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Homework Help: Radial velocity

  1. Sep 3, 2014 #1
    1. The problem statement, all variables and given/known data

    The precision in measurements of radial velocities by the Doppler effect is currently 1 m/s.
    Can a Jupiter like planet orbiting a star similar to the Sun at a distance from the mother star equal to the Sun-Jupiter distance be detected?'
    (Use www or other sources to find the mass of Jupiter, the Sun and the distance between the two which are the only data you are allowed to use).

    Ms = 1.989*10^30 kg
    Mj = 1.898*10^27 kg
    d = 778500000 km

    2. Relevant equations
    |vr|= v sin(i), where
    vr is the radial velocity
    v is the real velocity
    and i is the inclination of the orbit.

    a*/ap = v*/vp = v*r/vpr
    where a* and ap are the semimajor axis of the sun and the planet.

    Kepler's 3. low can maybe be usefull.

    3. The attempt at a solution
    Last edited: Sep 3, 2014
  2. jcsd
  3. Sep 3, 2014 #2


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    Science Advisor
    Homework Helper
    2017 Award

    Hello ad and welcome to PF.
    Did you notice PF requires the use of the template (which somehow you circumvaded) ? Ýou got as far as point 1. Now 2 and 3, please !
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