- 2932 - GAIA - space telescope measure star’s motion. - The Gaia space telescope has measured the acceleration of the Solar System when it orbits the center of our Milky Way galaxy. The Gaia massive endeavor is to result in three-dimensional mapping of our galaxy, to be completed in 2024.
------------- 2932 - GAIA - space telescope measure star’s motion
- GAIA is a space telescope that is measuring the motion of the stars. Stars are suns that have their own solar systems. They are rotating systems of planets and moons not unlike what we have with our Sun. Everything in the Universe is in constant motion. Nothing is standing still. And, the space between everything is expanding.
-
- On December. 3, 2020, the European Space Agency (ESA) released observational data from the Gaia telescope (Gaia Early Data Release 3 or EDR3). Gaia accrues accurate knowledge about the Milky Way stars, distant extragalactic quasars, and the asteroids of our Solar System.
-
- Quasars are bright, star-like objects that allow for the determination of planet Earth’s orientation in space. With the help of their precise positions measured by Gaia, a new high-precision reference system can be constructed for defining the positions of stars, Solar System objects, and also satellites.
-
- The knowledge accrued by Gaia affects the precision of satellite navigation in the future. The satellite positions and Earth orientation in space are determined in a reference frame tied to the directions of quasars. The precision and state of the art of the reference frame are critical for the precision in navigation.
-
- The precise observations of quasars resulted, for the first time, in a successful computation of the acceleration of our Solar System. The acceleration of the Solar System towards the center of the Milky Way is (2.32±0.16) * 10-10 meters / sec. per sec.
-
- Gaia in the research of asteroids is responsible for the daily computation of orbits for asteroids. Before data releases, there is validation of Gaia observations of asteroid positions, brightness, and spectra.
-
- Gaia data focuses on asteroid orbits, rotation periods and pole orientations, masses, shapes, and surface structural and compositional properties. In the computation of collision probabilities for near-Earth asteroids.
-
- The Gaia data release in spring 2022 will be position and brightness data for tens of thousands of asteroids and, for the first time, asteroid spectra will also be released. The data has been collected by Gaia from the end of July 2014.
-
- The data includes position and brightness data of 1,810,000,000 stars and color data of 1.55 billion stars from the time period of 34 months. The data more than triples the number of quasars observed for precise reference frames to 1.61 million.
-
- Gaia observes astronomical objects systematically in the so-called L2 Lagrange point some 1.5 million kilometers from the Earth in the anti-sun direction. Gaia observes about two billion stars with a precision of one hundred millionths of a degree. The result will be a three-dimensional map of our galaxy.
-
- Based on the Gaia data, researchers have modeled the motion of stars in the Milky Way. They have produced an animation for the motion of 40,000 randomly selected stars on the sky 1.6 million years into the future.
-
- In the animation, short and long trails describe changes in stellar positions with 80,000 years. The former are mostly related to distant stars, whereas the latter are solely due to the nearby stars. Every now and then, short trails expand into long ones, and long trails shrink into short ones related to the changing distances of the stars.
-
- In the end of the animation, stars appear to be removed from the left and collected to the right. This is due to the Solar System’s motion relative to the stars. A similar phenomenon can be seen when moving from a center of a forest to its boundary , that is the trees in the front gradually disappear whereas they seem to be collected in the back.
-
- This data shows the average motion of the Solar System with respect to the surrounding stars. Movement of quasars is actually the movement of Solar System. More accurately, the apparent stellar streams include the information about the motion of the stars and the Solar System about the center of the Milky Way. The Gaia quasar observations allow for the determination of the acceleration related to this orbital motion.
-
- Gaia has measured the apparent motions of quasars on the sky. These motions are tiny, about one thousandth part of the motion of stars 3,000 light years from us. The apparent stream of quasars is directed toward the center of the Milky Way, that is, in the direction where the acceleration of the Solar System is pointing.
-
- Gaia has measured the absolute motion of the Solar System relative to the distant universe. This motion derives from the gravitational forces by the Milky Way and all other objects in the universe.
-
- December 9, 2020 GAIA - space telescope 2932
----------------------------------------------------------------------------------------
----- Comments appreciated and Pass it on to whomever is interested. ----
--- Some reviews are at: -------------- http://jdetrick.blogspot.com -----
-- email feedback, corrections, request for copies or Index of all reviews
--- to: ------ jamesdetrick@comcast.net ------ “Jim Detrick” -----------
--------------------- --- Wednesday, December 9, 2020 ---------------------------
No comments:
Post a Comment