{"action":"created","issue":{"url":"https://api.github.com/repos/Stellarium/stellarium/issues/405","repository_url":"https://api.github.com/repos/Stellarium/stellarium","labels_url":"https://api.github.com/repos/Stellarium/stellarium/issues/405/labels{/name}","comments_url":"https://api.github.com/repos/Stellarium/stellarium/issues/405/comments","events_url":"https://api.github.com/repos/Stellarium/stellarium/issues/405/events","html_url":"https://github.com/Stellarium/stellarium/issues/405","id":363861142,"node_id":"MDU6SXNzdWUzNjM4NjExNDI=","number":405,"title":"Geostationary objects are moving","user":{"login":"alex-w","id":88731,"node_id":"MDQ6VXNlcjg4NzMx","avatar_url":"https://avatars3.githubusercontent.com/u/88731?v=4","gravatar_id":"","url":"https://api.github.com/users/alex-w","html_url":"https://github.com/alex-w","followers_url":"https://api.github.com/users/alex-w/followers","following_url":"https://api.github.com/users/alex-w/following{/other_user}","gists_url":"https://api.github.com/users/alex-w/gists{/gist_id}","starred_url":"https://api.github.com/users/alex-w/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/alex-w/subscriptions","organizations_url":"https://api.github.com/users/alex-w/orgs","repos_url":"https://api.github.com/users/alex-w/repos","events_url":"https://api.github.com/users/alex-w/events{/privacy}","received_events_url":"https://api.github.com/users/alex-w/received_events","type":"User","site_admin":false},"labels":[{"id":776509648,"node_id":"MDU6TGFiZWw3NzY1MDk2NDg=","url":"https://api.github.com/repos/Stellarium/stellarium/labels/confirmed","name":"confirmed","color":"b60205","default":false},{"id":760747400,"node_id":"MDU6TGFiZWw3NjA3NDc0MDA=","url":"https://api.github.com/repos/Stellarium/stellarium/labels/wishlist","name":"wishlist","color":"5319e7","default":false}],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":2,"created_at":"2018-09-26T05:14:13Z","updated_at":"2018-10-09T15:47:15Z","closed_at":null,"author_association":"MEMBER","body":"_Original report by Detlev Hoffmann:_ https://bugs.launchpad.net/stellarium/+bug/951045\r\n\r\nI'm using stellarium since some days and it is really a good tool. I was using my home position looking to \"Sirius\" and wanted to fast forward the view to the next day \"=\".\r\nThe star it self moves (I assume) well over the sky.\r\n\r\nBut as I inkluded a view to the satelites, looking to the geostationary satelite \"ASTRA 1E\" i was wondering, why this object moves...\r\n\r\nIf you use \"=\" to fast forward the satelite escapes within some \"days\".\r\nIf you use the fast forward function it might take some \"days\" more but the satelitte moves also to the eastern border.\r\n\r\nMy logfile:\r\n```\r\n2012-03-09T19:41:35\r\nWindows 7\r\nCompiled with GCC 4.4.0\r\nQt runtime version: 4.7.4\r\nQt compilation version: 4.7.4\r\nAddressing mode: 32-bit\r\nTotal memory: 3877 MB (unreliable)\r\nTotal virtual memory: 2047 MB (unreliable)\r\nPhysical memory in use: 45%\r\nProcessor speed: 2634 MHz\r\nProcessor name: Intel(R) Core(TM) i5 CPU M 460 @ 2.53GHz\r\nProcessor speed: 2634 MHz\r\nProcessor name: Intel(R) Core(TM) i5 CPU M 460 @ 2.53GHz\r\nProcessor speed: 2634 MHz\r\nProcessor name: Intel(R) Core(TM) i5 CPU M 460 @ 2.53GHz\r\nProcessor speed: 2634 MHz\r\nProcessor name: Intel(R) Core(TM) i5 CPU M 460 @ 2.53GHz\r\nC:\\Program Files (x86)\\Stellarium\\stellarium.exe\r\n -------------------------------------------------------\r\n[ This is Stellarium 0.11.1 - http://www.stellarium.org ]\r\n[ Copyright (C) 2000-2011 Fabien Chereau et al ]\r\n -------------------------------------------------------\r\nWriting log file to: \"C:/Users/Detlev/AppData/Roaming/Stellarium/log.txt\"\r\nFile search paths:\r\n  0 . \"C:\\Users\\Detlev\\AppData\\Roaming\\Stellarium\"\r\n  1 . \".\"\r\nConfig file is: \"C:\\Users\\Detlev\\AppData\\Roaming\\Stellarium/config.ini\"\r\nOpenGL supported version: \"2.1.2\"\r\nQt GL paint engine is: \"OpenGL2\"\r\nCache directory is: \"C:\\Users\\Detlev\\AppData\\Local\\stellarium\\stellarium\\cache\"\r\nSky language is \"de\"\r\nApplication language is \"de\"\r\nLoading Solar System data ...\r\nLoaded 65 / 65 planet orbits from \"C:\\Users\\Detlev\\AppData\\Roaming\\Stellarium/data/ssystem.ini\"\r\nLoading star data ...