Time series data in VOEvent

[Frederic V. Hessman]

On 12 Jun 2007, at 3:49 pm, Steve Allen wrote:

> On Tue 2007-06-12T11:24:58 +0200, Frederic V. Hessman hath writ:
>> Unfortuately, UCD1+ doesn't (yet) have "time.julian" or
>> "heliocentric" atoms
>
> UCD1+ has time.scale

time.scale = "timescale", i.e. the temporal scale of something, and  
not a time system.

> Please don't use adjectives "heliocentric" or HJD anymore.
> Everything IAU-approved is currently "barycentric".

It may be "IAU-approved", but "barycentric" is not unambiguous: a  
"barycenter" is simply w.r.t. SOME (but not any particular) center-of- 
mass, so if you want the Solar System we'll have to come up with  
something like

	ucd="time.julian;time.barycentric;SolarSystem"

(note that NONE of these are UCD1+).   The IAU may not used "HJD"  
anymore, but I know zillions of astronomers who do ;-)

Rick


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Dr. Frederic V. Hessman     Hessman at Astro.physik.Uni-Goettingen.DE
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