Click here for an explanation of this page.
Update history: last update 2017 Sep 29 (actually, many updates since then not yet documented!)
Click here for some news concerning recent artificial satellite detections.
Click here for data on natural satellites and planets. I've split them off; everything here is artificial.
You can get ephemerides for some of these objects from the Minor Planet Center's Distant Artificial Satellites Observation page, or from the Jet Propulsion Laboratory's Horizons system, customized for your observing location and desired time span.
You can also get TLEs (Two-Line Elements) for many of these objects.
If you've found an artificial satellite whilst doing astrometry and would like to identify it, this on-line satellite identification tool will probably help. (It includes most of the following objects, as well as those covered by Space-Track.org, plus some "classified" objects tracked by amateurs that aren't covered elsewhere.)
Also, Peter Birtwhistle has posted a few more pseudo-MPECs for artificial satellites here.
Unidentified, in geocentric orbit : GS61LA (P=630m, i=26, e=.72; P. Birtwhistle find) S510956 (P=708m, i=28, e=.73) S509594 (P=710m, i=26, e=.73) GS428A (unidentified Molniya) 8Q58E4F = unknown Molniya TJ7B205 = unknown Molniya S511443 = unid: P=1214m, e=.813, i=24.0 5F2A7C7 = 5F2A7C8 = 5F2A7C9 = 5F2A7D1 = unkn (P=1263m, e=.76, i=3) Unknown satellite (5G4FAAB) (P=1300m, e=.30, i=28) S510126 (P=1246m, e=.81, i=22.7) S509481 (P=1282m, e=.78, i=39.8) S510125 (P=1296m, e=.81, i=23.1) ZTF00YB (P=1300m, e=.8, i=15; very approximate orbit) E1NB003 (P=1312m, e=.825, i=24) S510210 (P=1314m, e=.80, i=36.6); possibly S510977 (below) S510977 (P=1314m, e=.81, i=31); possibly S510210 (above) S510990 (P=1342m, i=25.8, e=.80) S511390 (P=1355m, i=16, e=.79) VA3730D = unknown artsat (e=.62, P=1356m, i=17) ZTF01nf (P=1377m, i=32.97, e=0.781) YE86B74 = unknown artsat (e=.785, P=1395m, i=28.1) ZTF01sS = ZTF01sX = ZTF01wl (P=1402m, e=.70, i=22.72); ETBO ZTF02Uy = ZTF02rw = ZTF02V0 (P=1405m, e=.80, i=25.02); ETBO YDB93D4 = unid; P=1404m, e=.73, i=5.5 Unknown satellite (5B1AE88) (P=1411m, e=.78, i=23) S509475 = unid; P=1417m, e=.52, i=28.6 S511374 = unid; P=1420m, e=.78, i=15.1 ZTF02ry = ZTF02s1 (P=1454m, e=.65, i=40.4) SG97830 (P=1.01d, i=10, e=.78) RW28E3B = 2010 WK1 (P=1.01d, i=27, e=.69) S511450 (P=1414m, i=14, e=.63) ZTF00V9 = ZTF00Vv = ZTF00Y5 (P=1427m, e=.757, i=15.1); ETBO ZTF00Y9 = ZTF00Yp = ZTF00ah (P=1527m, e=.750, i=22.0); ETBO ZTF01rZ (P=1499m, e=.82, i=35.5) ZTF01ZJ (P=1502m, e=.767, i=34.1) ZTF00pm = ZTF01Ls (P=1764m, e=.796, i=10.8); ETBO ZTF00hf = ZTF00YB = ZTF01Xb = ZTF01Vs (P=1713m, e=.736, i=15.6); ETBO S510995 (P=1452m, i=23.6, e=.56) S510942 (P=1458m, i=25.5, e=.48); probably related to 038001s (below) 038001s (P=1462m, i=25.1, e=.46); probably related to S510942 (above) 9D1BD3A = unknown (P=1460m, i=37, e=.71) 6H61SAT (p=1524m, e=.57, i=12) 8UB359A = unknown (P=1532m, i=42, e=.67) ZTF00HU = unknown (P=1534m, i=41, e=.80) YCB2EAD = unid; P=1576m, e=.83, i=2.6 9V9BAC8 = unknown; P=1.11 days, e=.84, i=22 5X2744B = unknown, P=1.20d, e=.72 EJA002 (P=1.01d, i=21, e=.11) WF12200 (P=1.04d, e=.78, i=21) YB98FF0 (P=1647m, e=.82, i=18) V00278 (P=1.27d, i=7, e=.61) XE9C2B4 = unknown, P=1.26d, e=.7, i=22 ZTF01wS = ZX13D7B; P=1811m, i=11.408, e=.8575 TMG0011 : P=1840m, i=42.41, e=0.4680 ZTF01aQ (P=1883m/1.3d, e=.74, i=29.8) HJ0110 = HJ0111 = unknown, P=1.27d, e=.86, i=16 (probably reëntered mid-2008) YCB3006 = unid; P=2005m, e=.78, i=4.7 ZTF01nQ : P=2023m/1.4d, i=38, e=0.62 (approx orbit) S511387 = unid: P=2070m, e=.87, i=23 SWA987E = unid: P=2330m, e=.67, i=23 5K38A77 = 5K38A7A = unk, P=1.9d, i=83, e=0.83 XW99CEC = XV902A4 = unknown, P=2.1d, i=18 XB17DFE = unk, P=2930m, i=11, e=.726 UR29394 (P=2.12d, e=.81, i=12) S510958 (P=3066m, i=12.7, e=.54) ZTF01a9 = ZV2F779 = ZTF01nS (P=3078m/2.14d, e=.664, i=26.6) ZTF02Rj = ZTF02Rn (P=3196m/2.22d, e=.67, i=26.5); H=33.2 (i.e., tiny) 9O0DC57 = unknown, P=2.26d, e=.75, i=42 5O55D41 (P=2.38d, e=.60, i=93) = probable Cluster satellite; dunno which one S509575 = unid; P=3700m/2.57d, e=.34, i=23 YS16534 = YS18A5C = A104ayW = unid; P=2.2d, e=.83, i=20 (very uncertain) A107EL8 = ZTF00Tq (P=3810m/2.646d, e=.733, i=81.73) ZTF02CP : P=4239m/2.943d, i=23.78, e=0.847 XWA402E = unknown, P=3.6d, i=34 ZD8FCAE = unknown, P=3.73d, i=7, e=.84; Vela hardware? (~half meter across) S511360 = unid; P= about four days, e=.89, i=24 (uncertain) S509559 = probable Vela: P=6733m/4.68d, e=.45, i=13 S510923 (P=7702m, e=.03, i=38.4); probably SOLRAD 11 hardware A10bMLz (P=14.7d, e=.97, i=122); ETBO UDA34A3 = UW8551D = unknown, P=28.6d, e=.86, i=71; linked to WT1190F 9U01FF6 = unknown, linked to UDA34A3 = UW8551D = WT1190F XL8D89E (P=95d; probably = 6Q0B44E) 6Q0B44E = unknown, P=80d, e=.24, i=41; probably = XL8D89E Identified, in geocentric orbit : 2015-075C: P=631m, e=.72, i=49 2013-020B: P=673m, e=.74, i=27 1993-095D: P=685m, e=.74, i=15 2004-027B = NORAD 28379: P=693m, e=.73, i=6.5 1997-035A = NORAD 24876 = NAVSTAR 43: P=718m, i=56, e=0 2010-058A = NORAD 37212: P=718m, e=.69, i=63 2000-072E = NORAD 26612: P=714m, e=.74, i=7 2011-674A = non-Spacetrack obj: P=716m, e=.73, i=27 2017-018B = NORAD 42663 = CZ-3B Stage 3; P=722m, i=21 2011-056B = NORAD 37835: P=732m, e=.57, i=19 1979-104S = NORAD 27732 = Ariane L01 deb (P=745m, e=.73) 2010-042S = NORAD 40165 = deb CZ-3B (P=746m, e=.73) 2018-012C = NORAD 43176 = ESC-A 5101: P=769m, e=.76, i=21 2011-077G = NORAD 40183: P=790m, e=.76, i=21 2008-001B = NORAD 32405: P=640m, e=.71, i=6 2016-079B = NORAD 41894: P=1203m, e=.83, i=26 : decayed 2017 Mar 7 2015-010C = NORAD 40426: P=1237m, e=.83, i=25 2009-017B = NORAD 34714: P=1260m, e=.82, i=21 (2010 observations) 2009-017B = NORAD 34714 (2015 observations) 2016-038A = NORAD 41588 = ABS 2A: e=.78, P=1283m, i=17.8 2016-038C = NORAD 41590: e=.81, P=1223m, i=22.2 2016-035B = NORAD 41582 : e=.79, P=1278m, i=31.0 2012-011B = NORAD 38099: P=1288m, e=.78, i=25 2015-005B = NORAD 40385 (P=1296m, e=.767, i=25.4) 2015-011E = WF839C3 = MMS obj (e=.83, P=1300m, i=29) 2013-026B = NORAD 39173 (e=.76, P=1303m, i=28) 2013-024B = NORAD 39169 = WGS 5 Rk (P=1312m, e=.822, i=22.5) 2013-041B = NORAD 39224 = WGS 6 Rk = S509434 (P=1269m, e=.83, i=26.3) SOLRAD 11A = 1976-023C = NORAD 08748 = WB31C9F = XC83E0D (P=5d, e=0) 2015-036B = NORAD 40747 = Delta 4 R/B (P=1308m, e=.825, i=24.6) 2015-042B = NORAD 40883 = Breeze-M R/B (P=1306m, e=.77, i=28) 2013-073C: P=1310m, e=.68, i=30 2012-003B = NORAD 38071 = WGS 4 r (P=1247m, e=.82, i=23.5) 2017-025B = NORAD 42699 (P=1401.6m, e=.83, i=25) 2012-057B = NORAD 38868 = Breeze-M Rkt (P=1639m, e=.057, i=3) 2007-004A = NORAD 30580 = THEMIS-A (P=1640m, e=0.83, i=9) 2007-004G = NORAD 30799 = THEMIS booster (P=1812m, e=0.85, i=10) 2007-004D = NORAD 30797 = THEMIS-D (P=1917m, e=0.84, i=5) 2019-021B = NORAD 44187 = Falcon 9 rk (P=1928m, i=22.8, e=0.866) 2016-031B = NORAD 41553 = S510599; P=1947m, e=.87, i=22.2 WJ2B5AC = 2002-048A = NORAD 27540 = Integral (e=.81, i=54, P=2.66 days) Integral (older observations) 2015-019C = NORAD 41929 = S509356 = WJ2AD07 (P=5157m, i=40.8, e=.66) 1963-039C (P=4.50d, e=.57, i=32) = Vela 1B DSCOVR booster = 2015-007B = NORAD 40391 (P=39d, e=.18, i=58) 2009-068B = NORAD 36109 = WF0AEDA = S509590 = WGS 3 rocket (P=1230m, e=.82, i=23) Gaia = 2013-74A = NORAD 39479 Gaia = 2013-74A = NORAD 39479 (more recent observations) Chang'e 3 booster = 2013-070B = NORAD 39459 Planck Herschel 2009-026C = HPO3 = booster for Herschel/Planck 2009-026D = HPO1 = Sylda for Herschel/Planck 2009-026E = HPO4 = unidentified debris from Herschel/Planck 2009-026F = HPO5 = unidentified debris from Herschel/Planck 2008-051A = IBEX = TR93D0F = NORAD 33401 UE2A938 = IMP7 = 1972-073A Chinese Fengyun satellite going to geosynchronous orbit #1 Chinese Fengyun satellite going to geosynchronous orbit #2 Spektr-R = 2011-037A = NORAD 37755 TA29DCF = 2011-037B = Spektr-R booster, P=8.2d, e=.75, i=82 2010-050A = SM999CF = Chang'e 2 probe 2010-050B = RV223A9 = Chang'e 2 booster THEMIS-B THEMIS-C 2000-041A = Cluster II-FM6 = NORAD 26410 2000-041B = NORAD 26411 = Cluster II / FM6 Salsa 1963-039A = NORAD 00674 = Vela 1a (P=6488m/4.51d, i=34, e=.39) 1964-040A = NORAD 00836 = Vela 2a (P=6020m/4.18d, i=66, e=.71) 1964-040B = NORAD 00837 = Vela 2b (P=6000m/4.17d, i=28, e=.77) 1964-054A = NORAD 00879 = OGO 1 1965-058A = NORAD 01458 = Vela 3a 1965-058B = NORAD 01459 = Vela 3b 1967-040A = NORAD 02765 = UU0E325 = UV18B9C = Vela 7 (P=4.5d, i=7, e=.46) 1967-040F (P=2d, e=.88, i=11) 1968-014B = NORAD 03145 = 5X5E564 = 9V7C9B5 =OGO 5 rk (P=2.58d, e=.85, i=46); since decayed 1969-046D = Vela 5a = NORAD 03954 = JNS023 1969-046F = Vela booster = NORAD 03956 1973-058B (P=650m, e=.72, i=28) 1977-093A = Prognoz 6 = NORAD 10370(e=.90, i=78, P=3.95 days) 1977-093E = NORAD 32705 = SL-6 R/B(2) (e=.77, i=52, P=3.88 days) 1983-020A (ASTRON) (NORAD 13901) 1983-020D (ASTRON booster) (NORAD 20413) 2003-061B = NORAD 28141 Chandra = 1999-040B = NORAD 25867 = 6L05B60 Chandra booster = 1999-040D = NORAD 25869 (P=1.07d, i=31, e=.82) XMM-Newton = 1999-066A = 25989U 1999-066B = XMM-Newton booster = NORAD 25990 Geotail = 1992-044A = NORAD 22049 IMP-8 (International desig 1973-078A, NORAD 06893) 1995-062A = NORAD 23715 = Infrared Space Observatory (ISO) 1995-062B = ISO Rk = NORAD 23716 POLAR = 1996-013A (P=1109m, e=.65, i=82; high-flyer over southern hemisphere) WMAP Wind 2018-038A = NORAD 43435 = TESS (P=14d) 2018-103B = NORAD 43846 = Chang'e 4 booster 2018-045A = Queqiao lunar communications relay 2018-045D = Queqiao booster 2019-040A = Spektr-RG 2019-040B = Spektr-RG booster Artsats in heliocentric orbit : OSIRIS-REx (2016-055A), 2017 September flyby Cassini Deep Impact EPOXI ExoMars booster ExoMars spacecraft ExoMars fuel tank = 2016-017C = NORAD 41390 ExoMars spacecraft + booster (before leaving Earth orbit) GENESIS Hayabusa Hayabusa 2 (December 2014, leaving Earth) Hayabusa 2 (December 2015, Earth flyby) J002E3 = temporarily captured Apollo 12 SIV-B stage Juno Kepler LCROSS (2009 mission that impacted the moon) MESSENGER MRO = Mars Reconnaissance Orbiter MRO Centaur booster Mars Science Laboratory Mars Science Laboratory's Centaur booster NExT 2018-065B = NORAD 43593 = Parker Solar Probe 2nd stage 2018-017A = Elon Musk's Tesla roadster RK252A5 = flyby piece of artificial hardware Rosetta STEREO-B STEREO booster = 2006-047C 6R10DB9 = unknown, probable rock
ETBO (Empty Trash Bag Object) : Certain objects have been found, starting in late 2018, which have unusually large area/mass ratios (they're usually about a square meter in cross-section with masses of dozens of grams, and are probably loose bits of insulation.) I've since learned that such objects have been known to the space surveillance community for some time, and have been designated as HAMRs, for "high area/mass ratio" objects. They are pushed around a lot by solar radiation pressure, making their future trajectories about as predictable as an empty trash bag blowing down a street. Which is why I started calling them "empty trash bag objects", or "ETBOs".
We probably started seeing them before 2018, but back then, I would have rejected any orbit involving such high area/mass ratios. It required the case of ZTF00Y9, the first object identified securely as an ETBO, to convince me that we might actually see such objects.
(2017 Sep 29) Added 2016-055A = OSIRIS-REx, updated 1969-046F = Vela booster, IBEX = 2008-051A, YS16534 = YS18A5C = A104ayW, 2002-048A = Integral, 1964-054A.
