Welcome to Yahoo Orbital Ephemeris group.



Please have a look at the links and files areas and feel free to add

your own contributions there. Remember that only 20MB of file space is

allowed per group, so where possible put a link to large files that are

already stored elsewhere.



A good place to start is JPL http://www.jpl.nasa.gov/ and especially the

Horizon page http://ssd.jpl.nasa.gov/?horizons_doc



regards

Ray

Frank J. Lucatelli wrote:

> The top 26 list of solar system objects by their mass:

> Compiled by Eric Schreur of the Kalamazoo Valley Museum

> ...



Hi Frank



I recommend the Horizons site at JPL. http://ssd.jpl.nasa.gov/?horizons

Some of the details are here for planets

http://ssd.jpl.nasa.gov/?planet_phys_par

and here for satellites http://ssd.jpl.nasa.gov/?sat_phys_par

for asteroids etc, start at http://ssd.jpl.nasa.gov/?sb_elem



It is quite amazing how accurately the masses of most bodies are now

known as

a result of fly-bys mostly, but also accurate ranging of bodies. For

example the time

for light to travel 1 AU is 499.004783806 (± 0.00000001) s which means

the AU

is now known to an accuracy of 3 m!



regards

Ray

Welcome to Yahoo Orbital Ephemeris group.



I am resending this message because I just found that 9 members were

"pending" and for a while I couldn't get in to approve them. Anyway we

have 11 members now so that is quite satisfactory.



Please have a look at the links and files areas and feel free to add

your own contributions there. Remember that only 20MB of file space is

allowed per group, so where possible put a link to large files that are

already stored elsewhere.



A good place to start is JPL http://www.jpl.nasa.gov/ and especially the

Horizon page http://ssd.jpl.nasa.gov/?horizons_doc



The members consist of both astronomical and astrological interests.

Because there is potential for conflict there, I ask members to keep

those issues out of this group as there are plenty of other places to

air those subjects. We have the common interest of accurate planetary

ephemeris calculations over various time scales.



regards

Ray