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Orbits


Tyneside, UK
2021 Apr 11
Sunday, Day 101

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Primary source of unclassified orbital elements

Orbital elements based on amateur observations
Sun-synchronous Satellites by LTDN - United States

This a list of satellites in sun-synchronous orbit operated by the USA ordered by LTDN - Local Time at the Descending Node. Names are not necessarily those by which they are known in the NORAD catalogue used by SpaceTrack.

It is a snapshot and is updated daily. The measure that results in an entry in this table is that the drift rate of LTDN (Local Time at the Descending Node) is no more than twenty four minutes each year. Some satellites may have higher drift rates but they may still be acceptable to their owners/operators. They do not appear here. On the converse, although a satellite is in a sun-synchronous orbit, it is not necessarily active.


LTDN Satellite Cat
no
Desig- nation Orbit
Epoch
Orbit
00:44ESSA 220911966-016A2021 Feb 221355 x 1414 km, 113.4 min, 101°.2
00:59Amsat Echo (AO-51)283752004-025K2021 Feb 22693 x 811 km, 99.9 min, 98°.5
01:24Suomi NPP (Suomi National Polar-orbiting Partnership)378492011-061A2021 Feb 22826 x 827 km, 101.4 min, 98°.7
01:25NOAA 20 (JPSS 1)430132017-073A2021 Feb 22826 x 828 km, 101.4 min, 98°.7
01:35Aqua (EOS PM-1)274242002-022A2021 Feb 22702 x 703 km, 98.8 min, 98°.2
01:36OCO 2 (Orbiting Carbon Observatory)400592014-035A2021 Feb 22702 x 703 km, 98.8 min, 98°.2
01:36WestPac253981998-043E2021 Feb 22814 x 817 km, 101.2 min, 98°.8
01:44Aura (EOS Chem-1)283762004-026A2021 Feb 22702 x 703 km, 98.8 min, 98°.2
01:45Fedsat275982002-056B2021 Feb 22790 x 802 km, 100.8 min, 98°.6
01:53NOAA 17 (NOAA M)274532002-032A2021 Feb 22800 x 816 km, 101.0 min, 98°.6
02:13Calipso (Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations)291082006-016B2021 Feb 22684 x 686 km, 98.5 min, 98°.3
02:14Cloudsat291072006-016A2021 Feb 22685 x 686 km, 98.5 min, 98°.3
02:34Oscar 8 (AO-8)107031978-026B2021 Feb 22892 x 900 km, 102.9 min, 99°.1
03:21NOAA 5 (ITOS H)90571976-077A2021 Feb 221508 x 1524 km, 116.3 min, 102°.0
03:41NOAA 4 (ITOS G)75291974-089A2021 Feb 221444 x 1458 km, 114.9 min, 101°.8
03:42Oscar 7 (AO-7)75301974-089B2021 Feb 221440 x 1459 km, 114.9 min, 101°.8
03:45NOAA 2 (ITOS D)62351972-082A2021 Feb 221448 x 1454 km, 114.9 min, 101°.9
04:21USA 172 (DMSP 5D-3 F-16)280542003-048A2021 Feb 22842 x 852 km, 101.9 min, 98°.9
04:34USA 210 (DMSP 5D-3 F-18)359512009-057A2021 Feb 22840 x 856 km, 101.9 min, 98°.7
04:37NOAA 8 (NOAA E)139231983-022A2021 Feb 22785 x 807 km, 100.8 min, 98°.6
04:48NOAA 10 (NOAA G)169691986-073A2021 Feb 22790 x 806 km, 100.8 min, 98°.5
05:45USA 109 (DMSP 5D-2 F-13)235331995-015A2021 Feb 22835 x 843 km, 101.7 min, 98°.8
05:58NOAA 12 (NOAA D)212631991-032A2021 Feb 22796 x 814 km, 101.0 min, 98°.5
05:58SMAP (Soil Moisture Active Passive)403762015-003A2021 Feb 22682 x 683 km, 98.4 min, 98°.1
06:08QuakeSat278452003-031F2021 Feb 22810 x 825 km, 101.2 min, 98°.7
06:09Coriolis276402003-001A2021 Feb 22818 x 839 km, 101.5 min, 98°.7