(2017 Sep 18) Added 1979-104S = NORAD 27732, S511360, YS16534; removed HJ0111, as it was actually identical to HJ0110 = HJ0111 = unid, which is updated.
(2017 Sep 08) Quite a bit of updating of pseudo-MPECs has occurred, but this index page has lagged in mentioning them. Newly added are 2017-025B = NORAD 42699, YDB93D4 = unid; updated 1967-040F, Chang'e 3 booster = 2013-070B = NORAD 39459, 2016-038C = NORAD 41590, 1995-062A = NORAD 23715 = Infrared Space Observatory (ISO), 2009-068B = NORAD 36109 = WF0AEDA = S509590 = WGS 3 rocket, Geotail = 1992-044A = NORAD 22049, S510923 (probable SOLRAD 11 hardware), S510990, 1983-020D (ASTRON booster) (NORAD 20413), and many, many more.
(2017 Apr 26) Added S510977, S510990; updated 1983-020A (ASTRON) (NORAD 13901), 1983-020D (ASTRON booster) (NORAD 20413), 1995-062B = ISO Rk, Chandra booster = 1999-040D = NORAD 25869, 2012-003B = NORAD 38071 = WGS 4 r, 2013-026B = NORAD 39173, 2013-041B = NORAD 39224 = WGS 6 Rk = S509434 , 2015-010C = NORAD 40426, 2015-019C = NORAD 41929, 2015-036B = NORAD 40747 = Delta 4 R/B, 2015-042B = NORAD 40883 = Breeze-M R/B.
(2017 Mar 16) Updated 2015-019C = NORAD 41929, 1995-062B = ISO Rk, 2007-004G = Themis booster, 2013-026B = NORAD 39173, 2015-042B = NORAD 40883 = Breeze-M R/B, RW28E3B = 2010 WK1; added 2010-058A = NORAD 37212.
(2017 Mar 08) Added XB17DFE and YE86B74 (both new and un-ID'ed); identified S509356 = WJ2AD07 as 2015-019C = NORAD 41929 and S510599 as 2016-031B = NORAD 41553; updated IMP-7.
(2017 Feb 18) Added 2007-004G = Themis booster; updated 1995-062B = ISO Rk, 2012-011B.
(2017 Feb 18) Added a page with more recent data for Gaia. The older Gaia page still exists with some remarks about Gaia's initial trajectory to the Earth-Sun L2 point.
(2017 Feb 16) Added YB98FF0 = unknown, YCB2EAD, YCB3006, 2012-011B = NORAD 38099, 2015-010C = NORAD 40426, S510958 (P=3066m, i=12.7, e=.54), S510956 (P=708m, i=28, e=.73), updated XL8D89E, 1965-058A = NORAD 01458 = Vela 3a, S509356 = WJ2AD07
(2016 Nov 28) Added XW99CEC = XV902A4 = unknown, XWA402E = unknown, 1997-035A = NORAD 24876 = NAVSTAR 43, 9D1BD3A, 8UB359A, 5K38A77 = 5K38A7A, 5F2A7C7 = 5F2A7C8 = 5F2A7C9 = 5F2A7D1, SWA987E, updated 2016-035B = NORAD 41582, 2015-005B = NORAD 40385, XL8D89E, S509356 = WJ2AD07, 1967-040A = NORAD 02765 = Vela 7, S510923 (probable SOLRAD 11 hardware),
(2016 Sep 29) Added S510942 and 038001s. These look to be at least related, and may be the same object with a maneuver in between. Also added 1964-054A = NORAD 00879 = OGO 1 and updated 2013-073C, 2016-038A = NORAD 41588 = ABS 2A, IMP-7, and Spektr-R = 2011-037A = NORAD 37755.
(2016 Sep 14) Updated 9O0DC57 = unid, 1969-046F = Vela booster = NORAD 03956, Geotail = 1992-044A = NORAD 22049, 1995-062A = NORAD 23715 = Infrared Space Observatory (ISO), Chandra = 1999-040B = NORAD 25867 = 6L05B60, 1999-066B = XMM-Newton booster = NORAD 25990, 2010-050B = RV223A9 = Chang'e 2 booster, 2013-020B, 2013-073C, 2015-005B = NORAD 40385, 2015-011E = WF839C3 = MMS obj, DSCOVR booster = 2015-007B = NORAD 40391; added new objects S510599 = unid, S510923 (probable SOLRAD 11 hardware), 2011-056B = NORAD 37835, 2011-077G = NORAD 40183, 2016-035B = NORAD 41582.
