Question about inclination angle UCD

[Molinaro, Marco]

Hi Kelle,

slack is quite "unofficial" while mailing lists should be
the formal communications channels for IVOA matters.

Semantics (the WG mailing list) and UCD-Sci (the "internal"
mailing list for UCD management are for sure the right ones
for your questions.

I wouldn't be surprised if it turns out that also Data Model
(dm@) will be called in, because you are asking something that
is finer grained than the UCD spectrum (my view, I leave it to
semantics gurus a proper answer).

I'm interested in this discussion because v.sin(i) is also
used as a relevant metadata piece in exoplanets orbits.

I wonder if the missing part is not the "angle" per sè but
the "source" descriptor to attach to.

Cheers
    Marco

Il giorno ven 21 mar 2025 alle ore 11:08 Kelle Cruz via semantics <
semantics at ivoa.net> ha scritto:

> Hi folks IVOA folks,
>
> (I posted this question in Slack but didn't get a response. I found these
> email addresses on the wiki and am giving them a try. If there's a better
> place for discussion, please let me know.)
>
> What’s the best UCD to use for the inclination angle of a star? That is,
> the angle of the star’s rotation axis w.r.t. us. Also known as “viewing
> angle” or the i in vsin(i).
>
> I don’t think it’s src.orbital.inclination.  But pos.posAng feels wrong
> too.
>
> Thanks for any advice.
>
> Kelle
>
> --
> Kelle Cruz, PhD (she/her, they/them)
> Assoc. Professor, Physics and Astronomy, Hunter College
> CEO, ScienceBetter Consulting, LLC
> CFO, Startorialist, Inc. <http://shop.startorialist.com>
> Editor-in-Chief, AstroBetter Blog and Wiki <http://astrobetter.com>
> Research Associate, American Museum of Natural History
> Visiting Scholar, Flatiron Institute
>


-- 
Marco Molinaro
INAF - Istituto Nazionale di AstroFisica
Osservatorio Astronomico di Trieste
email marco.molinaro at inaf.it
tel. [+39] 333 33 20 564 [also Telegram]
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