Talk:Hydra (moon)/GA1

GA Review

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Reviewer: Jens Lallensack (talk · contribs) 14:59, 17 March 2019 (UTC)

Reading now. --Jens Lallensack (talk) 14:59, 17 March 2019 (UTC)

• Hydra has a highly reflective surface caused by the presence of water ice. – Highly reflective compared to other plutonian moons? Otherwise, I would add "similar to other plutonian moons".
• Compared to the reflectivities of Pluto and Charon, Hydra's reflectivity is intermediate, in between those of Pluto and Charon. – Last part of the sentence is repetitive.
• The New Horizons team had suspected that Pluto might be accompanied with other moons – I would specify which moons were known at that point. Moons other than Charon?
• accompanied with – "accompanied by" seems to be more standard
• as "P1" and "P2", respectively by the discovery team – would add comma after "respectively"
• similarly to how the Moon was thought to have formed from debris ejected by a large collision of Earth – this means the moon is no longer thought to be formed this way?
• Link/explain "tidal evolution", "neutral spectrum", "downlinked"
• In this case, Hydra along with the smaller moons of Pluto had migrated outwards with Charon into their current orbits around the Pluto-Charon barycenter. – "would have migrated"?
• Hydra was thought to have formed from two smaller objects merging into one single object. – Again "was thought", so this is no longer the case?
• and its shortest axis 30.9 km (19.2 mi) across – some verb missing?
• The surface spectrum of Hydra is slightly bluish compared to the neutral surface spectrum of Nix – somewhat repetitive.
• Hydra is the outermost moon of Pluto, orbiting beyond Kerberos. Similarly to all of Pluto's moons, Hydra's orbit is nearly circular and is coplanar to Charon's orbit; all of Pluto's moons have very low orbital inclinations to Pluto's equator. – needs source.
• As a result of this "Laplace-like" 3-body resonance, it has conjunctions with Styx and Nix in a 5:3 ratio. – needs source.
• with a timing discrepancy of 0.3%. A hypothesis explaining the near-resonance suggests that the resonance originated before the outward migration of Charon after the formation of all five known moons, and is maintained by the periodic local fluctuation of 5% in the Pluto–Charon gravitational field strength.[notes 1] – needs source.
• Hydra's surface composition, reflectivity, and other basic physical properties were later performed by New Horizons during the flyby. – needs source
• Derived from those images, Hydra was given the approximate size estimate of 55 km × 40 km (34 mi × 25 mi). – needs source.
• Hydra's surface composition, reflectivity, and other basic physical properties were later performed – maybe "measured" instead of "performed"?
• That's all. It seems you are through now with Pluto's moons? Congrats. --Jens Lallensack (talk) 15:25, 17 March 2019 (UTC)

All done. Nrco0e (talk) 18:20, 17 March 2019 (UTC)

@Nrco0e: Thanks, promoting now. I may have little time during the next weeks, but hopefully others will pick up your other two articles you listed (our problem is a chonic lack of reviewers). In any case, if you see an article by another author listed at GAN that interests you then please feel free to contribute a review, you have more than enough experience for doing this. --Jens Lallensack (talk) 20:01, 18 March 2019 (UTC)