(2016 Jul 31) Updated 1967-040F, 1995-062A = Infrared Space Observatory (ISO), XMM-Newton = 1999-066A, 1992-044A = Geotail, 2013-073C, 2015-011E = WF839C3 = MMS obj, and Hayabusa.
(2016 Jul 17) added new objects 2016-038A = NORAD 41588 = ABS 2A; updated 1995-062A = Infrared Space Observatory (ISO), 1977-093A = Prognoz 6 and 2010-050B = Chang'e 2 booster.
(2016 Jul 11) Added S510210 (P=1314m, e=.80, i=36.6), 1993-095D: P=685m, e=.74, i=15, 2015-075C: P=631m, e=.72, i=49, and 2013-073C: P=1310m, e=.68, i=30; updated XL8D89E, the ExoMars spacecraft, Chang'e 3 booster = 2013-070B = NORAD 39459, XMM-Newton = 1999-066A = 25989U, 1983-020A (ASTRON) (NORAD 13901), 1983-020D (ASTRON booster) (NORAD 20413), 2013-024B = NORAD 39169 = WGS 5 Rk , 1999-066B = XMM-Newton booster = NORAD 25990, and 1995-062A = NORAD 23715 = Infrared Space Observatory (ISO).
(2016 Jun 19) Added S509475, S509594, 5B1AE88 and 1999-066B = XMM-Newton booster = NORAD 25990; updated GS428A (unknown Molniya).
(2016 Jun 16) Added XL8D89E , a very high-flier that is almost certainly the same object as 6Q0B44E. I've not actually gotten a linked orbit yet, probably due to odd non-gravitational forces. Also added E1NB003, 2013-020B, 2012-057B = NORAD 38868 = Breeze-M Rkt, and 2008-001B = NORAD 32405. Posted an improved version for STEREO-B with sigmas and a few more observations that somehow didn't make it in the first time.
(2016 May 31) Updated S509356 = WJ2AD07 = 2015-019C in 3.56-day orbit and 6H61SAT (p=1524m, e=.57, i=12).
(2016 May 30) Added 1995-062A = NORAD 23715 = Infrared Space Observatory (ISO) and S509575 = unid; updated 2009-068B = NORAD 36109 = WF0AEDA = S509590 = WGS 3 rocket, 1968-014B = NORAD 03145 = OGO 5 rk, Chandra booster = 1999-040D = NORAD 25869, Chandra = 1999-040B = NORAD 25867 = 6L05B60, Chandra booster = 1999-040D = NORAD 25869, and XMM-Newton = 1999-066A = NORAD 25989; sorted the list into categories.
(2016 May 11) Added the newly-found S509559 = probable Vela; updated 2013-041B = NORAD 39224 = WGS 6 Rk = S509434 and 2013-024B = NORAD 39169 = WGS 5 Rk; updated and identified 1967-040A = NORAD 02765 = UV18B9C = UU0E325 = Vela 7 . When this object was tracked in 2013 and 2014, it matched no TLEs. Sometime in 2015, JSpOC started providing TLEs for it.
(2016 May 10) Updated Chandra booster = 1999-040D = NORAD 25869, 2013-041B = NORAD 39224 = WGS 6 Rk, and 2015-042B = NORAD 40883 = Breeze-M R/B.
(2016 May 4) Added XMM-Newton (actually an update of this 2005 version).
(2016 Apr 22) Added a linked solution for S509356 = WJ2AD07 = 2015-019C; updated 2015-042B = NORAD 40883 = Breeze-M R/B.
