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Should this be called a binary asteroid? The link defines a binary asteroid as one where the two objects orbit their common center of gravity, presumably this designation is the same as that for binary planets, when that center of gravity exists outside the body of the largest object (as is supposedly the case with Pluto and Charon.) If this is the case, then Ida and Dactyl would not be a binary asteroid as Dactyle is very small and the center of gravity in the Ida/Dactyle system is almost certainly within the body of Ida. In fact, references to Ida/Dactyl in other wikipedia articles list it as the first asteroid found to have a moon, rather than a binary asteroid - and in those articles about Ida, the link to asteroids with moons goes to a page describing those rather than to the binary asteroid description page.
I am not changing this because I personally do not know if in fact the center of gravity is within the body of Ida or not, but if someone else does and it indeed is, then this should be changed. Jafafa Hots 04:52, 18 January 2006 (UTC)
where is this asteroid located in the solar system? —Preceding unsigned comment added by 68.36.202.128 (talk) 16:57, 3 May 2008 (UTC)
The infobox lacks this, although there is a number of absolute magnitude which is unreferenced. Pomona17 (talk) 15:58, 5 August 2008 (UTC)
GA review – see WP:WIAGA for criteria
Very detailed. Could make its way into FA very shortly.
OhanaUnitedTalk page 02:53, 13 March 2009 (UTC)
What is meant when it is stated that Dactyl is 20 times smaller than Ida. The diameter is significantly less than one twentieth. Is is referring to mass? Maybe this should be stated.
N.B. if Dactyl is a twentieth of the mass then is a lot denser than Ida. Yaris678 (talk) 11:57, 29 July 2009 (UTC)
In the article, the average orbital speed is said to be 0.2036°/s, and in the body of the article, the orbital period is listed as 4.84 years. My back-of-the-envelope reckoning makes me thing that the average orbital speed should be 0.2036°/d, however I'm no astrophysicist, so I don't want to make the change without someone else verifying my math. Croquesaveur (talk) 21:15, 29 July 2009 (UTC)
http://news.yahoo.com/nphotos/Most-Emailed-Photos/ss/1756;_ylt=AvenoyFpnnWAM2gDdnYbmB3mWMcF#photoViewer=/091230/photos_sc_afp/d1f1bf032c1d3093992fbdd542a7001a —Preceding unsigned comment added by 69.76.233.12 (talk) 21:35, 5 January 2010 (UTC)
According Wanglesa some Dactyl craters in catena have been caused by debris from Ida, but this does not seem to be the case, then these catenae might be find in other points of the solar system, and therefore we can not attribute a common origin or similar. A possible explanation of catenae my be a meteor shower, which seem to have a common point of origin in heaven because its continu parallel trajectories. Coronellian (talk) 15:54, 20 June 2010 (UTC)
Why º/d ? In any other planet/moon/asteroid article, the average orbital speed is specified in km/s, why this one doesn't? — Preceding unsigned comment added by 81.184.198.58 (talk) 23:44, 6 September 2015 (UTC)
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I haven't tried to dig into the astronomy of Dactyl, but it would seem to me that instead of 'moon' this fractisimal object would be part of a joint-system mono identifier? Or is 'moon' just the off-hand way it is referred to. It's a spec of dust in comparison. :-) 50.111.29.1 (talk) 00:39, 28 August 2022 (UTC)
33 feet per second is only 22.5 miles per hour. That is only 1/4 the speed of a baseball pitch (21% of Bob Feller). So the word "thrown" should probably be changed to "tossed". agb 143.43.158.178 (talk) 16:17, 24 October 2023 (UTC)