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 2024-10-04 04:35:57

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.
2024 3246 4 2211 750 278 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 (2023-10-05 to 2024-10-04)

# Observatory Total MPECs
1 F51 Pan-STARRS 1, Haleakala 1839
2 F52 Pan-STARRS 2, Haleakala 1828
3 I52 Steward Observatory, Mt. Lemmon Station 1821
4 G96 Mt. Lemmon Survey 1576
5 H21 Astronomical Research Observatory, Westfield 1241
6 H01 Magdalena Ridge Observatory, Socorro 797
7 L01 Visnjan Observatory, Tican 707
8 033 Karl Schwarzschild Observatory, Tautenburg 556
9 807 Cerro Tololo Observatory, La Serena 551
10 I93 St Pardon de Conques 522

Last 5 years (2019-10-06 to 2024-10-04)

# Observatory Total MPECs
1 I52 Steward Observatory, Mt. Lemmon Station 9500
2 F51 Pan-STARRS 1, Haleakala 8903
3 G96 Mt. Lemmon Survey 8902
4 F52 Pan-STARRS 2, Haleakala 7354
5 H21 Astronomical Research Observatory, Westfield 5994
6 L01 Visnjan Observatory, Tican 5546
7 033 Karl Schwarzschild Observatory, Tautenburg 3992
8 807 Cerro Tololo Observatory, La Serena 3698
9 J95 Great Shefford 2709
10 703 Catalina Sky Survey 2601

All time (since 1993-09-19)

# Observatory Total MPECs
1 G96 Mt. Lemmon Survey 20519
2 F51 Pan-STARRS 1, Haleakala 18619
3 I52 Steward Observatory, Mt. Lemmon Station 14452
4 H21 Astronomical Research Observatory, Westfield 13691
5 291 LPL/Spacewatch II 10788
6 703 Catalina Sky Survey 10023
7 J95 Great Shefford 9398
8 807 Cerro Tololo Observatory, La Serena 8441
9 F52 Pan-STARRS 2, Haleakala 8081
10 568 Maunakea 8018

Top MPEC-ed Discoverers

Last 1 year (2023-10-05 to 2024-10-04)

# Observatory Total MPECs
1 G96 Mt. Lemmon Survey 887
2 F52 Pan-STARRS 2, Haleakala 788
3 F51 Pan-STARRS 1, Haleakala 602
4 V00 Kitt Peak-Bok 162
5 703 Catalina Sky Survey 143
6 T09 Subaru Telescope, Maunakea 102
7 L51 MARGO, Nauchnyi 71
8 K88 GINOP-KHK, Piszkesteto 63
9 W68 ATLAS Chile, Rio Hurtado 59
10 T05 ATLAS-HKO, Haleakala 42

Last 5 years (2019-10-06 to 2024-10-04)

# Observatory Total MPECs
1 G96 Mt. Lemmon Survey 5667
2 F51 Pan-STARRS 1, Haleakala 3551
3 F52 Pan-STARRS 2, Haleakala 2879
4 703 Catalina Sky Survey 691
5 V00 Kitt Peak-Bok 619
6 T08 ATLAS-MLO, Mauna Loa 336
7 T05 ATLAS-HKO, Haleakala 257
8 K88 GINOP-KHK, Piszkesteto 232
9 W94 MAP, San Pedro de Atacama 221
10 I41 Palomar Mountain--ZTF 186

All time (since 1993-09-19)

# Observatory Total MPECs
1 G96 Mt. Lemmon Survey 12122
2 F51 Pan-STARRS 1, Haleakala 9104
3 703 Catalina Sky Survey 3715
4 F52 Pan-STARRS 2, Haleakala 3104
5 704 Lincoln Laboratory ETS, New Mexico 2643
6 691 Steward Observatory, Kitt Peak-Spacewatch 897
7 568 Maunakea 753
8 V00 Kitt Peak-Bok 619
9 T08 ATLAS-MLO, Mauna Loa 535
10 E12 Siding Spring Survey 506

Top MPEC-ed Follow-up Observatories

Last 1 year (2023-10-05 to 2024-10-04)

# Observatory Total MPECs
1 I52 Steward Observatory, Mt. Lemmon Station 1472
2 H21 Astronomical Research Observatory, Westfield 1005
3 H01 Magdalena Ridge Observatory, Socorro 752
4 L01 Visnjan Observatory, Tican 671
5 F51 Pan-STARRS 1, Haleakala 584
6 F52 Pan-STARRS 2, Haleakala 486
7 I93 St Pardon de Conques 475
8 033 Karl Schwarzschild Observatory, Tautenburg 469
9 958 Observatoire de Dax 407
10 858 Tebbutt Observatory, Edgewood 402

