243 Ida
- A script has been used to generate a semi-automated review of the article for issues relating to grammar and house style; it can be found on the automated peer review page for March 2009.
This peer review discussion has been closed.
I've listed this article for peer review because it has recently undergone major improvements, and I would like to know if there are any remaining issues that need to be addressed before sending it to FAC.
Thanks, Wronkiew (talk) 04:09, 26 March 2009 (UTC)
Comments from Chzz
Requesting user stated intent to obtain FA, so I've been quite picky; as always, this is IMHO.
Over all, it looks like a good article, certainly with potential for FA.
I've made various minor changes made, per MOS etc; fixed up referencing tags and changed a covenience link; DABs; changed picture in infobox (got the original TIF (higher quality), and cropped some of the black out of the border); see diffs from Chzz dated 26 March 2009.
- The infobox has [[Dactyl (moon)|Dactyl]] which is a redirect to a section within the article; I'm not sure if that is recommended - but may become irrelevent because;
- The TOC is very long; WP:WIAFA - see Wikipedia:Summary style - I would suggest that the moon section be split off into a separate article. I think that there is enough material on the topic to start a new article, and that doing so would make this article more balanced.
- I disagree, not enough reference material on the moon exists to make it a standalone article. I combined some of the subsections to reduce the complexity of the TOC. Also, the prose size of the article is not outside the recommended bounds specified in WP:SIZE. Wronkiew (talk) 05:10, 28 March 2009 (UTC)
- I changed redlink reflection spectra to Stellar classification#Spectral types - Is that the best redirect for this link?
- No, I changed it back. Reflection spectra is the difference between the illumination spectra and the measured spectra. Stellar spectroscopy does not involve reflection. Wronkiew (talk) 05:10, 28 March 2009 (UTC)
- Fair enough, as long as you think that an article on the topic could be written (per WP:MOS#Red links) -- Chzz ► 20:22, 28 March 2009 (UTC)
- No, I changed it back. Reflection spectra is the difference between the illumination spectra and the measured spectra. Stellar spectroscopy does not involve reflection. Wronkiew (talk) 05:10, 28 March 2009 (UTC)
- Check image alignment (I haven't had time yet)
- Add more wikilinks - not many, for an article of this size
- Re. File:NWA869Meteorite.jpg - the previous (2nd) version looks sharper (especially in the reduced-size on the page); see here
- The animated gif may need further info to explain the rotation seen
- Re. File:Galileo trajectory Ida.svg - Confusing with "Earth" duplicated; not clear which dot refers to which Earth position; could it be clarified?
- I uploaded a new version with a single Earth label, although the thumbnail hasn't updated yet. Wronkiew (talk) 05:10, 28 March 2009 (UTC)
-This is very much a partial look through. I intend to look over the grammar more later. Thanks, -- Chzz ► 15:53, 26 March 2009 (UTC)
- I think it would be worth uploading and adding (a crop of) this image -- Chzz ► 19:24, 26 March 2009 (UTC)
- 2 facts in the lede but don't seem to be in the body:
- "a member of the Koronis family of main-belt asteroids."
- "It was the second asteroid to be visited by a spacecraft" - Gaspra is mentioned, but not the fact of first/second
- Para beginning "Ida's orbit around the Sun..." uses the word 'mass' too often
- "Discovery and observations" - prose needs work; awkward syntax. Also maybe too short as a section.
- Exploration/Galileo flyby - too many short choppy sentences
- Re. "A new NASA policy that encouraged outer Solar System missions to evaluate asteroid flybys led to the selection of these two asteroids as targets.
- I think this is wrong; they wouldn't evaluate the flyby, they would evaluate the asteroid.
- Also repetiton of 'asteroid' could perhaps be avoided. In fact, this whole section needs a bit of work on the prose - I've had a go just now, but it needs more.
- m/pixel maybe better written out as "megapixel", and wikilinked
Discoveries
- "possible compositions included" sounds odd to me; perhaps "theories" or "speculation" or somesuch. I sort-of understand, I suppose these compositions matched the profile of the spectrogaph? Maybe this could be elaborated upon.
- I've reworded this a bit.
- Is "stony-iron" another term from this field? Is it just Iron with a high stone content?
- weathering - "This superficial process" - I think it's not the process that is superficial, but its effect?
- "although Dactyl showed less of a change." - maybe "although Dactyl showed a lesser change."?
- Is it possible to explain the red colour? What causes it? Oxidation?
- "the reflection spectra of newer, unweathered parts" - I don't understand why parts are newer (and, later, older)
- "Both discoveries, the effects of space weathering on Ida and the measurement of its density, led to a new understanding" - I don't like the sentence structure; perhaps "Both of these discoveries - the space weathering effects and the low density - led to a new understanding..."
- "However, the reflection " - is it possible to reword this part to avoid starting a sentence with "However"?
