Natural satellites
- collected from https://ssd.jpl.nasa.gov/?sat_elem
- into a spreadsheet https://docs.google.com/spreadsheets/d/1WF_LQ4hVW67K3Xl9o3q-8gqI5yxQE-D6ee5Etjl1UhA/edit#gid=1509716839
- converted to json with http://www.convertcsv.com/csv-to-json.htm