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 2025-05-20 04:45:51

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.
2025 1684 0 1198 346 139 0 1 0
2024 4756 6 3433 947 367 0 3 0
2023 4258 2 3185 700 366 0 5 0
2022 4360 1 3352 635 367 0 0 5
2021 4477 3 3339 761 366 0 0 8
2020 4019 0 3160 474 367 0 0 18
2019 3728 0 2582 777 360 0 1 8
2018 2790 0 1967 453 362 0 3 5
2017 3000 0 2197 438 362 0 0 3
2016 3198 0 2286 547 363 0 1 1
2015 2486 1 1660 457 364 0 4 0
2014 2170 1 1447 360 361 0 1 0
2013 1797 1 1089 352 354 0 0 1
2012 1729 1 1043 319 361 0 3 2
2011 1629 1 919 297 361 51 0 0
2010 2027 1 967 631 361 65 1 1
2009 1899 1 829 629 365 72 0 3
2008 1883 1 858 590 366 66 0 2
2007 1747 1 669 628 362 87 0 0
2006 1698 2 713 554 357 70 0 2
2005 1708 0 686 594 358 70 0 0
2004 1659 1 581 634 361 81 0 1
2003 1618 1 512 682 358 65 0 0
2002 1616 6 549 629 348 84 0 0
2001 1303 3 515 368 331 84 0 2
2000 1134 0 418 354 290 70 0 2
1999 898 2 323 176 324 73 0 0
1998 742 1 270 85 339 46 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 (2024-05-20 to 2025-05-20)

# Observatory Total MPECs
1 I52 Steward Observatory, Mt. Lemmon Station 2213
2 F52 Pan-STARRS 2, Haleakala 1847
3 F51 Pan-STARRS 1, Haleakala 1836
4 G96 Mt. Lemmon Survey 1711
5 H21 Astronomical Research Observatory, Westfield 1320
6 807 Cerro Tololo Observatory, La Serena 816
7 L01 Visnjan Observatory, Tican 743
8 033 Karl Schwarzschild Observatory, Tautenburg 685
9 H01 Magdalena Ridge Observatory, Socorro 631
10 M45 Starhopper Observatory, Sfantu Gheorghe 581

Last 5 years (2020-05-21 to 2025-05-20)

# Observatory Total MPECs
1 I52 Steward Observatory, Mt. Lemmon Station 9869
2 G96 Mt. Lemmon Survey 8982
3 F51 Pan-STARRS 1, Haleakala 8797
4 F52 Pan-STARRS 2, Haleakala 7806
5 H21 Astronomical Research Observatory, Westfield 6192
6 L01 Visnjan Observatory, Tican 5097
7 807 Cerro Tololo Observatory, La Serena 4030
8 033 Karl Schwarzschild Observatory, Tautenburg 3712
9 703 Catalina Sky Survey 2719
10 I93 St Pardon de Conques 2673

All time (since 1993-09-19)

# Observatory Total MPECs
1 G96 Mt. Lemmon Survey 21856
2 F51 Pan-STARRS 1, Haleakala 19743
3 I52 Steward Observatory, Mt. Lemmon Station 16203
4 H21 Astronomical Research Observatory, Westfield 14554
5 291 LPL/Spacewatch II 11145
6 703 Catalina Sky Survey 10455
7 J95 Great Shefford 9716
8 F52 Pan-STARRS 2, Haleakala 9205
9 807 Cerro Tololo Observatory, La Serena 9062
10 568 Maunakea 8024

Top MPEC-ed Discoverers

Last 1 year (2024-05-20 to 2025-05-20)

# Observatory Total MPECs
1 G96 Mt. Lemmon Survey 1014
2 F52 Pan-STARRS 2, Haleakala 861
3 F51 Pan-STARRS 1, Haleakala 521
4 V00 Kitt Peak-Bok 320
5 703 Catalina Sky Survey 177
6 T09 Subaru Telescope, Maunakea 122
7 K88 GINOP-KHK, Piszkesteto 71
8 W68 ATLAS Chile, Rio Hurtado 62
9 T08 ATLAS-MLO, Mauna Loa 62
10 L51 MARGO, Nauchnyi 53