Last 5 years (2019-10-06 to 2024-10-04)

# Observatory Total MPECs
1 I52 Steward Observatory, Mt. Lemmon Station 7804
2 L01 Visnjan Observatory, Tican 5139
3 H21 Astronomical Research Observatory, Westfield 4833
4 033 Karl Schwarzschild Observatory, Tautenburg 3350
5 807 Cerro Tololo Observatory, La Serena 2654
6 I93 St Pardon de Conques 2356
7 F51 Pan-STARRS 1, Haleakala 2313
8 F52 Pan-STARRS 2, Haleakala 2129
9 J95 Great Shefford 1984
10 H01 Magdalena Ridge Observatory, Socorro 1868

All time (since 1993-09-19)

# Observatory Total MPECs
1 I52 Steward Observatory, Mt. Lemmon Station 11860
2 H21 Astronomical Research Observatory, Westfield 9570
3 L01 Visnjan Observatory, Tican 6752
4 J95 Great Shefford 6084
5 H01 Magdalena Ridge Observatory, Socorro 6052
6 291 LPL/Spacewatch II 5806
7 807 Cerro Tololo Observatory, La Serena 5089
8 033 Karl Schwarzschild Observatory, Tautenburg 4326
9 568 Maunakea 3719
10 H36 Sandlot Observatory, Scranton 3698

Top MPEC-ed First Follow-up Observatories

Last 1 year (2023-10-05 to 2024-10-04)

# Observatory Total MPECs
1 I52 Steward Observatory, Mt. Lemmon Station 679
2 H01 Magdalena Ridge Observatory, Socorro 361
3 F51 Pan-STARRS 1, Haleakala 245
4 F52 Pan-STARRS 2, Haleakala 175
5 V06 Catalina Sky Survey-Kuiper 116
6 L01 Visnjan Observatory, Tican 107
7 H21 Astronomical Research Observatory, Westfield 100
8 X09 Deep Random Survey, Rio Hurtado 83
9 291 LPL/Spacewatch II 80
10 807 Cerro Tololo Observatory, La Serena 79

Last 5 years (2019-10-06 to 2024-10-04)

# Observatory Total MPECs
1 I52 Steward Observatory, Mt. Lemmon Station 4424
2 H01 Magdalena Ridge Observatory, Socorro 915
3 L01 Visnjan Observatory, Tican 910
4 F51 Pan-STARRS 1, Haleakala 822
5 807 Cerro Tololo Observatory, La Serena 794
6 V06 Catalina Sky Survey-Kuiper 719
7 033 Karl Schwarzschild Observatory, Tautenburg 685
8 F52 Pan-STARRS 2, Haleakala 663
9 568 Maunakea 595
10 H21 Astronomical Research Observatory, Westfield 560

All time (since 1993-09-19)

# Observatory Total MPECs
1 I52 Steward Observatory, Mt. Lemmon Station 6218
2 H01 Magdalena Ridge Observatory, Socorro 2958
3 291 LPL/Spacewatch II 2377
4 H21 Astronomical Research Observatory, Westfield 1775
5 568 Maunakea 1698
6 807 Cerro Tololo Observatory, La Serena 1638
7 J95 Great Shefford 1396
8 L01 Visnjan Observatory, Tican 1174
9 F51 Pan-STARRS 1, Haleakala 949
10 033 Karl Schwarzschild Observatory, Tautenburg 884

Top MPEC-ed Precoverers

Last 1 year (2023-10-05 to 2024-10-04)

# Observatory Total MPECs
1 F51 Pan-STARRS 1, Haleakala 213
2 F52 Pan-STARRS 2, Haleakala 195
3 G96 Mt. Lemmon Survey 133
4 703 Catalina Sky Survey 47
5 T14 Canada-France-Hawaii Telescope, Maunakea 18
6 W84 Cerro Tololo-DECam 18
7 I41 Palomar Mountain--ZTF 12
8 V00 Kitt Peak-Bok 7
9 U68 JPL SynTrack Robotic Telescope, Auberry 4
10 695 Kitt Peak 3

Last 5 years (2019-10-06 to 2024-10-04)

# Observatory Total MPECs
1 F51 Pan-STARRS 1, Haleakala 1001
2 F52 Pan-STARRS 2, Haleakala 972
3 G96 Mt. Lemmon Survey 583
4 703 Catalina Sky Survey 279
5 I41 Palomar Mountain--ZTF 78
6 W84 Cerro Tololo-DECam 33
7 K88 GINOP-KHK, Piszkesteto 29
8 T14 Canada-France-Hawaii Telescope, Maunakea 24
9 V00 Kitt Peak-Bok 19
10 W68 ATLAS Chile, Rio Hurtado 16

