
This extension downloads current version of file data.json from JAXA servers.
This is the file used by realtime Hayabusa 2 simulator from JAXA itself, which shows many data but does not
show spacecraft altitude above Ryugu, which can be calculated from value ONC_A in that file as per following formula:
altitude [km] = 354 / sqrt(ONC_A)
This datum can be easily read in jQuery, but not directly from a web page due to cross-site script security settings, hence an extension is required:
$.getJSON('http://haya2now.jp/data/data.json', function(data) {
var ONC_A=data.status.spacecraft.ONC_A * 1.0;
var altitude = 1000 * 354/Math.sqrt(ONC_A); // meters
});
}
Hayabusa 2 is scheduled to lower its altitude down to around 50 meters from its "parking orbit" at 20 km to deliver the 4 rovers:
Hayabusa 2 will also perform touchdown rehearshals before the actual touchdowns to get some soil samples.
Schedule:
Touchdown 1 Rehearsal 1: 10-12 September 2018 Link
Minerva-II-1a deployement: 22 september 2018 (link)
Minerva-II-1b deployement: 22 september 2018 (link)
MASCOT (by CNES/DLR): 3 october 2018
Touchdown 1 rehearsal 2: Mid-October 2018
Touchdown 1: Late October 2018
Touchdown operation slot 2: February 2019
Crater generation operation: March-April 2019
Touchdown operation slot 3: April-May 2019
Minerva-II-2 deployement: July 2019
Official Hayabusa 2 site