Welcome to MPEC Watch!

MPEC Watch provides various metrics and plots derived from Minor Planet Center's Minor Planet Electronic Circular service. This website is created and maintained by Quanzhi Ye and Taegon Hibbitts. Tables and plots are automatically updated at midnight US Eastern Time. We welcome bug reports and suggestions! Please submit them at our GitHub repo.

Last update: UTC 2026-02-22 05:38:07

At a glance

Term definition: Editorial - Editorial notices and announcements by the Minor Planet Center.
Discovery - MPECs associated with discoveries.
OrbitUpdate - MPECs associated with orbit updates of single or a few objects; these are usually recoveries of single-opposition objects.
DOU - Daily Orbit Update.
ListUpdate - MPECs associated with updates to a list of interesting objects. This category has largely been retired since 2012.
Retraction - Retracted MPECs.
Other - MPECs that do not fit into categories listed above.

Year Total MPECs Editorial Discovery P/R/FU DOU List Update Retraction Other
P/R/FU - precovery/recovery/follow-up.
2026 569 4 425 87 52 0 0 1
2025 4449 3 3347 740 355 0 3 1
2024 4756 6 3433 947 367 0 3 0
2023 3454 2 2564 569 314 0 5 0
2022 3830 1 2939 561 324 0 0 5
2021 4035 2 3003 698 325 0 0 7
2020 3760 0 2939 453 350 0 0 18
2019 3356 0 2279 732 336 0 1 8
2018 2644 0 1867 437 333 0 3 4
2017 2466 0 1820 343 300 0 0 3
2016 3070 0 2199 528 342 0 1 0
2015 2486 1 1660 457 364 0 4 0
2014 2170 1 1447 360 361 0 1 0
2013 1773 1 1073 347 351 0 0 1
2012 1523 1 897 285 335 0 3 2
2011 1524 1 875 269 333 46 0 0
2010 1893 0 891 596 339 65 1 1
2009 1899 1 829 629 365 72 0 3
2008 1805 1 820 562 354 66 0 2
2007 1747 1 669 628 362 87 0 0
2006 1698 2 713 554 357 70 0 2
2005 1523 0 600 529 331 63 0 0
2004 1408 0 476 537 319 75 0 1
2003 1618 1 512 682 358 65 0 0
2002 1552 6 535 601 333 77 0 0
2001 1303 3 515 368 331 84 0 2
2000 1134 0 418 354 290 70 0 2
1999 899 2 323 176 325 73 0 0
1998 692 1 253 79 316 42 0 1
1997 301 1 91 145 16 48 0 0
1996 207 0 61 94 0 52 0 0
1995 178 2 66 69 0 41 0 0
1994 180 0 65 97 0 16 0 2
1993 56 2 20 30 0 1 0 3

Top MPEC Contributors

Last 1 year (2025-02-22 to 2026-02-22)

# Observatory Total MPECs
1 I52 Steward Observatory, Mt. Lemmon Station 1792
2 F51 Pan-STARRS 1, Haleakala 1733
3 F52 Pan-STARRS 2, Haleakala 1652
4 807 Cerro Tololo Observatory, La Serena 1260
5 H21 Astronomical Research Observatory, Westfield 1246
6 G96 Mt. Lemmon Survey 1194
7 H01 Magdalena Ridge Observatory, Socorro 806
8 I41 Palomar Mountain--ZTF 748
9 L01 Visnjan Observatory, Tican 626
10 033 Karl Schwarzschild Observatory, Tautenburg 584

Last 5 years (2021-02-23 to 2026-02-22)

# Observatory Total MPECs
1 I52 Steward Observatory, Mt. Lemmon Station 8880
2 F51 Pan-STARRS 1, Haleakala 7893
3 G96 Mt. Lemmon Survey 7523
4 F52 Pan-STARRS 2, Haleakala 7382
5 H21 Astronomical Research Observatory, Westfield 5832
6 807 Cerro Tololo Observatory, La Serena 4133
7 L01 Visnjan Observatory, Tican 4116
8 033 Karl Schwarzschild Observatory, Tautenburg 3189
9 703 Catalina Sky Survey 2468
10 I93 St Pardon de Conques 2387

All time (since 1993-09-19)