Last 5 years (2020-05-21 to 2025-05-20)

# Observatory Total MPECs
1 G96 Mt. Lemmon Survey 5509
2 F51 Pan-STARRS 1, Haleakala 3335
3 F52 Pan-STARRS 2, Haleakala 3218
4 V00 Kitt Peak-Bok 922
5 703 Catalina Sky Survey 716
6 T08 ATLAS-MLO, Mauna Loa 318
7 K88 GINOP-KHK, Piszkesteto 285
8 T05 ATLAS-HKO, Haleakala 245
9 W94 MAP, San Pedro de Atacama 242
10 I41 Palomar Mountain--ZTF 176

All time (since 1993-09-19)

# Observatory Total MPECs
1 G96 Mt. Lemmon Survey 12936
2 F51 Pan-STARRS 1, Haleakala 9394
3 703 Catalina Sky Survey 3859
4 F52 Pan-STARRS 2, Haleakala 3616
5 704 Lincoln Laboratory ETS, New Mexico 2643
6 V00 Kitt Peak-Bok 935
7 691 Steward Observatory, Kitt Peak-Spacewatch 897
8 568 Maunakea 754
9 T08 ATLAS-MLO, Mauna Loa 574
10 E12 Siding Spring Survey 506

Top MPEC-ed Follow-up Observatories

Last 1 year (2024-05-20 to 2025-05-20)

# Observatory Total MPECs
1 I52 Steward Observatory, Mt. Lemmon Station 1836
2 H21 Astronomical Research Observatory, Westfield 1091
3 L01 Visnjan Observatory, Tican 709
4 807 Cerro Tololo Observatory, La Serena 624
5 F51 Pan-STARRS 1, Haleakala 612
6 H01 Magdalena Ridge Observatory, Socorro 584
7 033 Karl Schwarzschild Observatory, Tautenburg 558
8 I93 St Pardon de Conques 500
9 204 Schiaparelli Observatory 426
10 M45 Starhopper Observatory, Sfantu Gheorghe 401

Last 5 years (2020-05-21 to 2025-05-20)

# Observatory Total MPECs
1 I52 Steward Observatory, Mt. Lemmon Station 8089
2 H21 Astronomical Research Observatory, Westfield 5102
3 L01 Visnjan Observatory, Tican 4752
4 033 Karl Schwarzschild Observatory, Tautenburg 3070
5 807 Cerro Tololo Observatory, La Serena 2919
6 I93 St Pardon de Conques 2468
7 F51 Pan-STARRS 1, Haleakala 2350
8 F52 Pan-STARRS 2, Haleakala 2077
9 J95 Great Shefford 1905
10 204 Schiaparelli Observatory 1850

All time (since 1993-09-19)

# Observatory Total MPECs
1 I52 Steward Observatory, Mt. Lemmon Station 13326
2 H21 Astronomical Research Observatory, Westfield 10305
3 L01 Visnjan Observatory, Tican 7263
4 H01 Magdalena Ridge Observatory, Socorro 6410
5 J95 Great Shefford 6322
6 291 LPL/Spacewatch II 6011
7 807 Cerro Tololo Observatory, La Serena 5566
8 033 Karl Schwarzschild Observatory, Tautenburg 4722
9 I93 St Pardon de Conques 3987
10 H36 Sandlot Observatory, Scranton 3806

Top MPEC-ed First Follow-up Observatories

Last 1 year (2024-05-20 to 2025-05-20)