All time (since 1993-09-19)

# Observatory Total MPECs
1 F51 Pan-STARRS 1, Haleakala 1505
2 F52 Pan-STARRS 2, Haleakala 1115
3 G96 Mt. Lemmon Survey 659
4 703 Catalina Sky Survey 329
5 I41 Palomar Mountain--ZTF 96
6 704 Lincoln Laboratory ETS, New Mexico 75
7 691 Steward Observatory, Kitt Peak-Spacewatch 48
8 W84 Cerro Tololo-DECam 41
9 K88 GINOP-KHK, Piszkesteto 30
10 699 Lowell Observatory-LONEOS 28

Top MPEC-ed Recoverers of Single Opposition Objects

Last 1 year (2023-10-05 to 2024-10-04)

# Observatory Total MPECs
1 F51 Pan-STARRS 1, Haleakala 349
2 F52 Pan-STARRS 2, Haleakala 252
3 T09 Subaru Telescope, Maunakea 191
4 G96 Mt. Lemmon Survey 182
5 I52 Steward Observatory, Mt. Lemmon Station 149
6 W84 Cerro Tololo-DECam 124
7 T12 University of Hawaii 88-inch telescope, Maunakea 117
8 T14 Canada-France-Hawaii Telescope, Maunakea 87
9 V06 Catalina Sky Survey-Kuiper 83
10 Z84 Calar Alto-Schmidt 56

Last 5 years (2019-10-06 to 2024-10-04)

# Observatory Total MPECs
1 F51 Pan-STARRS 1, Haleakala 1709
2 F52 Pan-STARRS 2, Haleakala 997
3 G96 Mt. Lemmon Survey 688
4 I52 Steward Observatory, Mt. Lemmon Station 591
5 T12 University of Hawaii 88-inch telescope, Maunakea 344
6 W84 Cerro Tololo-DECam 326
7 T14 Canada-France-Hawaii Telescope, Maunakea 247
8 V06 Catalina Sky Survey-Kuiper 243
9 807 Cerro Tololo Observatory, La Serena 217
10 T09 Subaru Telescope, Maunakea 207

All time (since 1993-09-19)

# Observatory Total MPECs
1 F51 Pan-STARRS 1, Haleakala 2848
2 G96 Mt. Lemmon Survey 1719
3 213 Observatorio Montcabre 1579
4 349 Ageo 1513
5 568 Maunakea 1455
6 704 Lincoln Laboratory ETS, New Mexico 1326
7 703 Catalina Sky Survey 1210
8 204 Schiaparelli Observatory 1072
9 F52 Pan-STARRS 2, Haleakala 1045
10 H06 iTelescope Observatory, Mayhill 976

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

Last 1 year (2023-10-05 to 2024-10-04)

# Observatory Total MPECs
1 F51 Pan-STARRS 1, Haleakala 207
2 T09 Subaru Telescope, Maunakea 143
3 F52 Pan-STARRS 2, Haleakala 105
4 G96 Mt. Lemmon Survey 90
5 W84 Cerro Tololo-DECam 54
6 I52 Steward Observatory, Mt. Lemmon Station 51
7 T14 Canada-France-Hawaii Telescope, Maunakea 51
8 T12 University of Hawaii 88-inch telescope, Maunakea 31
9 V06 Catalina Sky Survey-Kuiper 31
10 266 New Horizons KBO Search-Subaru 29

Last 5 years (2019-10-06 to 2024-10-04)

# Observatory Total MPECs
1 F51 Pan-STARRS 1, Haleakala 1292
2 F52 Pan-STARRS 2, Haleakala 325
3 G96 Mt. Lemmon Survey 293
4 T12 University of Hawaii 88-inch telescope, Maunakea 150
5 T09 Subaru Telescope, Maunakea 148
6 T14 Canada-France-Hawaii Telescope, Maunakea 141
7 W84 Cerro Tololo-DECam 134
8 I52 Steward Observatory, Mt. Lemmon Station 106
9 V06 Catalina Sky Survey-Kuiper 68
10 807 Cerro Tololo Observatory, La Serena 62

All time (since 1993-09-19)

# Observatory Total MPECs
1 F51 Pan-STARRS 1, Haleakala 2140
2 568 Maunakea 926
3 G96 Mt. Lemmon Survey 641
4 249 SOHO 622
5 704 Lincoln Laboratory ETS, New Mexico 425
6 807 Cerro Tololo Observatory, La Serena 347
7 F52 Pan-STARRS 2, Haleakala 341
8 703 Catalina Sky Survey 327
9 T12 University of Hawaii 88-inch telescope, Maunakea 309
10 349 Ageo 308