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EUROPEAN SPACE AGENCY EUROPEAN SPACE OPERATIONS CENTRE GROUND SYSTEMS ENGINEERING DEPARTMENT Space Debris Office CLASSIFICATION OF GEOSYNCHRONOUS OBJECTS ISSUE 12 by R. Choc and R. Jehn Produced with the DISCOS Database February 2010 ESOC Robert-Bosch-Str. 5, 64293 Darmstadt, Germany 3 Abstract This is a status report on geosynchronous objects as of the end of 2009. Based on orbital data in ESA’s DISCOS database and on orbital data provided by KIAM the situation near the geostationary ring (here defined as orbits with mean motion between 0.9 and 1.1 revolutions per day, eccentricity smaller than 0.2 and inclination below 30 deg) is analysed. From 1161 objects for which orbital data are available, 391 are controlled inside their longitude slots, 594 are drifting above, below or through GEO, 169 are in a libration orbit and 7 whose status could not be determined. Furthermore, there are 77 uncontrolled objects without orbital data (of which 66 have not been catalogued). Thus the total number of known objects in the geostationary region is 1238. During 2009 twenty-one spacecraft reached end-of-life. Eleven of them were reorbited following the IADC recommendations, one spacecraft was reorbited with a perigee of 225 km - it is not yet clear if it will enter the 200-km protected zone around GEO or not -, six spacecraft were reorbited too low and three spacecraft did not or could not make any reorbiting manouevre at all and are now librating inside the geostationary ring. If you detect any error or if you have any comment or question please contact R¨udiger Jehn European Space Operations Center Robert-Bosch-Str. 5 64293 Darmstadt, Germany Tel.: +49-6151-902714 Fax.: +49-6151-902625 E-mail: [email protected] CONTENTS 4 Contents 1 Introduction 5 2 List of geosynchronous objects 6 3 Table 1: Objects with Two-Line-Element data 29 3.1 Satellites under longitude and inclination control (E-W and N-S control) .......... 30 3.2 Satellites under longitude control (only E-W control) ..................... 46 3.3Objectsinadriftorbit...................................... 52 3.4 Objects in a libration orbit around the Eastern stable point ................. 82 3.5 Objects in a libration orbit around the Western stable point ................. 89 3.6 Objects in a libration orbit around both stable points .................... 92 4 Table 2: Objects without Two-Line-Element data 98 4.1 Satellites under longitude and inclination control (E-W and N-S control) .......... 100 4.2 Satellites under longitude control (only E-W control) ..................... 101 4.3 Satellites under control ...................................... 103 4.4Objectsinadriftorbit...................................... 104 4.5 Objects in a libration orbit around the Eastern stable point ................. 110 4.6 Objects in a libration orbit around the Western stable point ................. 111 4.7 Objects in a libration orbit around both stable points .................... 111 4.8Unidentifiedobjects....................................... 112 4.9 Uncontrolled objects ....................................... 113 4.10 Uncontrolled uncatalogued objects ............................... 114 5 Table 3: objects of indeterminate status 116 6 Figures 119 7 Summary 126 8 References 127 9 Acknowledgements 127 1 INTRODUCTION 5 1 Introduction All objects near the geostationary ring which are catalogued in ESA’s DISCOS Database (Database and Information System Characterising Objects in Space) are listed in this document. The main purpose is to classify all these objects according to different categories. Indeed, six different types of categories are defined: • C1: objects under longitude and inclination control (E-W as well as N-S control) - the longitude is nearly constant and the inclination is smaller than 0.3 degrees, • C2: objects under longitude control (only E-W control) - the longitude is nearly constant but the inclination is higher than 0.3 degrees, • D: objects in a drift orbit, • L1: objects in a libration orbit around the Eastern stable point (longitude 75 degrees East), • L2: objects in a libration orbit around the Western stable point (longitude 105 degrees West), • L3: objects in a libration orbit around both stable points. All objects are selected from ESA’s DISCOS Database according to the following criteria: • eccentricity smaller than 0.2 • mean motion between 0.9 and 1.1 revolution per sidereal day, corresponding approximately to a semi-major axis between 42164-2500 and 42164+3150 km. • inclination lower than 30 degrees The basic source of information are the NASA Two-Line Elements (TLE). The DISCOS Database is updated at regular intervals by ESOC’s Space Debris Office (on average 1 TLE per week and per object is