# Observatory Total MPECs
1 I52 Steward Observatory, Mt. Lemmon Station 942
2 H01 Magdalena Ridge Observatory, Socorro 289
3 F51 Pan-STARRS 1, Haleakala 280
4 F52 Pan-STARRS 2, Haleakala 160
5 807 Cerro Tololo Observatory, La Serena 127
6 291 LPL/Spacewatch II 127
7 V06 Catalina Sky Survey-Kuiper 125
8 033 Karl Schwarzschild Observatory, Tautenburg 101
9 T14 Canada-France-Hawaii Telescope, Maunakea 101
10 L01 Visnjan Observatory, Tican 80

Last 5 years (2020-05-21 to 2025-05-20)

# Observatory Total MPECs
1 I52 Steward Observatory, Mt. Lemmon Station 4601
2 F51 Pan-STARRS 1, Haleakala 953
3 H01 Magdalena Ridge Observatory, Socorro 844
4 807 Cerro Tololo Observatory, La Serena 814
5 L01 Visnjan Observatory, Tican 807
6 V06 Catalina Sky Survey-Kuiper 731
7 F52 Pan-STARRS 2, Haleakala 706
8 033 Karl Schwarzschild Observatory, Tautenburg 566
9 H21 Astronomical Research Observatory, Westfield 547
10 568 Maunakea 531

All time (since 1993-09-19)

# Observatory Total MPECs
1 I52 Steward Observatory, Mt. Lemmon Station 7021
2 H01 Magdalena Ridge Observatory, Socorro 3144
3 291 LPL/Spacewatch II 2492
4 H21 Astronomical Research Observatory, Westfield 1805
5 807 Cerro Tololo Observatory, La Serena 1731
6 568 Maunakea 1699
7 J95 Great Shefford 1420
8 L01 Visnjan Observatory, Tican 1223
9 F51 Pan-STARRS 1, Haleakala 1126
10 V06 Catalina Sky Survey-Kuiper 948

Top MPEC-ed Precoverers

Last 1 year (2024-05-20 to 2025-05-20)

# Observatory Total MPECs
1 F51 Pan-STARRS 1, Haleakala 183
2 G96 Mt. Lemmon Survey 158
3 F52 Pan-STARRS 2, Haleakala 133
4 703 Catalina Sky Survey 52
5 W84 Cerro Tololo-DECam 28
6 T14 Canada-France-Hawaii Telescope, Maunakea 23
7 I41 Palomar Mountain--ZTF 18
8 V00 Kitt Peak-Bok 13
9 T09 Subaru Telescope, Maunakea 8
10 T08 ATLAS-MLO, Mauna Loa 5

Last 5 years (2020-05-21 to 2025-05-20)

# Observatory Total MPECs
1 F51 Pan-STARRS 1, Haleakala 876
2 F52 Pan-STARRS 2, Haleakala 869
3 G96 Mt. Lemmon Survey 691
4 703 Catalina Sky Survey 318
5 I41 Palomar Mountain--ZTF 88
6 W84 Cerro Tololo-DECam 45
7 T14 Canada-France-Hawaii Telescope, Maunakea 33
8 K88 GINOP-KHK, Piszkesteto 30
9 V00 Kitt Peak-Bok 30
10 W68 ATLAS Chile, Rio Hurtado 17

All time (since 1993-09-19)

# Observatory Total MPECs
1 F51 Pan-STARRS 1, Haleakala 1599
2 F52 Pan-STARRS 2, Haleakala 1186
3 G96 Mt. Lemmon Survey 772
4 703 Catalina Sky Survey 369
5 I41 Palomar Mountain--ZTF 108
6 704 Lincoln Laboratory ETS, New Mexico 75
7 W84 Cerro Tololo-DECam 54
8 691 Steward Observatory, Kitt Peak-Spacewatch 48
9 T14 Canada-France-Hawaii Telescope, Maunakea 33
10 K88 GINOP-KHK, Piszkesteto 31

Top MPEC-ed Recoverers of Single Opposition Objects

Last 1 year (2024-05-20 to 2025-05-20)

