A little tweet to mark the occasion: https://twitter.com/EvoMRI/status/1019125277841117184 .

I wrote the above lines from Johannesburg, which is where Barack Obama gave the Mandela Centennial lecture today. Some pointers in https://twitter.com/Wikimania/status/1019290473188511744 .

I had thought about starting a Wikipedia article today in honour of my grandmother, and it ended up being about S/2016 J 2, a Jupiter moon, whose discovery was announced today along with that of 9 others: https://www.theverge.com/2018/7/17/17577784/jupiter-moons-carnegie-science-blanco-telescope-valetudo .

All 10 of them are now both on the English Wikipedia and on Wikidata, albeit with very rudimentary information.

There is a French version of those Wikipedia stub articles too, e.g. https://fr.wikipedia.org/wiki/S/2016_J_2 .

Meanwhile, waves of tweets on Mandela are being posted, e.g. https://twitter.com/hashtag/Madiba?src=hash .

I also looked at Mandela's Scholia profile:
https://tools.wmflabs.org/scholia/author/Q8023 . Not very useful (not surprising, since he was not an academic) but not completely off the mark either.

I took a first look at things named after him: https://twitter.com/EvoMRI/status/1019379972438396933 .

Turns out Estonia celebrated its centenary as well on July 17: https://www.ev100.ee/en .

Closing this with a Wikidata query for publications by people named Anna:

SELECT ?publication ?publicationLabel ?author ?authorLabel WHERE {
  ?publication wdt:P50 ?author .
  ?author wdt:P21 wd:Q6581072 ; wdt:P735 wd:Q666578 .
  SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],de,pl,cs,en,fr,nl,ru,sv,it,eo,ca". }
}

Made some more edits to

• https://en.wikipedia.org/wiki/Valetudo_(moon)
• https://commons.wikimedia.org/wiki/File:Valetudo_moon_of_Jupiter.jpg
• https://de.wikipedia.org/wiki/Valetudo_(Mond)
  today.