Talk:Ilmarë

Size estimates mismatch

OK so in the lede and the sidebar, it says 403km diameter (201.5km radius)...

But further down in the actual discussion of Ilmare's size, the estimates seem to be given as a range from 137 to 191km radius, with a same-albedo estimate of 163km meaning "it is likely to be within this range".

Obviously 201.5 isn't inside of 137 to 191km, so what's going on here? Which figures do we trust?

(...and why do WP minor planet articles keep being updated in this scattergun fashion where someone inserting figures in one part doesn't check to see if they make any sense vs those stated in another that can be made visible on the same screen even on a relatively low resolution device? Or even that they're using the same convention in terms of radius vs diameter, so not confusing the casual reader even further?) 2A00:23C8:9C94:DD01:B981:AA68:3FCF:675 (talk) 18:59, 16 August 2025 (UTC)

Keith Noll

Guys Can I remove the red link of Keith Noll? No one has created a page for him so Linking him is unnecessary My planet is Homlos (talk) 07:35, 27 September 2025 (UTC)

See WP:REDYES for why redlinks might be useful. The guideline at WP:NPROF establishes when an academic is notable enough to have a Wikipedia article. Keith Noll meets those critieria (specifically the first one). There is currently a draft article Draft:Keith S. Noll. Renerpho (talk) 10:24, 27 September 2025 (UTC)

@My planet is Homlos: I've finished up the draft and moved it to WP:MAINSPACE. The red link is no longer red. Next time you see a red link that bothers you, consider writing the article yourself! Renerpho (talk) 14:39, 27 September 2025 (UTC)

I had previously removed the red link to Reiner Stoss on the Sedna article because I thought he wasn't notable enough to warrant a Wikipedia article. Turns out he does have pages in four other languages. I had also mistakenly removed the red links to a few other people on other TNO articles, including Keith Noll, so there's that. Thirtyfourninety (talk) 14:42, 27 September 2025 (UTC)

@Thirtyfourninety: Not all red links are good, and sometimes removing them is correct. Reiner Stoss doesn't meet the notability standards of the English Wikipedia (compare Special:Diff/1313258925 for one way to resolve red links in such cases), but Noll does, and so do quite a few other planetary scientists who don't have an article yet. Renerpho (talk) 15:07, 27 September 2025 (UTC) Striking part of the comment that is no longer good advice, following Wikipedia:Articles for deletion/List of minor planet discoverers. Renerpho (talk) 23:22, 5 December 2025 (UTC)

Absolute magnitude

@Thirtyfourninety and My planet is Homlos: The absolute magnitude 3.097±0.060, which had been added to the article in October 2019, comes from Grundy et al. 2015, page 6. That source gives a brightness difference of 1.7 mag between Varda and Ilmarë, and an absolute magnitude 3.1 mag for the entire system. There is no reason why the infobox for Ilmarë should give the absolute magnitude of the Varda+Ilmarë system. That belongs into the 174567 Varda article (and indeed, the number is given in the infobox there).

No absolute magnitudes for the individual components is given. However, we can approximate it from the size and albedo: With D=403 km and an albedo of p=0.068, the absolute magnitude should be around $5\log _{10}{\frac {1329}{D{\sqrt {p}}}}$, which is 5.5 mag. And indeed, that is consistent with the absolute magnitude of 3.81±0.01 given for the primary in 174567 Varda (from Suomi et al. 2020), together with the difference of 1.7 mag for the components (from Grundy et al. 2015).

Unfortunately, since the two numbers come from different sources, combining them would be WP:SYNTH, and I think it's best to leave the absolute magnitude (H~5.5 mag) of Ilmarë out of the infobox -- until we find a source that actually provides it. Renerpho (talk) 23:11, 5 December 2025 (UTC)

Or can I do "Varda+1.7" in absolute magnitude infobox? I saw the Tinia article and the apparent magnitude is"Uni+2.5", or should we just let the viewers figure it out themselves, to avoid synth so I can't add Varda+1.7, I think that might be the safest way. Homlos (MPIH) (talk) My planet is Homlos (talk) 01:27, 6 December 2025 (UTC)

@My planet is Homlos: That works, yes. I've added it, with the appropriate source. A reference is missing in Tinia (moon) -- I'll take care of that as well. Renerpho (talk) 06:53, 6 December 2025 (UTC)

I've changed them both to absolute magnitude (both here, and in the Tinia article). The sources express this as a difference in H. Renerpho (talk) 06:59, 6 December 2025 (UTC)