[Data-modeling] Astronomy: Celestial Object modeling on Sandbox (Orbit & Discovery)

[Ed Laurent]

Looks great! I especially like how you modeled orbital relationships as a
CVT and allowed multiple values. You may eventually want to add start and
end dates but that probably won't be very important info for most natural
celestial objects. The big CVT is also pretty cramped in the view but that
probably won't be a problem as the UI evolves.

Are all the properties, especially the last three, appropriate for all
celestial objects (e.g., asteroids) or only those that are actively
radiative (e.g., stars)? When I looked up the last three I only found
references to stars and quasars. If not, maybe you could tack those onto a
generic type to describe celestial objects that emit radiation and co-type
it with some of the specific object types you proposed.

You might also want to start a new type for Hipparcos Catalog Number.
Entries in the Hipparcos
Catalog<http://heasarc.gsfc.nasa.gov/W3Browse/all/hipparcos.html>appear
to have additional properties that someone may eventually want to
model.

-Ed


On Sat, May 10, 2008 at 3:36 AM, Gordon Mackenzie <gordon at metaweb.com>
wrote:

> So in the midst of furious testing I cobbled together my exploration of
> adding discovery information and orbital information to the Celestial Object
> type (partially robbing the cradle of Exoplanet):
>
> http://sandbox.freebase.com/tools/schema/astronomy/celestial_object
>
> First example is Phobos:
>
> http://sandbox.freebase.com/view/guid/9202a8c04000641f80000000000672d0
>
> I know it could get quite more detailed with even more properties for the
> orbital CVT but it may be that there is too much already...We do link to the
> Wikipedia article that has a quite explicit info box (and we aren't out to
> replace/fully replicate WP either).
>
> I think I am leaning towards having the specific Mass/Radius/Gravity/Temp
> information for the more specific object types of Star, Planet, Dwarf
> Planet, Natural Satellite, Asteroid, and Comet. An example is the
> size-appropriate use of various Mass and Radius ratios against a particular
> solar system body; Stars mostly use M(solar), Jovian-sized objects use
> M(jupiter), and rocky objects often use M(earth).
>
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