If Kapteyn's star has a parallax angle of 0.255 arcsec, a proper motion of 8.67 arcsecs per year and a radial velocity of +246 km/s, What is the star's tangential velocity?

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1s2s2p Share
Feb 1, 2018

Answer:

#v_t=183.0dot(3)km# #s^(-1)#

Explanation:

#v_t# is given by the formula: #v_t=(4.75mu)/p#, where:

  • #mu# = proper motion (arc seconds per year)
  • #p# = parallax (arc seconds)

#v_t=(4.75*8.67)/0.225=183.0333...=183.0dot(3)km# #s^(-1)#

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