Talk:Metis (moon)

Untitled

Looks like the adj. form should be Metidian, but needs confirmation. kwami 2005 June 29 23:53 (UTC)

Bosnian wikipedia just added it as Metida. kwami 05:54, 15 April 2006 (UTC)

Mean Radius (Orbital) and Average Distance

Great work on all these Jupiter moons. There are so many but the authors have done a great job keeping up with the latest details. Thank you! Just one question. Many of the satellite pages indicate Mean Radius or Average Distance when indicating orbital parameters. The Mean Radius or Average Distance is different from an orbit's Semi-Major Axis. What is the intent? Thanks. Tesseract501 01 June 2006.

I don't know the intent (may be for simplicity for laymen?) but mean radius is used more often than semi-major axis. I usually consider them equivalent. In fact, mean radius lacks clear definition. For instance if you consider mean potential energy it is proportional to 1/a. So in some sense semi-major asis is a mean radius. Ruslik 13:58, 29 May 2007 (UTC)

The mean radius is what is usually given for inner moons of the giant planets because their osculating semi-major axes change in complicated ways on short timescales (days, months) due to the perturbations of all the other much larger satellites around the place. The advantage of giving a mean radius is that it is a value for the size of the orbit that can be both precise and accurate without the need to specify an exact date. Deuar 23:43, 16 June 2007 (UTC)

Passive voice and the use of Metidian

On second thought, the odd passive voice phrasing was not directly linked to use of the adjectival form, Metidian. Still I will not replace Metidian. Its is good enough. User:Fartherred from 207.224.85.91 (talk) 22:25, 20 June 2011 (UTC)

An alternative to Metidian is Metis' or Metis's. Of two possible spellings, both are used in two instances in the article. I will add another instance of Metis' making it the majority form and establish consistency for the article. I hope this is not too fastidious. Fartherred (talk) 17:13, 9 August 2011 (UTC)

Calculation of the Percentage of Jupiter's Surface That is Visible From Metis

The article states that "only 31% of Jupiter's surface is visible from Metis at any one time". As I worked through the math, I believe that this calculation is in error. I believe the error is because the spherical cap area was calculated using 2x the correct angle. Could someone double check that figure? There was no reference given. I was able to duplicate the viewing angle of 67.9°.blacksheep (talk) 01:26, 30 August 2016 (UTC)

The angle shouldn't come into the equation at all; it's entirely based on how far away an object is from a sphere. The equation is $f=\frac{d}{2(R+d)}$, which by my reckoning gives the correct value. However, with no references this becomes trivia/OR, so unless a source appears I'm going to simply remove the information (edit: this diff). I'll also ping WP:AST and WP:ASTRO for their input. Primefac (talk) 02:15, 30 August 2016 (UTC)

Since you have deleted the numbers, my response is a bit academic. The formula you cite is correct if the d is the distance of eye from the surface. If d is the orbital radius, the correct formula is $f=\frac{d-R}{2d}$. I believe you used the correct formula with the wrong number for d. This gave you the original viewable area value of 32%, which I believe to be in error. I calculate 22%. Please see this web page as a reference for this calculation. It also includes a calculator for checking your computation. blacksheep (talk) 20:56, 31 August 2016 (UTC)

Spoken Word Article

Hi everyone, I added a spoken word version of this article. Please let me know if I made any errors or mispronunciations. Thank you! — Preceding unsigned comment added by TheFugeni (talk • contribs) 22:19, 17 January 2021 (UTC)