ISIS Heliocentric Correction

[Andrew Smith]

I have been trying to eliminate all possible sources of error in my RV measurements and would like to be sure that ISIS does nothing to the object co-ordinates that it is given via SIMBAD. That is it does not adjust for precession or proper motion of the object. I know the shifts are small for small position changes but I like to make sure.

Thanks Andrew

[Christian Buil]

Andrew,

Enter the eq. 2000.0 coordinates. The precession is corrected internally. The proper motion adjustment is of your responsibility (very small effect).

All the best,

Christian