Using data from Hipparcos is it possible to calculate Radial Velocity. If we take 19 Leonis as example, RV is -3.70. Is it calculated from Proper Motion? Can I ask that any formulas be done in long hand please, i.e. how you would enter it into a standard spreadsheet rather than with symbols etc.
http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=19+Leonis&submit=SIMBAD+search
Additionally
Took the advice and found CRVAD2.dat ( http://cdsarc.u-strasbg.fr/viz-bin/Cat?III/254 ). The following line comes from CRVAD2.dat file and when I looked up HipId 40829 which is below, the RV value is -3.70 which matches the link above.
9.790554129 11.56817726 0.8 0.1 11.06 1.00 -48.63 -3.39 1.24 0.69 6.709 6.436 0.005 0.005 0.007 D AY D A3n A 7 VN 48029 84722 948942 4 ABA -3.70 -9.99 B 9 1
If I look up Sirius (32349), it says the RV is -7.60 but when you look up Sirius at Simbad, it says -5.50 ( http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Sirius )
6.752569403 -16.71314306 1.2 0.1 379.20 1.58 -552.63 -1206.40 0.50 0.50 -1.430 -1.121 0.011 0.002 0.039 U OD A1V+A5wd A1V+A5wd 32349 48915 1447791 4 AB -7.60 -9.99 A 0 1
Whats the reason for the discrepancy, CRVAD2.dat is an old version like there's two Hip data files (97 and 07)?