(2016 Apr 12) Added S509356 = 2015-019C , 2013-041B = NORAD 39224 = WGS 6 Rk = S509434, XE9C2B4, the ExoMars booster and ExoMars spacecraft, the ExoMars fuel tank, and the combined ExoMars spacecraft and booster while they were still in geocentric orbit. Also updated DSCOVR booster = 2015-007B, 2013-024B, 2010-050B = Chang'e 2 booster, TA29DCF = Spektr-R booster, 9O0DC57, IMP-7, 2015-042B = NORAD 40883 = Breeze-M R/B, and 2015-036B = NORAD 40747 = Delta 4 R/B.
(2016 Feb 17) Added 2013-024B = NORAD 39169 = WGS 5 Rk.
(2016 Feb 11) Added a pseudo-MPEC for SOLRAD 11A = 1976-023C = NORAD 08748 = WB31C9F = XC83E0D.
(2016 Feb 9) Added pseudo-MPECs for WJ2AD07 = unknown P=4.04d, i=53 (note: since linked to S509356 = 2015-019C).
(2016 Feb 5) Added a pseudo-MPEC for 2012-003B = NORAD 38071 = WGS 4 r.
(2016 Jan 16) Recognized that 2008-051A = IBEX = TR93D0F = NORAD 33401, and revised the pseudo-MPEC accordingly. There's still a pseudo-MPEC based on the 2008 observations, back when the object was in a lower orbit.
(2015 Jun 3) Added WJ2B5AC
(2015 Mar 28) Updated Chang'e 2 and 3 boosters, IMP-7, IMP-8, TR93D0F, and 9O0DC57, added Hayabusa 2, and removed UX299E3 (it's a duplicate of 9O0DC57)
(2015 Mar 27) Added WF0AEDA = 2009-068B, WF12200 , and DSCOVR booster
(2014 Dec 30) Updated TA29DCF = Spektr-R booster, P=8.2d, e=.75, i=82
(2014 Feb 12) Updated UDA34A3 = UW8551D = unknown, P=28.6d, e=.86, i=71
Updated Gaia = 2013-74A = NORAD 39479 2014 Feb 12
Updated TA29DCF = Spektr-R booster, P=8.2d, e=.75, i=82 2014 Jan 28
Updated THEMIS-B 2014 Jan 22
Updated WMAP 2014 Jan 22
Updated VA3730D = unknown artsat (e=.62, P=1 day, i=17) 2014 Jan 6
Updated Chang'e 3 booster 2013 Dec 30
Updated 2013 Dec 8 with UX299E3, UR29394
Updated 2013 Dec 1 with 9U01FF6, UDA34A3 = UW8551D linked and TLEs given
Updated 2013 Nov 17 with TA29DCF = Spektr-R booster revision
Updated 2013 Nov 7 with UU0E325 revision
Updated 2013 Oct 31 with TR93D0F revision, UU0E325 (new)
Updated 2013 Aug 29 with Mars I = Phobos, Chang'e 2 booster revision
Updated 2013 Jul 28 with Kepler, NExT, 2009-017B, UDA34A3, Wind, others
The artificial satellites listed on this page were observed by near-earth object searchers, mostly the "big surveys" that are looking for rocks that might hit us. To such surveys, a small satellite in a high orbit can look a lot like a more distant, larger, faster rock. Both appear as a point of light moving at similar speeds.
The surveys are focussed on finding rocks that might hit us; they're utterly uninterested in artificial satellites. From their viewpoint, the artsats they find are just "vermin of the skies". Space-Track does not appear to be very interested in objects with orbital periods greater than a few days. Such objects are usually scientific payloads or leftover hardware; they aren't collision hazards or likely to have military uses. They're also hard to track with radar, which is the primary search method for Space-Track. (Radar's effectiveness drops sharply with distance. It does a beautiful job for tracking objects in low-earth orbit, and can still get objects in geostationary orbit. For objects out near the Moon, it's almost useless, and optical tracking works much better.)
The asteroid surveys can safely assume that anything moving above a certain apparent angular speed is probably artificial. But these objects in high orbits can cause trouble. We can waste a good bit of time tracking what looks like an "exciting" rock, only to find out that it's just a piece of high-flying junk.
To guard against that, I've been taking the (mostly incidental) observations of such objects and analyzing them to compute the orbits and ephemerides you see above, and to compute TLEs for most of them. I also provide tools for identifying artsats from observations (with the observations provided in the form normally used by the asteroid community.)