# Observatory Total MPECs
1 G96 Mt. Lemmon Survey 21262
2 F51 Pan-STARRS 1, Haleakala 19540
3 I52 Steward Observatory, Mt. Lemmon Station 16361
4 H21 Astronomical Research Observatory, Westfield 14306
5 291 LPL/Spacewatch II 10828
6 703 Catalina Sky Survey 10223
7 F52 Pan-STARRS 2, Haleakala 9565
8 J95 Great Shefford 9427
9 807 Cerro Tololo Observatory, La Serena 9255
10 L01 Visnjan Observatory, Tican 7629

Top MPEC-ed Discoverers

Last 1 year (2025-02-22 to 2026-02-22)

# Observatory Total MPECs
1 F52 Pan-STARRS 2, Haleakala 809
2 G96 Mt. Lemmon Survey 640
3 F51 Pan-STARRS 1, Haleakala 556
4 V00 Kitt Peak-Bok 359
5 U68 JPL SynTrack Robotic Telescope, Auberry 185
6 703 Catalina Sky Survey 168
7 W94 MAPS, San Pedro de Atacama 108
8 I41 Palomar Mountain--ZTF 77
9 K88 GINOP-KHK, Piszkesteto 65
10 T09 Subaru Telescope, Maunakea 55

Last 5 years (2021-02-23 to 2026-02-22)

# Observatory Total MPECs
1 G96 Mt. Lemmon Survey 4466
2 F52 Pan-STARRS 2, Haleakala 3285
3 F51 Pan-STARRS 1, Haleakala 2770
4 V00 Kitt Peak-Bok 1041
5 703 Catalina Sky Survey 683
6 W94 MAPS, San Pedro de Atacama 308
7 K88 GINOP-KHK, Piszkesteto 285
8 T08 ATLAS-MLO, Mauna Loa 256
9 U68 JPL SynTrack Robotic Telescope, Auberry 256
10 T05 ATLAS-HKO, Haleakala 201

All time (since 1993-09-19)

# Observatory Total MPECs
1 G96 Mt. Lemmon Survey 12496
2 F51 Pan-STARRS 1, Haleakala 9099
3 F52 Pan-STARRS 2, Haleakala 3817
4 703 Catalina Sky Survey 3780
5 704 Lincoln Laboratory ETS, New Mexico 2512
6 V00 Kitt Peak-Bok 1092
7 691 Steward Observatory, Kitt Peak-Spacewatch 862
8 568 Maunakea 704
9 T08 ATLAS-MLO, Mauna Loa 577
10 E12 Siding Spring Survey 475

Top MPEC-ed Follow-up Observatories

Last 1 year (2025-02-22 to 2026-02-22)

# Observatory Total MPECs
1 I52 Steward Observatory, Mt. Lemmon Station 1459
2 807 Cerro Tololo Observatory, La Serena 1019
3 H21 Astronomical Research Observatory, Westfield 996
4 H01 Magdalena Ridge Observatory, Socorro 751
5 L01 Visnjan Observatory, Tican 586
6 F51 Pan-STARRS 1, Haleakala 548
7 I41 Palomar Mountain--ZTF 533
8 033 Karl Schwarzschild Observatory, Tautenburg 446
9 I93 St Pardon de Conques 410
10 U74 JPL SynTrack Robotic Telescope 2, Auberry 365

Last 5 years (2021-02-23 to 2026-02-22)

# Observatory Total MPECs
1 I52 Steward Observatory, Mt. Lemmon Station 7243
2 H21 Astronomical Research Observatory, Westfield 4798
3 L01 Visnjan Observatory, Tican 3872
4 807 Cerro Tololo Observatory, La Serena 3089
5 033 Karl Schwarzschild Observatory, Tautenburg 2602
6 F51 Pan-STARRS 1, Haleakala 2280
7 H01 Magdalena Ridge Observatory, Socorro 2231
8 I93 St Pardon de Conques 2199
9 F52 Pan-STARRS 2, Haleakala 1743
10 204 Schiaparelli Observatory 1737

All time (since 1993-09-19)

