<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">Hello<div><br></div><div><br></div><div>In the EPN-TAP interface to exoplanet.eu, we're using src.orbital.inclination for this angle.</div><div>- although intended for inclination of an orbit on the ecliptic (in the Solar System), the UCD refers to a generic orbital inclination and seems acceptable in this context.</div><div>This UCD is also used in ESAsky, which takes the values from <a href="http://exoplanet.eu">exoplanet.eu</a></div><div><br></div><div>Hope this helps</div><div><br></div><div><div><div dir="auto" style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div dir="auto" style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div style="orphans: 2; widows: 2; margin: 0px;"><font face="Helvetica" style="font-variant-ligatures: normal; font-variant-alternates: normal; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-position: normal; font-size: 12px; line-height: normal;">Stéphane Erard</font></div><div style="orphans: 2; widows: 2; margin: 0px;"><font face="Helvetica" style="font-variant-ligatures: normal; font-variant-alternates: normal; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-position: normal; font-size: 12px; line-height: normal;">____________________________________________</font></div><div style="orphans: 2; widows: 2; margin: 0px;"><font face="Helvetica" style="font-variant-ligatures: normal; font-variant-alternates: normal; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-position: normal; font-size: 12px; line-height: normal;">LIRA, Observatoire de Paris</font></div><div style="orphans: 2; widows: 2; margin: 0px;"><font face="Helvetica" style="font-variant-ligatures: normal; font-variant-alternates: normal; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-position: normal; font-size: 12px; line-height: normal;">5 place Jules Janssen </font><span class="Apple-style-span" style="font-size: 12px;">F-92195 Meudon cédex, France</span></div><div style="orphans: 2; widows: 2; margin: 0px;"><font face="Helvetica" style="font-variant-ligatures: normal; font-variant-alternates: normal; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-position: normal; font-size: 12px; line-height: normal;"><i>tel</i> : 33 1 45 07 78 19 </font><span class="Apple-style-span" style="font-size: 12px;"><i>fax</i> : 33 1 45 34 76 83</span></div><div style="orphans: 2; widows: 2; margin: 0px;"><font face="Helvetica" style="font-variant-ligatures: normal; font-variant-alternates: normal; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-position: normal; font-size: 12px; line-height: normal;"><i>e-mail : stephane.erard@obspm.fr</i></font></div><div><font face="Helvetica" style="font-variant-ligatures: normal; font-variant-alternates: normal; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-position: normal; font-size: 12px; line-height: normal;"><i><br></i></font></div></div></div></div><div><br><blockquote type="cite"><div>Le 20 mars 2025 à 21:41, Kelle Cruz via semantics <semantics@ivoa.net> a écrit :</div><br class="Apple-interchange-newline"><div><div dir="ltr"><div>Hi folks IVOA folks,</div><div><br></div><div>(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.)</div><div><br></div><div>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). </div><div><br></div><div>I don’t think it’s <font face="monospace">src.orbital.inclination</font>. But <font face="monospace">pos.posAng</font> feels wrong too. </div><div><br></div><div>Thanks for any advice.</div><div><br></div><div>Kelle</div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div><br></div><div>--</div><div>Kelle Cruz, PhD (she/her, they/them)</div><div><div>Assoc. Professor, Physics and Astronomy, Hunter College<br></div><div>CEO, ScienceBetter Consulting, LLC</div><div>CFO, <a href="http://shop.startorialist.com/" target="_blank">Startorialist, Inc.</a></div><div>Editor-in-Chief, <a href="http://astrobetter.com/" target="_blank">AstroBetter Blog and Wiki</a></div><div>Research Associate, American Museum of Natural History</div><div>Visiting Scholar, Flatiron Institute<br></div></div></div></div></div></div></div></div>
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