Re: Converting proper motion



Yes! The numbers you usually see are fractions of a second of arc
and, as I remember, PER YEAR. Read the fine print to be sure!

Saul Levy


On 26 Sep 2005 13:27:00 -0700, "Axel Harvey" <axe@xxxxxxx> wrote:

>When a star's proper motion is expressed in rectangular coordinates,
>do x and y correspond to RA and declination? If not, where can I
>learn how to change mu_x, mu_y to mu_alpha, mu_delta?
.