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Stellar kinematics
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In astronomy, stellar kinematics is the observational study or measurement of the kinematics or motions of stars through space.
Relation between proper motion and velocity components of an object. At emission, the object was at distance d from the Sun, and moved at angular rate
Relation between proper motion and velocity components of an object. At emission, the object was at distance d from the Sun, and moved at angular rate μ radian/s, that is, μ = vt / d with vt = the component of velocity transverse to line of sight from the Sun. (The diagram illustrates an angle μ swept out in unit time at tangential velocity vt.)
Four runaway stars moving through regions of dense interstellar gas and creating bright bow waves and trailing tails of glowing gas. The stars in thes
Four runaway stars moving through regions of dense interstellar gas and creating bright bow waves and trailing tails of glowing gas. The stars in these NASA Hubble Space Telescope images are among 14 young runaway stars spotted by the Advanced Camera for Surveys between October 2005 and July 2006.
Positions and trajectories of 20 high-velocity stars as reconstructed from data acquired by Gaia, overlaid on top of an artistic view of the Milky Way
Positions and trajectories of 20 high-velocity stars as reconstructed from data acquired by Gaia, overlaid on top of an artistic view of the Milky Way
Runaway star speeding from 30 Doradus. Image taken by the Hubble Space Telescope.
Runaway star speeding from 30 Doradus. Image taken by the Hubble Space Telescope.
Ursa Major moving group
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The Ursa Major Moving Group, also known as Collinder 285 and the Ursa Major association, is the closest stellar moving group – a set of stars with common velocities in space and thought to have a comm
Stellar kinematics
…studied intensely by Olin Eggen in the 1960s. A list of the nearest young moving groups has been compiled by López-Santiago et al. The closest is the Ursa Major Moving Group which includes all of the stars in the Plough / Big Dipper asterism except for Dubhe and Alkaid. This is sufficiently close that the Sun lies in its…
Early illustration showing how many of the stars in Ursa Major move in a group
Early illustration showing how many of the stars in Ursa Major move in a group