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 2025-04-21 04:45:34

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 1406 0 1003 292 110 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 (2024-04-21 to 2025-04-21)

# Observatory Total MPECs
1 I52 Steward Observatory, Mt. Lemmon Station 2264
2 F52 Pan-STARRS 2, Haleakala 1872
3 F51 Pan-STARRS 1, Haleakala 1853
4 G96 Mt. Lemmon Survey 1729
5 H21 Astronomical Research Observatory, Westfield 1338
6 807 Cerro Tololo Observatory, La Serena 754
7 033 Karl Schwarzschild Observatory, Tautenburg 740
8 L01 Visnjan Observatory, Tican 697
9 H01 Magdalena Ridge Observatory, Socorro 596
10 M45 Starhopper Observatory, Sfantu Gheorghe 591

Last 5 years (2020-04-22 to 2025-04-21)

# Observatory Total MPECs
1 I52 Steward Observatory, Mt. Lemmon Station 9938
2 G96 Mt. Lemmon Survey 9023
3 F51 Pan-STARRS 1, Haleakala 8865
4 F52 Pan-STARRS 2, Haleakala 7842
5 H21 Astronomical Research Observatory, Westfield 6204
6 L01 Visnjan Observatory, Tican 5152
7 807 Cerro Tololo Observatory, La Serena 3964
8 033 Karl Schwarzschild Observatory, Tautenburg 3834
9 703 Catalina Sky Survey 2703
10 I93 St Pardon de Conques 2690

All time (since 1993-09-19)

# Observatory Total MPECs
1 G96 Mt. Lemmon Survey 21733
2 F51 Pan-STARRS 1, Haleakala 19634
3 I52 Steward Observatory, Mt. Lemmon Station 16051
4 H21 Astronomical Research Observatory, Westfield 14491
5 291 LPL/Spacewatch II 11113
6 703 Catalina Sky Survey 10399
7 J95 Great Shefford 9671
8 F52 Pan-STARRS 2, Haleakala 9125
9 807 Cerro Tololo Observatory, La Serena 8994
10 568 Maunakea 8023

Top MPEC-ed Discoverers

Last 1 year (2024-04-21 to 2025-04-21)

# Observatory Total MPECs
1 G96 Mt. Lemmon Survey 1022
2 F52 Pan-STARRS 2, Haleakala 885
3 F51 Pan-STARRS 1, Haleakala 538
4 V00 Kitt Peak-Bok 310
5 703 Catalina Sky Survey 172
6 T09 Subaru Telescope, Maunakea 140
7 K88 GINOP-KHK, Piszkesteto 72
8 W68 ATLAS Chile, Rio Hurtado 60
9 T08 ATLAS-MLO, Mauna Loa 60
10 L51 MARGO, Nauchnyi 59

Last 5 years (2020-04-22 to 2025-04-21)

# Observatory Total MPECs
1 G96 Mt. Lemmon Survey 5552
2 F51 Pan-STARRS 1, Haleakala 3402
3 F52 Pan-STARRS 2, Haleakala 3229
4 V00 Kitt Peak-Bok 906
5 703 Catalina Sky Survey 713
6 T08 ATLAS-MLO, Mauna Loa 318
7 K88 GINOP-KHK, Piszkesteto 280
8 T05 ATLAS-HKO, Haleakala 250
9 W94 MAP, San Pedro de Atacama 236
10 I41 Palomar Mountain--ZTF 176

All time (since 1993-09-19)

# Observatory Total MPECs
1 G96 Mt. Lemmon Survey 12870
2 F51 Pan-STARRS 1, Haleakala 9368
3 703 Catalina Sky Survey 3841
4 F52 Pan-STARRS 2, Haleakala 3590
5 704 Lincoln Laboratory ETS, New Mexico 2643
6 V00 Kitt Peak-Bok 919
7 691 Steward Observatory, Kitt Peak-Spacewatch 897
8 568 Maunakea 754
9 T08 ATLAS-MLO, Mauna Loa 571
10 E12 Siding Spring Survey 506

Top MPEC-ed Follow-up Observatories

Last 1 year (2024-04-21 to 2025-04-21)

# Observatory Total MPECs
1 I52 Steward Observatory, Mt. Lemmon Station 1874
2 H21 Astronomical Research Observatory, Westfield 1110
3 L01 Visnjan Observatory, Tican 664
4 F51 Pan-STARRS 1, Haleakala 626
5 033 Karl Schwarzschild Observatory, Tautenburg 612
6 807 Cerro Tololo Observatory, La Serena 575
7 H01 Magdalena Ridge Observatory, Socorro 552
8 I93 St Pardon de Conques 508
9 M45 Starhopper Observatory, Sfantu Gheorghe 413
10 958 Observatoire de Dax 410