stored). As the data are determined by passive sensors, their accuracy is limited. At the geostationary altitude, only objects larger than about1minsizearetrackedonaregularbasis.Themain information given by this catalogue is the classification of the objects according to their type of motion. It should be noted that also some of the derived parameters like libration period and libration amplitude may sometimes have a limited accuracy. For further information about the method of classification please refer to Classification of geostationary objects, (Ref. 1). This document contains three tables: • Table 1 contains objects with recently updated orbital elements. They are ordered according to their type of motion and some orbital information is given. • Table 2 contains objects for which there were no TLEs available during the last 6 months. The orbital data is provided by Vladimir Agapov, Keldysh Institute for Applied Mathematics, Moscow (KIAM). • Table 3 contains all the objects the status of which cannot be determined by our software. The main reason for the difficulty to classify an object is that there are not enough TLEs available or that the status has recently changed (satellite newly launched or recently manoeuvred). In order to find a specific object in one of the three tables, there is a list of all objects in ascending order of their COSPAR identification in Chapter 2. 2 LIST OF GEOSYNCHRONOUS OBJECTS 6 2 List of geosynchronous objects All the catalogued objects near the geostationary ring are listed here. They are ordered according to their COSPAR designation. The status of these objects (controlled, drifting, libration), the table in which they are classified and a reference number are also given. Column 1: COSPAR designation. Column 2: Object’s common name. Column 3: Number of the Table in which the object is classified: • Table 1: objects with updated TLEs. • Table 2: objects with orbital data by KIAM or without any orbital data. • Table 3: status is indeterminate. Column 4: The status of the object: • C1: objects under longitude and inclination control (E-W as well as N-S control), • C2: objects under longitude control (only E-W control), • C: objects under control (source: KIAM - no TLEs available). • D: objects in a drift orbit, • L1: objects in a libration orbit around the Eastern stable point (longitude 75 degrees East), • L2: objects in a libration orbit around the Western stable point (longitude 105 degrees West), • L3: objects in a libration orbit around both stable points. • Ind: the status could not be determined. • U: uncontrolled objects (source: KIAM - no TLEs available). Column 5: A reference number to find the object in its table. Please note, that objects in tables 4.8 (Unidentified objects) and 4.10 (Uncontrolled uncatalogued objects) are not included in this list. 2 LIST OF GEOSYNCHRONOUS OBJECTS 7 COSPAR NAME TABLE STATUS No 64047A Syncom 3 1. D 376. 65028A Intelsat I F-1 1. L2 23. 66053A GGTS 1 1. D 491. 66053B IDCSP 1 1. D 489. 66053C IDCSP 2 1. D 487. 66053D IDCSP 3 1. D 484. 66053E IDCSP 4 1. D 481. 66053F IDCSP 5 1. D 478. 66053G IDCSP 6 1. D 475. 66053H IDCSP 7 1. D 473. 66053J Titan IIIC stage 3 (Transtage) 1. D 471. 66110A ATS 1 1. D 379. 67001A Intelsat II F-2 1. D 377. 67003A IDCSP 8 1. D 495. 67003B IDCSP 9 1. D 494. 67003C IDCSP 10 1. D 493. 67003D IDCSP 11 1. D 492. 67003E IDCSP 12 1. D 490. 67003F IDCSP 13 1. D 483. 67003G IDCSP 14 1. D 480. 67003H IDCSP 15 1. D 476. 67003J Titan IIIC stage 3 (Transtage) 2. U 1. 67026A Intelsat II F-3 1. L1 99. 67066A IDCSP 16 1. D 502. 67066B IDCSP 17 1. D 501. 67066C IDCSP 18 1. D 500. 67066D IDCSP 19 1. D 499. 67066E LES 5 1. D 498. 67066F DODGE 1 1. D 497. 67066G Titan IIIC stage 3 (Transtage) 1. D 496. 67094A Intelsat II F-4 1. L2 27. 67111A ATS 3 1. C2 58. 68050A OPS 9341 (IDSCS 20) 1. D 488. 68050B OPS 9342 (IDSCS 21) 1. D 486. 68050C OPS 9343 (IDSCS 22) 1. D 485. 68050D OPS 9344 (IDSCS 23) 1. D 482. 68050E OPS 9345 (IDSCS 24) 1. D 479. 68050F OPS 9346 (IDSCS 25) 1. D 477. 68050G OPS 9347 (IDSCS 26) 1. D 474. 68050H OPS 9348 (IDSCS 27) 1. D 472. 68050J Titan IIIC stage 3 (Transtage) 1. D 470. 68063A OPS 2222 (CANYON 1) 2. D1 66. 68063B Atlas SLV-3A stage 2 (Agena D) 2. D1 8. 68081A OV2 5 1. D 446. 68081C OV5 4 2. U 2. 68081D LES 6 1. L2 21. 68081E Titan IIIC stage 3 (Transtage) 1. D 444. 68081G LES 6 operational debris 1. D 420. 68081H LES 6 operational debris 1. D 449. 68081J Transtage 5 debris 1. D 412. 68081K Transtage 5 debris 1. D 453. 68081L Transtage 5 debris 1. D 450. 68081M Transtage 5 debris 1. D 405. 68081N Transtage 5 debris 1. D 414. 68081P Transtage 5 debris 1. D 440. 2 LIST OF GEOSYNCHRONOUS OBJECTS 8 COSPAR NAME TABLE STATUS No 68116A Intelsat III F-2 1. D 2.
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