- "The Galileo flyby of Ida found, for the first time, that some S-type asteroids, in particular those of the Koronis family, could be the source of these meteorites.[31]" - too many subclauses, hard to follow.
-- Chzz ► 00:01, 29 March 2009 (UTC)
- Mass, "A vehicle moving in excess of 20 m/s (40 mph) " - Why a vehicle? Maybe "An object" is better. Also seems like a mismatch of units; maybe the first should be kph. Perhaps "an object...would reach escape veloicy" - with a wikilink - would be better.
- Changed mph to ft/s, changed "vehicle" to "object" and I added a wikilink to escape velocity. Reyk YO! 22:37, 29 March 2009 (UTC)
- "unintuitive" - I think 'counterintuitive' might be a better word
- Shape - "the best-fit triaxial ellipsoid" - maybe "a best-fit..."; also perhaps wikilink triaxial
- The source says the best-fit and if my hazy memory of uni maths serves me correctly, I believe best-fit ellipsoids are uniquely determined. I agree with you in principle that triaxial should be wikilinked, but it's a redirect to ellipsoid, so that would be pointless. Reyk YO! 22:37, 29 March 2009 (UTC)
- Structures - "Region 2 contains nearly all of the large (>6 kilometres (3.7 mi)) ones but Region 1 has no large craters at all." - syntax of this is a bit odd; could it be reworded to avoid the double brackets, and the > abbreviation?
- Craters - perhaps swap the 2 paragraphs around so that names are explained before the named Choukoutien is mentioned
- "other Solar System " - I don't think this should be in initial capitals?
OK - I won't look at the 'moon' section in detail at this stage; as I said, I think it should probably be a separate article (With a 'see main article').
Also, I have not checked the references and wikilinks.
I hope this has proved constructive; overall, whilst I certainly think that it has the potential to become an FA, I would suggest getting as much more input as possible vith a view to improving the prose towards an 'excellent' level. Also - without researching it myself - I wonder about the overall bias towards information from Gallileo; I appreciate that much of our knowledge of the object must come from that image, but perhaps it would be possible to detail a little more on analysis that took place prior to the Gallileo missions.
Best of luck, -- Chzz ► 20:08, 29 March 2009 (UTC)
- Almost all the information we have about Ida came from the Galileo flyby. Considering how many asteroids exist in the Solar System and how few have been visited, it is highly unlikely that it will be studied at that level of depth for the forseeable future. Well, except for this plan to nuke it from orbit. Wronkiew (talk) 17:30, 1 April 2009 (UTC)
Comments from Ealdgyth (talk · contribs)
- You said you wanted to know what to work on before taking to FAC, so I looked at the sourcing and referencing with that in mind. I reviewed the article's sources as I would at FAC. The sourcing looks good.
- Hope this helps. Please note that I don't watchlist Peer Reviews I've done. If you have a question about something, you'll have to drop a note on my talk page to get my attention. (My watchlist is already WAY too long, adding peer reviews would make things much worse.) 13:51, 27 March 2009 (UTC)
comments from Serendipodous 14:03, 29 March 2009 (UTC)
- Sections should have introductory paragraphs. Either that, or remove the subsection headings.
- Explanatroy footnotes like those below should be included in a separate "Notes" section, using the Note_label format, not the references section.
- Traditionally for planet/minor planet articles, Orbit info goes at the top while exploration info goes at the bottom.
- The article mentions that Dactyl's surface gravity is known, which means its mass should be known as well, but there is no indication of what its mass is.
Comments from RJH (talk) 21:55, 9 April 2009 (UTC)
- There are some single paragraph sections that should perhaps be merged into other sections.
- "Although its orbital period of 4.84 years is longer than the Earth's, its rotation period of 4.63 hours is shorter." This comparison with the Earth seems odd. A comparison with a typical main belt asteroid's rotation period would be more useful.
- This is vague and applies to virtually all main belt asteroids: "its mass constitutes an insignificant fraction of the belt's total."
- "Its low density indicates that it is depleted of metallic minerals." Has porosity been ruled out?
- The article should explain the number 243.
- I don't think it's explicitly mentioned in the sources, but I have included a link to List of minor planets#Numbering_and_naming_conventions which explains asteroid numbering conventions in general. Reyk YO! 06:15, 11 April 2009 (UTC)
- "Ida's ... fast rotation, is responsible for the asteroid's highly uneven gravitational field." How is the rotation rate responsible for an uneven gravitational field?
- Is anything known about the precession of Ida?
Thank you.
Thank you everyone for your help improving the article. It certainly looks (and reads) a lot better than it did when we started this peer review. If no one has any additional comments in the next few days, we're going to take it over to FAC. Wronkiew (talk) 22:16, 12 April 2009 (UTC)
- Best of luck with that; if I can contribute to that process, give me a shout on my talk. Chzz ► 01:14, 14 April 2009 (UTC)
Closing the peer review, thanks again everyone! Wronkiew (talk) 01:22, 16 April 2009 (UTC)