020.
1 arc-second (comparable to what's needed to distinguish a car's right headlight from its left at a distance of 2,500 miles), is indeed about 10 times the average resolving power of today's ground-based telescopes.
Thanks to the VLA's arc-second resolution, ground-based astronomers should now be able to monitor the water content of Mars's atmosphere no matter what the planet's distance from Earth -- a boon to studies of its long-term climatic behavior.
The photo, one of 40 taken by an instrument called the Normal Incidence X-Ray Telescope, shows details as small as 1 arc-second -- about twice the resolution of previous images.
The unit incorporates a friction motor drive that boasts a peak-to-peak unguided tracking error of around 2 arc-seconds in exposures of up to 6 minutes.
Where Z is the linear scale value in arc-seconds per division.