As the angular scales involved are on milliarcsecond
scales, interferometric observations can settle the issue of the exact radius of the dust sublimation.
The resolution is 1 milliarcsecond
. Longitude The longitude of the GPS antenna.
These errors are at the level of a few milliarcseconds
. Another type of a possible systematic error is related to low elevation observations in case of north-south extension of the observation network.
The names of these two foreground stars are Luyten 143-23 and Ross 322; they move across the sky with apparent velocities of about 1,600 and 1,400 milliarcseconds
per year, respectively.
Using interferometry, astronomers have measured Regulus's ellipsoid as presented to Earth: It's 1.25 by 1.65 milliarcseconds
in size, with the long axis oriented north-south.
Georgia State University's CHARA Array on Mount Wilson is capable of achieving just under one-thousandth of one arcsecond of resolution (called a milliarcsecond
), which amounts to resolving a parking space seen at the Moon's distance.
Their parallax measurement, 0.539 [+ or -] 0.033 milliarcsecond
, 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
Data from Gaia's second release was used to identify each of the stars in the field of view, and allowed the position of the spacecraft to be calculated with astonishing precision -- up to 20 milliarcseconds
The estimated values of the accompanied complex amplitudes of GMJ excitations (in milliarcseconds
) are displayed in Table 1.