###Icons
| Name | Size |
|---|---|
| iphone_2x | 120x120 |
| iphone_3x | 180x180 |
| ipad | 76x76 |
| ipad_2x | 152x152 |
| android_ldpi | 36x36 |
| android_mdpi | 48x48 |
| android_hdpi | 72x72 |
| android_xhdpi | 96x96 |
###Launch Screens
| Name | Size |
|---|---|
| iphone_2x | 640x960 |
| iphone5 | 640x1136 |
| iphone6 | 750x1334 |
| iphone6p_portrait | 1242x2208 |
| iphone6p_landscape | 2208x1242 |
| ipad_portrait | 768x1024 |
| ipad_portrait_2x | 1536x2048 |
| ipad_landscape | 1024x768 |
| ipad_landscape_2x | 2048x1536 |
| android_ldpi_portrait | 200x320 |
| android_ldpi_landscape | 320x200 |
| android_mdpi_portrait | 320x480 |
| android_mdpi_landscape | 480x320 |
| android_hdpi_portrait | 480x800 |
| android_hdpi_landscape | 800x480 |
| android_xhdpi_portrait | 720x1280 |
| android_xhdpi_landscape | 1280x720 |
###Other
| Name | Size |
|---|---|
| App Store | 1024x1024 |
From Meteor docs, Apple docs, Android icon docs and Android splash stackoverflow.
For those checking in on this, I'd suggest that you trust nothing but source code. The file dictating acceptable icon/splashScreen values is meteor/tools/cordova/builder.js (as of this writing).
In my present and your past, the latest "stable" version is 1.5.2.2. That file seems to completely omit the App Store icon size:
https://github.com/meteor/meteor/blob/release-1.5.2.2/tools/cordova/builder.js
In the future it looks like the list will be more production worthy. This is the latest version in the "devel" branch (probably inaccessible to your project unless you install a later version of Meteor):
https://github.com/meteor/meteor/blob/devel/tools/cordova/builder.js
Rather than subject my whole project to a development version of a system which is far too dynamic to be predictable, I'm just going to drag-and-drop the proper icons into Xcode directly when I submit to the app store. This tutorial seems to have accurate information about how to do it as of now, but it ironically seems to be missing some images: https://www.appsfoundation.com/post/how-to-change-app-icon