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Classification of Geosynchronous Objects

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Classification of Geosynchronous Objects esoc European Space Operations Centre Robert-Bosch-Strasse 5 D-64293 Darmstadt Germany T +49 (0)6151 900 F +49 (0)6151 90495 www.esa.int CLASSIFICATION OF GEOSYNCHRONOUS OBJECTS Produced with the DISCOS Database Prepared by T. Flohrer Reference GEN-DB-LOG-00101-HSO-GR Issue 15 Revision 0 Date of Issue 25 February 2013 Status FINAL Document Type TN Distribution open European Space Agency Agence spatiale européenne Abstract This is a status report on geosynchronous objects as of the end of 2012. 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 70 deg) is analysed. From 1291 objects for which orbital data are available, 422 are controlled inside their longitude slots, 662 are drifting above, below or through GEO, 178 are in a libration orbit, 9 are in highly-inclined orbits and 20 , whose status could not be determined. Furthermore, there are 78 uncontrolled objects without or- bital data (of which 73 have not been catalogued). Thus the total number of known objects in the geostationary region is 1369 . During 2012 at least fourteen spacecraft reached end-of-life. Nine of them were reorbited following the IADC recommendations. Four spacecraft were reorbited too low. We identified one spacecraft that seems to be abandoned or could not make any reorbiting manouevre at all in 2012 and is now librating inside the geostationary ring. If you detect any error or if you have any comment or question please contact: Tim Flohrer, PhD European Space Agency European Space Operations Center Space Debris Office (HSO-GR) Robert-Bosch-Str. 5 64293 Darmstadt, Germany Tel.: +49-6151-903058 Fax.: +49-6151-902625 E-mail: tim.fl[email protected] Page 1 / 165 European Space Agency CLASSIFICATION OF GEOSYNCHRONOUS OBJECTS Agence spatiale européenne Date 25 February 2013 Issue 15 Rev 0 Table of contents 1 Introduction 3 2 List of geosynchronous objects 5 3 Table 1: Objects with Two-Line-Element data 34 3.1 Satellites under longitude and inclination control (E-W and N-S control) . 35 3.2 Satellites under longitude control (only E-W control) . 56 3.3 Objects in a drift orbit . 63 3.4 Objects in a libration orbit around the Eastern stable point . 104 3.5 Objects in a libration orbit around the Western stable point . 112 3.6 Objects in a libration orbit around both stable points . 115 4 Table 2: Objects without Two-Line-Element data 123 4.1 Satellites under longitude and inclination control (E-W and N-S control) . 126 4.2 Satellites under longitude control (only E-W control) . 127 4.3 Objects in a drift orbit . 131 4.4 Objects in a libration orbit around the Eastern stable point . 138 4.5 Objects in a libration orbit around the Western stable point . 139 4.6 Objects in a libration orbit around both stable points . 140 4.7 Satellites with indeterminate status . 141 4.8 Unidentified uncatalogued objects . 142 4.9 Uncontrolled uncatalogued objects . 143 4.10 Uncontrolled uncatalogued objects . 144 5 Table 3: Objects in highly inclined orbits 146 6 Table 4: Objects of indeterminate status 147 7 Figures 155 8 Summary 163 9 References 165 10 Acknowledgements 165 Page 2 / 165 European Space Agency CLASSIFICATION OF GEOSYNCHRONOUS OBJECTS Agence spatiale européenne Date 25 February 2013 Issue 15 Rev 0 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 pur- pose is to classify all these objects according to different categories. Indeed, seven 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, • I: objects in a highly inclined orbit (inclination larger than 25 degrees). 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 70 degrees The basic source of information are the USSTRATCOM Two-Line Elements (TLEs). 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). The accuracy of TLE is limited. At the geostationary altitude, only objects larger than about 1 m in size are tracked on a regular basis. The main 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 or- bital data is provided by Vladimir Agapov, Keldysh Institute for Applied Mathematics, Moscow (KIAM). • Table 3 contains all the objects in highly-inclined orbits. Page 3 / 165 European Space Agency CLASSIFICATION OF GEOSYNCHRONOUS OBJECTS Agence spatiale européenne Date 25 February 2013 Issue 15 Rev 0 • Table 4 contains all the objects of which the status 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 four tables, there is a list of all objects in ascending order of their COSPAR identifier in Chapter 2. Page 4 / 165 European Space Agency CLASSIFICATION OF GEOSYNCHRONOUS OBJECTS Agence spatiale européenne Date 25 February 2013 Issue 15 Rev 0 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: objects in highly inclined orbits, • Table 4: 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, • I: objects in highly-inclined orbits, • 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 ob- jects) are not included in this list. Page 5 / 165 European Space Agency CLASSIFICATION OF GEOSYNCHRONOUS OBJECTS Agence spatiale européenne Date 25 February 2013 Issue 15 Rev 0 COSPAR NAME TABLE STATUS No 63031A Syncom 2 4. I 1. 64047A Syncom 3 1. D 422. 65028A Intelsat I F-1 1. L2 25. 66053A GGTS 1 1. D 554. 66053B IDCSP 1 1. D 552. 66053C IDCSP 2 1. D 550. 66053D IDCSP 3 1. D 547. 66053E IDCSP 4 1. D 544. 66053F IDCSP 5 1. D 541. 66053G IDCSP 6 1. D 538. 66053H IDCSP 7 1. D 536. 66053J Titan IIIC stage 3 (Transtage) 1. D 534. 66110A ATS 1 1. D 425. 67001A Intelsat II F-2 1. D 423. 67003A IDCSP 8 1. D 558. 67003B IDCSP 9 1. D 557. 67003C IDCSP 10 1. D 556. 67003D IDCSP 11 1. D 555. 67003E IDCSP 12 1. D 553. 67003F IDCSP 13 1. D 546. 67003G IDCSP 14 1. D 543. 67003H IDCSP 15 1. D 539. 67026A Intelsat II F-3 1. L1 104. 67066A IDCSP 16 1. D 565. 67066B IDCSP 17 1. D 564. 67066C IDCSP 18 1. D 563. 67066D IDCSP 19 1. D 562. 67066E LES 5 1. D 561. 67066F DODGE 1 1. D 560. 67066G Titan IIIC stage 3 (Transtage) 1. D 559. 67094A Intelsat II F-4 1. L2 28. 67111A ATS 3 1. L2 5. 68050A OPS 9341 (IDSCS 20) 1. D 551. 68050B OPS 9342 (IDSCS 21) 1. D 549. 68050C OPS 9343 (IDSCS 22) 1.
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