06:09USA 249 (DMSP 5D-3 F-19)396302014-015A2021 Feb 22838 x 853 km, 101.8 min, 98°.8
06:22COBE203221989-089A2021 Feb 22870 x 884 km, 102.5 min, 98°.9
06:37USA 191 (DMSP 5D-3 F-17)295222006-050A2021 Feb 22838 x 853 km, 101.8 min, 98°.8
07:00USA 73 (DMSP 5D-2 F-11)217981991-082A2021 Feb 22827 x 847 km, 101.7 min, 98°.9
07:21NOAA 15 (NOAA K)253381998-030A2021 Feb 22798 x 812 km, 101.0 min, 98°.7
07:57WISE (Wide Field IR Explorer)361192009-071A2021 Feb 22472 x 475 km, 94.1 min, 97°.3
08:03USA 186 (KH- 11 Block-4 F1?/Crystal)288882005-042A2021 Feb 12263 x 442 km, 91.6 min, 96°.9
08:54ESSA 937641969-016A2021 Feb 221425 x 1505 km, 115.2 min, 101°.6
09:06Global-1 (Pathfinder 1)417872016-059E2021 Feb 22660 x 702 km, 98.4 min, 98°.0
09:22CEPE (Cylindrical Electrostatic Probe Experiment)47941970-106B2021 Feb 221422 x 1480 km, 114.9 min, 101°.5
09:22TIROS-N110601978-096A2021 Feb 22823 x 840 km, 101.5 min, 98°.7
09:25Oscar 5 (Australis Oscar 5)43211970-008B2021 Feb 221433 x 1477 km, 115.0 min, 101°.6
09:32Orbcomm-X (Orbcomm-X)215761991-050C2021 Feb 22751 x 755 km, 99.9 min, 98°.5
09:36Capella 3474892021-006CE2021 Feb 22522 x 537 km, 95.2 min, 97°.5
09:36ION SCV (Laurentius)475042021-006CV2021 Feb 22522 x 537 km, 95.2 min, 97°.5
09:36Starlink 2199474132021-006A2021 Feb 22514 x 532 km, 95.1 min, 97°.5
09:36XR-1475072021-006CY2021 Feb 22522 x 537 km, 95.2 min, 97°.5
09:40USA 245 (KH-11 Block-4 F3?/Crystal)392322013-043A2021 Feb 18267 x 995 km, 97.3 min, 97°.9
09:58NOAA 16 (NOAA L)265362000-055A2021 Feb 22840 x 857 km, 101.9 min, 98°.7
10:01NOAA 1 (ITOS A)47931970-106A2021 Feb 221423 x 1473 km, 114.8 min, 101°.6
10:03ITOS 143201970-008A2021 Feb 221433 x 1478 km, 115.0 min, 101°.7
10:05Skysat 7 (Skysat C5)417722016-058C2021 Feb 22491 x 494 km, 94.5 min, 97°.3
10:08Skysat 6 (Skysat C4)417712016-058B2021 Feb 22449 x 452 km, 93.6 min, 97°.2
10:10Skysat 4 (Skysat C2)417732016-058D2021 Feb 22449 x 452 km, 93.6 min, 97°.2
10:10Skysat 5 (Skysat C3)417742016-058E2021 Feb 22449 x 452 km, 93.6 min, 97°.2
10:11SkySat 15 (Skysat C13)438022018-099AW2021 Feb 22462 x 468 km, 93.9 min, 97°.2
10:12Landsat 8 (Landsat Data Continuity Mission)390842013-008A2021 Feb 22702 x 703 km, 98.8 min, 98°.2
10:13Skysat 14 (Skysat C12)437972018-099AR2021 Feb 22448 x 452 km, 93.6 min, 97°.2
10:15Global-2438122018-099BG2021 Feb 22570 x 591 km, 96.3 min, 97°.7
10:19STPSat-5437622018-099E2021 Feb 22568 x 590 km, 96.2 min, 97°.7
10:27Athena462752020-061D2021 Feb 22516 x 519 km, 95.0 min, 97°.4
10:27ION mk01 SCV LUCAS (In Orbit Now Satellite Carrier Vehicle)462742020-061C2021 Feb 22515 x 524 km, 95.0 min, 97°.4
10:27WorldView 2359462009-055A2021 Feb 22765 x 767 km, 100.2 min, 98°.5
10:29Terra (EOS AM-1)259941999-068A2021 Feb 22702 x 703 km, 98.8 min, 98°.2
10:30Geoeye 1333312008-042A2021 Feb 22673 x 685 km, 98.3 min, 98°.1
10:30Worldview 3401152014-048A2021 Feb 22612 x 614 km, 97.0 min, 97°.9
10:40LKW-2 (Land Survey Satellite 2)430802017-084A2021 Feb 22490 x 501 km, 94.5 min, 97°.4
10:41Skysat 3 (Skysat C1)416012016-040C2021 Feb 22449 x 452 km, 93.6 min, 97°.2
10:42Skysat 1394182013-066C2021 Feb 22554 x 585 km, 96.1 min, 97°.6