# Observatory Total MPECs
1 F51 Pan-STARRS 1, Haleakala 392
2 F52 Pan-STARRS 2, Haleakala 282
3 G96 Mt. Lemmon Survey 150
4 T09 Subaru Telescope, Maunakea 148
5 I52 Steward Observatory, Mt. Lemmon Station 144
6 W84 Cerro Tololo-DECam 89
7 T14 Canada-France-Hawaii Telescope, Maunakea 88
8 V06 Catalina Sky Survey-Kuiper 84
9 T12 University of Hawaii 88-inch telescope, Maunakea 79
10 204 Schiaparelli Observatory 53

Last 5 years (2020-05-21 to 2025-05-20)

# Observatory Total MPECs
1 F51 Pan-STARRS 1, Haleakala 1753
2 F52 Pan-STARRS 2, Haleakala 1115
3 G96 Mt. Lemmon Survey 733
4 I52 Steward Observatory, Mt. Lemmon Station 648
5 T12 University of Hawaii 88-inch telescope, Maunakea 353
6 W84 Cerro Tololo-DECam 352
7 V06 Catalina Sky Survey-Kuiper 301
8 T14 Canada-France-Hawaii Telescope, Maunakea 282
9 T09 Subaru Telescope, Maunakea 253
10 807 Cerro Tololo Observatory, La Serena 232

All time (since 1993-09-19)

# Observatory Total MPECs
1 F51 Pan-STARRS 1, Haleakala 3115
2 G96 Mt. Lemmon Survey 1830
3 213 Observatorio Montcabre 1591
4 349 Ageo 1527
5 568 Maunakea 1456
6 704 Lincoln Laboratory ETS, New Mexico 1327
7 703 Catalina Sky Survey 1249
8 F52 Pan-STARRS 2, Haleakala 1221
9 204 Schiaparelli Observatory 1114
10 H06 iTelescope Observatory, Mayhill 976

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

Last 1 year (2024-05-20 to 2025-05-20)

# Observatory Total MPECs
1 F51 Pan-STARRS 1, Haleakala 270
2 F52 Pan-STARRS 2, Haleakala 112
3 T09 Subaru Telescope, Maunakea 112
4 G96 Mt. Lemmon Survey 64
5 T14 Canada-France-Hawaii Telescope, Maunakea 48
6 266 New Horizons KBO Search-Subaru 33
7 W84 Cerro Tololo-DECam 32
8 I52 Steward Observatory, Mt. Lemmon Station 29
9 T12 University of Hawaii 88-inch telescope, Maunakea 22
10 V06 Catalina Sky Survey-Kuiper 19

Last 5 years (2020-05-21 to 2025-05-20)

# Observatory Total MPECs
1 F51 Pan-STARRS 1, Haleakala 1283
2 F52 Pan-STARRS 2, Haleakala 370
3 G96 Mt. Lemmon Survey 320
4 T09 Subaru Telescope, Maunakea 177
5 T14 Canada-France-Hawaii Telescope, Maunakea 155
6 W84 Cerro Tololo-DECam 135
7 I52 Steward Observatory, Mt. Lemmon Station 125
8 T12 University of Hawaii 88-inch telescope, Maunakea 124
9 V06 Catalina Sky Survey-Kuiper 80
10 266 New Horizons KBO Search-Subaru 66

All time (since 1993-09-19)

# Observatory Total MPECs
1 F51 Pan-STARRS 1, Haleakala 2331
2 568 Maunakea 927
3 G96 Mt. Lemmon Survey 687
4 249 SOHO 622
5 704 Lincoln Laboratory ETS, New Mexico 425
6 F52 Pan-STARRS 2, Haleakala 408
7 807 Cerro Tololo Observatory, La Serena 351
8 703 Catalina Sky Survey 331
9 T12 University of Hawaii 88-inch telescope, Maunakea 323
10 349 Ageo 309