Non-sky MOCs

[ada nebot]

Hi Mark, 

Thanks for your comment and spotting that! I agree with relaxing the language following your suggestion. 

Cheers,
Ada
 
--
Astronome Adjointe
CDS, Observatoire Astronomique de Strasbourg (ObAS)
UMR 7550 Université de Strasbourg 
11, rue de l'Université, F-67000 Strasbourg
+33 (0) 3 68 85 24 20

> On 12 Mar 2021, at 15:14, Mark Taylor <m.b.taylor at bristol.ac.uk> wrote:
> 
> Pierre, Ada and MOC authors,
> 
> the VODataService 1.2 PR
> (https://wiki.ivoa.net/twiki/bin/view/IVOA/VODataServiceV12RFC)
> is planning to permit use of MOCs for coverage information,
> and currently contains the text:
> 
>   "By default, the MOCs are to be interpreted in the ICRS. 
>    Future extensions to non-celestial frames (e.g., on planet surfaces) 
>    will use the frame attribute. However, the only celestial reference 
>    system allowed is ICRS."
> 
> I don't think that this conflicts with the spirit of the MOC text
> (no galactic/ecliptic sky coordinate systems allowed), but the 
> existing MOC 2.0 draft currently has language like:
> 
>    Consequently, the SMOC MUST be based on the HEALPix tessellation
>    of the sphere, expressed in the ICRS coordinate reference system.
> 
> which appears to exclude the possibility of using MOC with any non-sky
> coordinate system.
> 
> Could we consider relaxing the language to make it clear that MOC
> use on the sky is required to use ICRS, but future applications to
> non-sky domains are not prohibited?
> 
> Mark
> 
> --
> Mark Taylor  Astronomical Programmer  Physics, Bristol University, UK
> m.b.taylor at bristol.ac.uk          http://www.star.bristol.ac.uk/~mbt/

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