\r\n\"Loading \"./stars/default/stars_0_0v0_1.cat\": 0_0v0_1; 5013\"\r\n\"Loading \"./stars/default/stars_1_0v0_1.cat\": 1_0v0_1; 21999\"\r\n\"Loading \"./stars/default/stars_2_0v0_1.cat\": 2_0v0_1; 151416\"\r\n\"Loading \"./stars/default/stars_3_1v0_0.cat\": 3_1v0_0; 434064\"\r\n\"Loading \"C:\\Users\\Detlev\\AppData\\Roaming\\Stellarium/stars/default/stars_4_1v0_0.cat\": 4_1v0_0; 1725497\"\r\n\"Loading \"C:\\Users\\Detlev\\AppData\\Roaming\\Stellarium/stars/default/stars_5_2v0_0.cat\": 5_2v0_0; 7669011\"\r\n\"Loading \"C:\\Users\\Detlev\\AppData\\Roaming\\Stellarium/stars/default/stars_6_2v0_0.cat\": 6_2v0_0; 26615233\"\r\n\"Loading \"C:\\Users\\Detlev\\AppData\\Roaming\\Stellarium/stars/default/stars_7_2v0_0.cat\": 7_2v0_0; 57826266\"\r\n\"Loading \"C:\\Users\\Detlev\\AppData\\Roaming\\Stellarium/stars/default/stars_8_2v0_0.cat\": 8_2v0_0; 116923084\"\r\nFinished loading star catalogue data, max_geodesic_level: 8\r\nnavigation/preset_sky_time is a double - treating as jday: 2.45151e+06\r\nLoaded 10051 NGC records\r\nLoading NGC name data ...\r\nLoaded 222 / 222 NGC name records successfully\r\nLoading star names from \"./skycultures/western/star_names.fab\"\r\nLoaded 230 / 230 common star names\r\nLoading star names from \"./stars/default/name.fab\"\r\nLoaded 3215 / 4359 scientific star names\r\nLoaded 88 / 88 constellation records successfully for culture \"western\"\r\nLoaded 85 / 85 constellation art records successfully for culture \"western\"\r\nLoaded 89 / 89 constellation names\r\nLoading constellation boundary data ...\r\nLoaded 782 constellation boundary segments\r\nCreating GUI ...\r\nLoaded plugin \"Oculars\" .\r\nOcular plugin - press Command-O to toggle eyepiece view mode. Press ALT-o for configuration.\r\nOculars::validateIniFile ocular.ini exists at: \"C:\\Users\\Detlev\\AppData\\Roaming\\Stellarium/modules/Oculars/ocular.ini\" . Checking version...\r\nOculars::validateIniFile found existing ini file version 2\r\nLoaded plugin \"Satellites\" .\r\nSatellites::getJsonFileVersion() version from file: \"0.6.4\"\r\nSatellites::init using satellite.json file: \"C:\\Users\\Detlev\\AppData\\Roaming\\Stellarium/modules/Satellites/satellites.json\"\r\nLoaded plugin \"SolarSystemEditor\" .\r\nUsing the ssystem.ini file that already exists in the user directory...\r\nLoaded plugin \"Supernovae\" .\r\nSupernovae::getJsonFileVersion() version from file: \"0.2.7\"\r\nSupernovae::init using supernovae.json file: \"C:\\Users\\Detlev\\AppData\\Roaming\\Stellarium/modules/Supernovae/supernovae.json\"\r\nLoaded plugin \"TimeZoneConfiguration\" .\r\n```"},"comment":{"url":"https://api.github.com/repos/Stellarium/stellarium/issues/comments/428245173","html_url":"https://github.com/Stellarium/stellarium/issues/405#issuecomment-428245173","issue_url":"https://api.github.com/repos/Stellarium/stellarium/issues/405","id":428245173,"node_id":"MDEyOklzc3VlQ29tbWVudDQyODI0NTE3Mw==","user":{"login":"CF20852","id":8538249,"node_id":"MDQ6VXNlcjg1MzgyNDk=","avatar_url":"https://avatars0.githubusercontent.com/u/8538249?v=4","gravatar_id":"","url":"https://api.github.com/users/CF20852","html_url":"https://github.com/CF20852","followers_url":"https://api.github.com/users/CF20852/followers","following_url":"https://api.github.com/users/CF20852/following{/other_user}","gists_url":"https://api.github.com/users/CF20852/gists{/gist_id}","starred_url":"https://api.github.com/users/CF20852/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/CF20852/subscriptions","organizations_url":"https://api.github.com/users/CF20852/orgs","repos_url":"https://api.github.com/users/CF20852/repos","events_url":"https://api.github.com/users/CF20852/events{/privacy}","received_events_url":"https://api.github.com/users/CF20852/received_events","type":"User","site_admin":false},"created_at":"2018-10-09T15:47:15Z","updated_at":"2018-10-09T15:47:15Z","author_association":"NONE","body":"I think you can only accurately depict the location of satellites retrospectively, by using a TLE file containing past data.  However, for GSO satellites in particular, even this won't be completely accurate all of the time unless JSpOC happens to observe a satellite during and immediately after a stationkeeping maneuver.  You cannot predict the location of most actively-managed satellites far (i.e. weeks or months) into the future using a current snapshot of the ephemeris data, because the TLE data available from Celestrak or Space-Track.org do not contain data regarding future (and unknown) stationkeeping maneuvers.  LEO satellites will be influenced by solar activity that affects the upper atmosphere, which is predictable to a certain degree, but not with complete accuracy and precision.  For example, I recall a conversation with a Planet Labs employee in which I was told that a particular solar event caused some of their Dove satellites (which do not have propulsion systems) to lose at least a few kilometers of altitude over a period of a day or so."}}
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