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4 dni temu · The distance to Vega can be determined by measuring its parallax shift against the background stars as the Earth orbits the Sun. Giuseppe Calandrelli noted stellar parallax in 1805-6 and came up with a 4-second value for the star which was a gross overestimate.
1 dzień temu · When the visual and absolute magnitudes are known, the distance to the star can be calculated. The stars lie at a distance of 2.52 × 10 ^ 6 ± 0.14 × 10 ^ 6 ly (1.594 × 10 11 ± 8.9 × 10 9 AU) and the whole Andromeda Galaxy at about 2.5 × 10 ^ 6 ly (1.6 × 10 11 AU).
1 dzień temu · Sirius is a binary star system consisting of two white stars orbiting each other with a separation of about 20 AU (roughly the distance between the Sun and Uranus) and a period of 50.1 years.
10 cze 2024 · Alpha Centauri, triple star system that contains Proxima Centauri, the closest star to the Sun, about 4.2 light-years distant. The system is the third brightest star in the sky. The nearest extrasolar planets are the three planets that orbit Proxima Centauri.
17 cze 2024 · Using the radius of Earth’s orbit as the baseline, the distance of the star can be found from the parallactic angle, p. If p = 1″ (one second of arc), the distance of the star is 206,265 times Earth’s distance from the Sun—namely, 3.26 light-years.
17 cze 2024 · The true space motion, equal to (22 2 + 20 2) 1/2 or about 30 km per second, suggests that this star will make its closest approach to the Sun (at three light-years’ distance) some 280 centuries from now.
An Astronomical Unit is the distance between Earth and the Sun. The number of A.U. is the number of times the star is from the Earth compared to the Sun. When you use the 2007 distance, Vega is roughly 1,584,102.674 Astronomical Units from the Earth/Sun, give or take a few.