12:02USA 205 (STSS-ATRR)349032009-023A2020 Sep 18869 x 875 km, 102.4 min, 98°.9
12:56USA 224 (KH- 11 Block-4 F2?/Crystal)373482011-002A2020 Sep 25260 x 1018 km, 97.5 min, 97°.9
13:09Skysat 11 (Skysat C9)429892017-068C2021 Feb 22446 x 450 km, 93.6 min, 97°.2
13:11Skysat 12 (Skysat C10)429882017-068B2021 Feb 22448 x 449 km, 93.6 min, 97°.3
13:12Skysat 13 (Skysat C11)429872017-068A2021 Feb 22443 x 454 km, 93.6 min, 97°.2
13:13Skysat 9 (Skysat C7)429912017-068E2021 Feb 22447 x 450 km, 93.6 min, 97°.3
13:13Skysat 10 (Skysat C8)429902017-068D2021 Feb 22448 x 449 km, 93.6 min, 97°.3
13:14Skysat 8 (Skysat C6)429922017-068F2021 Feb 22446 x 451 km, 93.6 min, 97°.3
13:16OrbView-2248831997-037A2021 Feb 22777 x 782 km, 100.4 min, 98°.6
13:30WorldView 1320602007-041A2021 Feb 22493 x 494 km, 94.5 min, 97°.4
13:40ACRIMSat (Active Cavity Radiometer Irradiance Monitor Satellite)260331999-070B2021 Feb 22665 x 706 km, 98.5 min, 98°.1
13:41TIROS 1014301965-051A2021 Feb 22717 x 798 km, 100.0 min, 98°.3
13:57TOMS-EP239401996-037A2021 Feb 22687 x 729 km, 98.9 min, 98°.3
17:38IRAS137771983-004A2021 Feb 22879 x 906 km, 102.8 min, 99°.0
17:45IRIS (Interface Region Imaging Spectrometer)391972013-033A2021 Feb 22613 x 653 km, 97.4 min, 98°.0
17:55DMSP 5D-2 F-6 (Defense Meteorological Satellite Program)137361982-118A2021 Feb 22789 x 799 km, 100.7 min, 98°.6
17:58GNOMES 1 (GNSS Navigation and Occultation Measurement Satellites)462662020-059B2021 Feb 22601 x 607 km, 96.8 min, 97°.9
18:01USA 26 (DMSP 5D-2 F-8)181231987-053A2021 Feb 22821 x 839 km, 101.5 min, 98°.7
18:08TRACE252801998-020A2021 Feb 22508 x 541 km, 95.1 min, 97°.5
18:30AMS 3 (DMSP 5D-1 F-3)108201978-042A2021 Feb 22767 x 781 km, 100.3 min, 98°.5
18:42DMSP 5C F-2 (Defense Meteorological Satellite Program)78161975-043A2021 Feb 22774 x 851 km, 101.1 min, 98°.8
19:00DMSP 5C F-1 (Defense Meteorological Satellite Program)74111974-063A2021 Feb 22769 x 828 km, 100.8 min, 98°.7
20:17USA 216 (SBSS)371682010-048A2021 Feb 22623 x 625 km, 97.2 min, 97°.9
20:23DMSP 5A F-1 (Defense Meteorological Satellite Program)32661968-042A2021 Feb 22802 x 880 km, 101.7 min, 98°.8
20:25DMSP 5A F-3 (Defense Meteorological Satellite Program)40471969-062A2021 Feb 22764 x 828 km, 100.8 min, 98°.7
20:40DMSP 4A F-9 (Defense Meteorological Satellite Program)29201967-080A2021 Feb 22815 x 871 km, 101.8 min, 98°.9
22:56Nimbus 6 (Nimbus F)79241975-052A2021 Feb 221101 x 1112 km, 107.4 min, 100°.1
23:07SECOR 13 (EGRS 13)38911969-037B2021 Feb 221069 x 1128 km, 107.2 min, 99°.9
23:17Nimbus 3 (Nimbus B2)38901969-037A2021 Feb 221070 x 1130 km, 107.3 min, 99°.9
23:23TOPO 143631970-025B2021 Feb 221083 x 1087 km, 106.9 min, 99°.9
23:24Nimbus 5 (Nimbus E)63051972-097A2021 Feb 221088 x 1100 km, 107.1 min, 99°.9
23:44Nimbus 4 (Nimbus D)43621970-025A2021 Feb 221086 x 1098 km, 107.1 min, 100°.0

For the satellites that do not have formal published elements, thanks go to the radio and visual amateur satellite trackers for observing, and particularly to Mike McCants for archiving the derived orbits.

Classified - updated: 2021 Feb 22
SpaceTrack - updated: 2021 Feb 23