# Observatory Total MPECs
1 I52 Steward Observatory, Mt. Lemmon Station 13431
2 H21 Astronomical Research Observatory, Westfield 10161
3 L01 Visnjan Observatory, Tican 7074
4 H01 Magdalena Ridge Observatory, Socorro 6514
5 J95 Great Shefford 6148
6 291 LPL/Spacewatch II 5841
7 807 Cerro Tololo Observatory, La Serena 5830
8 033 Karl Schwarzschild Observatory, Tautenburg 4604
9 I93 St Pardon de Conques 3987
10 204 Schiaparelli Observatory 3753

Top MPEC-ed First Follow-up Observatories

Last 1 year (2025-02-22 to 2026-02-22)

# Observatory Total MPECs
1 I52 Steward Observatory, Mt. Lemmon Station 637
2 F51 Pan-STARRS 1, Haleakala 301
3 H01 Magdalena Ridge Observatory, Socorro 289
4 807 Cerro Tololo Observatory, La Serena 186
5 U74 JPL SynTrack Robotic Telescope 2, Auberry 182
6 F52 Pan-STARRS 2, Haleakala 145
7 291 LPL/Spacewatch II 102
8 V06 Catalina Sky Survey-Kuiper 102
9 T14 Canada-France-Hawaii Telescope, Maunakea 102
10 H21 Astronomical Research Observatory, Westfield 100

Last 5 years (2021-02-23 to 2026-02-22)

# Observatory Total MPECs
1 I52 Steward Observatory, Mt. Lemmon Station 3873
2 F51 Pan-STARRS 1, Haleakala 1069
3 H01 Magdalena Ridge Observatory, Socorro 961
4 807 Cerro Tololo Observatory, La Serena 744
5 F52 Pan-STARRS 2, Haleakala 635
6 L01 Visnjan Observatory, Tican 603
7 V06 Catalina Sky Survey-Kuiper 550
8 H21 Astronomical Research Observatory, Westfield 492
9 033 Karl Schwarzschild Observatory, Tautenburg 441
10 291 LPL/Spacewatch II 436

All time (since 1993-09-19)

# Observatory Total MPECs
1 I52 Steward Observatory, Mt. Lemmon Station 6967
2 H01 Magdalena Ridge Observatory, Socorro 3117
3 291 LPL/Spacewatch II 2445
4 H21 Astronomical Research Observatory, Westfield 1696
5 807 Cerro Tololo Observatory, La Serena 1691
6 568 Maunakea 1523
7 J95 Great Shefford 1341
8 F51 Pan-STARRS 1, Haleakala 1264
9 L01 Visnjan Observatory, Tican 1151
10 V06 Catalina Sky Survey-Kuiper 974

Top MPEC-ed Precoverers

Last 1 year (2025-02-22 to 2026-02-22)

# Observatory Total MPECs
1 I41 Palomar Mountain--ZTF 388
2 F51 Pan-STARRS 1, Haleakala 135
3 G96 Mt. Lemmon Survey 106
4 F52 Pan-STARRS 2, Haleakala 80
5 703 Catalina Sky Survey 36
6 W84 Cerro Tololo-DECam 8
7 M22 ATLAS South Africa, Sutherland 8
8 U68 JPL SynTrack Robotic Telescope, Auberry 7
9 V00 Kitt Peak-Bok 7
10 T09 Subaru Telescope, Maunakea 5

Last 5 years (2021-02-23 to 2026-02-22)

# Observatory Total MPECs
1 F51 Pan-STARRS 1, Haleakala 710
2 F52 Pan-STARRS 2, Haleakala 657
3 G96 Mt. Lemmon Survey 589
4 I41 Palomar Mountain--ZTF 440
5 703 Catalina Sky Survey 267
6 W84 Cerro Tololo-DECam 43
7 T14 Canada-France-Hawaii Telescope, Maunakea 33
8 V00 Kitt Peak-Bok 33
9 K88 GINOP-KHK, Piszkesteto 27
10 W68 ATLAS Chile, Rio Hurtado 19

All time (since 1993-09-19)

# Observatory Total MPECs
1 F51 Pan-STARRS 1, Haleakala 1539
2 F52 Pan-STARRS 2, Haleakala 1149
3 G96 Mt. Lemmon Survey 777
4 I41 Palomar Mountain--ZTF 467
5 703 Catalina Sky Survey 375
6 704 Lincoln Laboratory ETS, New Mexico 70
7 W84 Cerro Tololo-DECam 54
8 691 Steward Observatory, Kitt Peak-Spacewatch 44
9 T14 Canada-France-Hawaii Telescope, Maunakea 33
10 V00 Kitt Peak-Bok 33

