NGC 6553

Rarity: Uncommon

A topic a little better known than average, read and translated beyond its own country.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

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What Wikipedia says

NGC 6553 is a globular cluster in the constellation Sagittarius. NGC 6553 has an apparent magnitude of about 8th magnitude with an apparent diameter of 8.2 arcminutes. Its Shapley–Sawyer Concentration Class is XI, meaning the star concentration is very loose even at the center; it has stars of magnitude 20 and dimmer.

Excerpt from the Wikipedia article “NGC 6553”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: en:NASA, en:STScI, en:WikiSky, Public domain, via Wikimedia Commons.