Coordinates are then entered with an allowable resolution of 1 milliarcsecond
for latitude and longitude and 1 cm for altitude, and are saved by touching the Save button.
an hour) that Hubble could actually photograph its movement in a few hours.
Each degree in the 180 degrees is composed of 60 minutes, and each minute is composed of 60 seconds, and a thousandth of a second is a milliarcsecond
The amplitudes are below 1 milliarcsecond
for diurnal and sub-diurnal variations, and several milliarcseconds
for longer periods.
The stars move on the sky only about one milliarcsecond
a year, which would be like watching a golf ball on the Moon moving one foot per month.
(mas), their dominant part being the retrograde Free Core Nutation (FCN) with the period of about 430 days.
In a microlensing event, one star passes in front of another from our perspective, and this alignment--within a fraction of a milliarcsecond
(1/3,600,000[degrees])--boosts the light of the background star like a magnifying glass would.
To look at it another way, that's a resolution of about 1 milliarcsecond
, hundreds of times finer than any amateur telescope could ever resolve directly.
diameter: The disk is at least 12 milliarcseconds
in length by 1.
, yields a distance of 6,070 [+ or -] 300 light-years, more than a threefold improvement.
The images come from an array of radio telescopes in Australia, South Africa, Chile, and Antarctica known as TANAMI (Tracking Active Galactic Nuclei with Austral Milliarcsecond
During the close alignment, Stein 2051 B deflected the starlight, which appeared offset by about 2 milliarcseconds
from its actual position.