Ursa Major Moving Group - Group Members

Group Members

Current criteria for membership in the moving group is based on the stars' motion in space. This motion can be determined from the proper motions and parallax (or distance) to the stars and radial velocities. The Hipparcos satellite has recently greatly improved both the proper motion and parallax estimates of nearby bright stars, refining the study of this and other moving groups .

Based on their distances (measured with Hipparcos) and apparent magnitude, the absolute magnitude can be used to estimate the age of the stars. The stars in the moving group appear to have a common age of about 500 million years.

Read more about this topic:  Ursa Major Moving Group

Famous quotes containing the words group and/or members:

    [The Republicans] offer ... a detailed agenda for national renewal.... [On] reducing illegitimacy ... the state will use ... funds for programs to reduce out-of-wedlock pregnancies, to promote adoption, to establish and operate children’s group homes, to establish and operate residential group homes for unwed mothers, or for any purpose the state deems appropriate. None of the taxpayer funds may be used for abortion services or abortion counseling.
    Newt Gingrich (b. 1943)

    I weep for the liberty of my country when I see at this early day of its “successful experiment” that corruption has been imputed to many members of the House of Representatives, and the rights of the people have been bartered for promises of office.
    Andrew Jackson (1767–1845)