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Documentation: LEDA: parameter: v3k

Radial velocity (cz) with respect to the CMB: v3k

Finally, the radial velocity is also expressed in the reference frame of the Cosmic Background Radiation. This velocity is noted v3k. It is calculated from the heliocentric velocity v using the total solar motion of 360 km/s towards the direction defined by the B1950 equatorial coordinates B 11.25 H - 5.6 deg (Lubin & Villela 1986).

v3k = v + 360 cos(theta)

Where theta is:

cost(theta) = sin(de3k) sin (de1950) + cos (de3k) cos(de1950) cos(al3k - al1950)

Other velocities in the database are: vrad, vopt, v, vgsr, vlg, vvir.