Last 5 years (2020-04-22 to 2025-04-21)

# Observatory Total MPECs
1 I52 Steward Observatory, Mt. Lemmon Station 8157
2 H21 Astronomical Research Observatory, Westfield 5104
3 L01 Visnjan Observatory, Tican 4797
4 033 Karl Schwarzschild Observatory, Tautenburg 3186
5 807 Cerro Tololo Observatory, La Serena 2866
6 I93 St Pardon de Conques 2480
7 F51 Pan-STARRS 1, Haleakala 2366
8 F52 Pan-STARRS 2, Haleakala 2105
9 J95 Great Shefford 1918
10 204 Schiaparelli Observatory 1829

All time (since 1993-09-19)

# Observatory Total MPECs
1 I52 Steward Observatory, Mt. Lemmon Station 13207
2 H21 Astronomical Research Observatory, Westfield 10257
3 L01 Visnjan Observatory, Tican 7196
4 H01 Magdalena Ridge Observatory, Socorro 6344
5 J95 Great Shefford 6288
6 291 LPL/Spacewatch II 5999
7 807 Cerro Tololo Observatory, La Serena 5513
8 033 Karl Schwarzschild Observatory, Tautenburg 4706
9 I93 St Pardon de Conques 3950
10 H36 Sandlot Observatory, Scranton 3793

Top MPEC-ed First Follow-up Observatories

Last 1 year (2024-04-21 to 2025-04-21)

# Observatory Total MPECs
1 I52 Steward Observatory, Mt. Lemmon Station 968
2 F51 Pan-STARRS 1, Haleakala 290
3 H01 Magdalena Ridge Observatory, Socorro 275
4 F52 Pan-STARRS 2, Haleakala 169
5 291 LPL/Spacewatch II 128
6 807 Cerro Tololo Observatory, La Serena 124
7 V06 Catalina Sky Survey-Kuiper 123
8 033 Karl Schwarzschild Observatory, Tautenburg 103
9 T14 Canada-France-Hawaii Telescope, Maunakea 100
10 H21 Astronomical Research Observatory, Westfield 81

Last 5 years (2020-04-22 to 2025-04-21)

# Observatory Total MPECs
1 I52 Steward Observatory, Mt. Lemmon Station 4653
2 F51 Pan-STARRS 1, Haleakala 949
3 H01 Magdalena Ridge Observatory, Socorro 819
4 807 Cerro Tololo Observatory, La Serena 810
5 L01 Visnjan Observatory, Tican 809
6 V06 Catalina Sky Survey-Kuiper 758
7 F52 Pan-STARRS 2, Haleakala 707
8 033 Karl Schwarzschild Observatory, Tautenburg 587
9 H21 Astronomical Research Observatory, Westfield 553
10 568 Maunakea 543

All time (since 1993-09-19)

# Observatory Total MPECs
1 I52 Steward Observatory, Mt. Lemmon Station 6960
2 H01 Magdalena Ridge Observatory, Socorro 3119
3 291 LPL/Spacewatch II 2486
4 H21 Astronomical Research Observatory, Westfield 1804
5 807 Cerro Tololo Observatory, La Serena 1727
6 568 Maunakea 1699
7 J95 Great Shefford 1419
8 L01 Visnjan Observatory, Tican 1216
9 F51 Pan-STARRS 1, Haleakala 1115
10 033 Karl Schwarzschild Observatory, Tautenburg 937

Top MPEC-ed Precoverers

Last 1 year (2024-04-21 to 2025-04-21)

# Observatory Total MPECs
1 F51 Pan-STARRS 1, Haleakala 182
2 G96 Mt. Lemmon Survey 161
3 F52 Pan-STARRS 2, Haleakala 129
4 703 Catalina Sky Survey 54
5 W84 Cerro Tololo-DECam 27
6 T14 Canada-France-Hawaii Telescope, Maunakea 22
7 V00 Kitt Peak-Bok 13
8 I41 Palomar Mountain--ZTF 12
9 T09 Subaru Telescope, Maunakea 6
10 M22 ATLAS South Africa, Sutherland 5

Last 5 years (2020-04-22 to 2025-04-21)

# Observatory Total MPECs
1 F52 Pan-STARRS 2, Haleakala 892
2 F51 Pan-STARRS 1, Haleakala 891
3 G96 Mt. Lemmon Survey 681
4 703 Catalina Sky Survey 316
5 I41 Palomar Mountain--ZTF 81
6 W84 Cerro Tololo-DECam 45
7 T14 Canada-France-Hawaii Telescope, Maunakea 31
8 V00 Kitt Peak-Bok 30
9 K88 GINOP-KHK, Piszkesteto 30
10 W68 ATLAS Chile, Rio Hurtado 17