Top MPEC-ed Recoverers of Single Opposition Objects

Last 1 year (2025-02-22 to 2026-02-22)

# Observatory Total MPECs
1 F51 Pan-STARRS 1, Haleakala 328
2 F52 Pan-STARRS 2, Haleakala 232
3 I52 Steward Observatory, Mt. Lemmon Station 129
4 G96 Mt. Lemmon Survey 111
5 T12 University of Hawaii 88-inch telescope, Maunakea 79
6 V06 Catalina Sky Survey-Kuiper 70
7 T14 Canada-France-Hawaii Telescope, Maunakea 54
8 V00 Kitt Peak-Bok 54
9 807 Cerro Tololo Observatory, La Serena 49
10 T09 Subaru Telescope, Maunakea 48

Last 5 years (2021-02-23 to 2026-02-22)

# Observatory Total MPECs
1 F51 Pan-STARRS 1, Haleakala 1590
2 F52 Pan-STARRS 2, Haleakala 1056
3 G96 Mt. Lemmon Survey 649
4 I52 Steward Observatory, Mt. Lemmon Station 625
5 T12 University of Hawaii 88-inch telescope, Maunakea 361
6 W84 Cerro Tololo-DECam 313
7 V06 Catalina Sky Survey-Kuiper 313
8 T09 Subaru Telescope, Maunakea 282
9 T14 Canada-France-Hawaii Telescope, Maunakea 274
10 807 Cerro Tololo Observatory, La Serena 214

All time (since 1993-09-19)

# Observatory Total MPECs
1 F51 Pan-STARRS 1, Haleakala 3135
2 G96 Mt. Lemmon Survey 1794
3 213 Observatorio Montcabre 1553
4 349 Ageo 1476
5 568 Maunakea 1373
6 F52 Pan-STARRS 2, Haleakala 1282
7 704 Lincoln Laboratory ETS, New Mexico 1270
8 703 Catalina Sky Survey 1205
9 204 Schiaparelli Observatory 1092
10 I52 Steward Observatory, Mt. Lemmon Station 965

Top MPEC-ed First Sighters in Recovery of Single Opposition Objects

Last 1 year (2025-02-22 to 2026-02-22)

# Observatory Total MPECs
1 F51 Pan-STARRS 1, Haleakala 229
2 F52 Pan-STARRS 2, Haleakala 87
3 G96 Mt. Lemmon Survey 39
4 I52 Steward Observatory, Mt. Lemmon Station 34
5 T09 Subaru Telescope, Maunakea 33
6 T14 Canada-France-Hawaii Telescope, Maunakea 28
7 T12 University of Hawaii 88-inch telescope, Maunakea 27
8 V06 Catalina Sky Survey-Kuiper 17
9 V00 Kitt Peak-Bok 17
10 I41 Palomar Mountain--ZTF 12

Last 5 years (2021-02-23 to 2026-02-22)

# Observatory Total MPECs
1 F51 Pan-STARRS 1, Haleakala 1126
2 F52 Pan-STARRS 2, Haleakala 368
3 G96 Mt. Lemmon Survey 277
4 T09 Subaru Telescope, Maunakea 199
5 I52 Steward Observatory, Mt. Lemmon Station 150
6 T14 Canada-France-Hawaii Telescope, Maunakea 145
7 W84 Cerro Tololo-DECam 113
8 T12 University of Hawaii 88-inch telescope, Maunakea 113
9 V06 Catalina Sky Survey-Kuiper 82
10 266 New Horizons KBO Search-Subaru 62

All time (since 1993-09-19)

# Observatory Total MPECs
1 F51 Pan-STARRS 1, Haleakala 2329
2 568 Maunakea 887
3 G96 Mt. Lemmon Survey 664
4 249 SOHO 606
5 F52 Pan-STARRS 2, Haleakala 441
6 704 Lincoln Laboratory ETS, New Mexico 414
7 807 Cerro Tololo Observatory, La Serena 342
8 T12 University of Hawaii 88-inch telescope, Maunakea 316
9 703 Catalina Sky Survey 314
10 349 Ageo 297