All time (since 1993-09-19)

# Observatory Total MPECs
1 F51 Pan-STARRS 1, Haleakala 1587
2 F52 Pan-STARRS 2, Haleakala 1178
3 G96 Mt. Lemmon Survey 762
4 703 Catalina Sky Survey 367
5 I41 Palomar Mountain--ZTF 101
6 704 Lincoln Laboratory ETS, New Mexico 75
7 W84 Cerro Tololo-DECam 53
8 691 Steward Observatory, Kitt Peak-Spacewatch 48
9 K88 GINOP-KHK, Piszkesteto 31
10 T14 Canada-France-Hawaii Telescope, Maunakea 31

Top MPEC-ed Recoverers of Single Opposition Objects

Last 1 year (2024-04-21 to 2025-04-21)

# Observatory Total MPECs
1 F51 Pan-STARRS 1, Haleakala 380
2 F52 Pan-STARRS 2, Haleakala 281
3 T09 Subaru Telescope, Maunakea 200
4 I52 Steward Observatory, Mt. Lemmon Station 153
5 G96 Mt. Lemmon Survey 153
6 V06 Catalina Sky Survey-Kuiper 97
7 W84 Cerro Tololo-DECam 90
8 T14 Canada-France-Hawaii Telescope, Maunakea 90
9 T12 University of Hawaii 88-inch telescope, Maunakea 86
10 204 Schiaparelli Observatory 50

Last 5 years (2020-04-22 to 2025-04-21)

# Observatory Total MPECs
1 F51 Pan-STARRS 1, Haleakala 1736
2 F52 Pan-STARRS 2, Haleakala 1107
3 G96 Mt. Lemmon Survey 729
4 I52 Steward Observatory, Mt. Lemmon Station 643
5 T12 University of Hawaii 88-inch telescope, Maunakea 362
6 W84 Cerro Tololo-DECam 343
7 V06 Catalina Sky Survey-Kuiper 300
8 T14 Canada-France-Hawaii Telescope, Maunakea 277
9 T09 Subaru Telescope, Maunakea 247
10 807 Cerro Tololo Observatory, La Serena 230

All time (since 1993-09-19)

# Observatory Total MPECs
1 F51 Pan-STARRS 1, Haleakala 3085
2 G96 Mt. Lemmon Survey 1817
3 213 Observatorio Montcabre 1589
4 349 Ageo 1525
5 568 Maunakea 1456
6 704 Lincoln Laboratory ETS, New Mexico 1326
7 703 Catalina Sky Survey 1243
8 F52 Pan-STARRS 2, Haleakala 1205
9 204 Schiaparelli Observatory 1111
10 H06 iTelescope Observatory, Mayhill 976

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

Last 1 year (2024-04-21 to 2025-04-21)

# Observatory Total MPECs
1 F51 Pan-STARRS 1, Haleakala 260
2 T09 Subaru Telescope, Maunakea 160
3 F52 Pan-STARRS 2, Haleakala 114
4 G96 Mt. Lemmon Survey 70
5 T14 Canada-France-Hawaii Telescope, Maunakea 48
6 I52 Steward Observatory, Mt. Lemmon Station 37
7 W84 Cerro Tololo-DECam 33
8 266 New Horizons KBO Search-Subaru 33
9 V06 Catalina Sky Survey-Kuiper 23
10 T12 University of Hawaii 88-inch telescope, Maunakea 22

Last 5 years (2020-04-22 to 2025-04-21)

# Observatory Total MPECs
1 F51 Pan-STARRS 1, Haleakala 1268
2 F52 Pan-STARRS 2, Haleakala 368
3 G96 Mt. Lemmon Survey 318
4 T09 Subaru Telescope, Maunakea 175
5 T14 Canada-France-Hawaii Telescope, Maunakea 152
6 T12 University of Hawaii 88-inch telescope, Maunakea 135
7 W84 Cerro Tololo-DECam 132
8 I52 Steward Observatory, Mt. Lemmon Station 125
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 2308
2 568 Maunakea 927
3 G96 Mt. Lemmon Survey 684
4 249 SOHO 622
5 704 Lincoln Laboratory ETS, New Mexico 425
6 F52 Pan-STARRS 2, Haleakala 403
7 807 Cerro Tololo Observatory, La Serena 351
8 703 Catalina Sky Survey 331
9 T12 University of Hawaii 88-inch telescope, Maunakea 322
10 349 Ageo 309