I11 Gemini South Observatory, Cerro Pachon

Graphs

Yearly Breakdown of MPEC Types

Term definition:
Editorial - Editorial MPECs associated with this station.
Discovery - MPECs associated with discovery made by this station.
OrbitUpdate - MPECs associated with orbit updates involving observations made by this station. Typically, these are recoveries of single-opposition objects.
DOU - Daily Orbit Update MPECs involving observations made by this station.
ListUpdate - MPECs associated with list updates involving observations made by this station. This category has largely been retired since 2012.
Retraction - Retracted MPECs involving observations made by this station.
Followup - MPECs associated with follow-up observations made by this station to an object discovered elsewhere.
FirstFollowup - MPECs associated with follow-up observations made by this station to an object discovered elsewhere, with this station being the first station to follow-up.
Other - MPECs that do not fit into categories listed above and involve observations made by this station.

Yearly Breakdown of Discovery Object Types

Yearly Breakdown of Orbit Update Object Types

Breakdown by Observers

Breakdown by Measurers

Breakdown by Facilities

Breakdown by Objects

Annual Breakdown

Weekly Breakdown

Hourly Breakdown

Tables

Yearly Breakdown of MPEC Types

Year Total MPECs Editorial Discovery Orbit Update DOU List Update Retraction Other Follow-Up First Follow-Up
2025 6 0 0 0 5 0 0 0 1 0
2024 2 0 0 2 0 0 0 0 0 0
2023 2 0 0 2 0 0 0 0 0 0
2022 4 0 0 2 1 0 0 0 1 0
2021 3 0 0 3 0 0 0 0 0 0
2020 1 0 0 0 0 0 0 0 1 0
2019 2 0 0 1 0 0 0 0 1 0
2018 5 0 0 0 1 0 0 0 4 0
2017 10 0 0 2 4 0 0 0 2 2
2016 20 0 0 2 4 0 0 0 11 3
2015 5 0 0 0 1 0 0 0 3 1
2014 11 0 0 0 4 0 0 0 6 1
2013 0 0 0 0 0 0 0 0 0 0
2012 0 0 0 0 0 0 0 0 0 0
2011 1 0 0 0 1 0 0 0 0 0
2010 11 0 0 1 2 0 0 0 4 4
2009 0 0 0 0 0 0 0 0 0 0
2008 0 0 0 0 0 0 0 0 0 0
2007 0 0 0 0 0 0 0 0 0 0
2006 0 0 0 0 0 0 0 0 0 0
2005 0 0 0 0 0 0 0 0 0 0
2004 0 0 0 0 0 0 0 0 0 0
2003 0 0 0 0 0 0 0 0 0 0
2002 0 0 0 0 0 0 0 0 0 0
2001 0 0 0 0 0 0 0 0 0 0
2000 0 0 0 0 0 0 0 0 0 0
1999 0 0 0 0 0 0 0 0 0 0
1998 0 0 0 0 0 0 0 0 0 0
1997 0 0 0 0 0 0 0 0 0 0
1996 0 0 0 0 0 0 0 0 0 0
1995 0 0 0 0 0 0 0 0 0 0
1994 0 0 0 0 0 0 0 0 0 0
1993 0 0 0 0 0 0 0 0 0 0

List of Individual MPECs

Index Name Date/Time Discoverer First-responding Confirmer Object Type Search Archival Image
1 MPEC 2010-G114 OBSERVATIONS OF COMETS 2010-04-14 20:57:00 Comet CATCH
2 MPEC 2010-N33 2009 ME10 2010-07-08 14:53:00 ✓ Unusual CATCH
3 MPEC 2010-N47 2009 MF10 2010-07-10 18:52:00 ✓ TNO CATCH
4 MPEC 2010-P22 2009 MG10 2010-08-04 23:23:00 ✓ TNO CATCH
5 MPEC 2010-S42 DAILY ORBIT UPDATE (2010 SEPT. 25 UT) 2010-09-25 06:09:00
6 MPEC 2010-Y06 2010 XP69 2010-12-16 16:14:00 ✓ PHAg18 CATCH
7 MPEC 2010-Y11 DAILY ORBIT UPDATE (2010 DEC. 18 UT) 2010-12-18 07:08:00
8 MPEC 2011-A29 DAILY ORBIT UPDATE (2011 JAN. 8 UT) 2011-01-08 07:10:00
9 MPEC 2014-C12 DAILY ORBIT UPDATE (2014 FEB. 5 UT) 2014-02-05 14:02:00
10 MPEC 2014-C21 DAILY ORBIT UPDATE (2014 FEB. 7 UT) 2014-02-07 14:03:00
11 MPEC 2014-E83 2014 EN45 2014-03-14 02:14:00 ✓ NEA (18>H>22) CATCH
12 MPEC 2014-H67 2014 HQ124 2014-04-28 18:01:00 PHAg18 CATCH
13 MPEC 2014-K11 DAILY ORBIT UPDATE (2014 MAY 18 UT) 2014-05-18 12:01:00
14 MPEC 2014-P58 2014 OT392 2014-08-13 22:08:00 NEA (H>22) CATCH
15 MPEC 2014-T49 2014 SR339 2014-10-07 14:04:00 PHAl18 CATCH
16 MPEC 2014-U19 2014 TJ64 2014-10-18 16:53:00 NEA (18>H>22) CATCH
17 MPEC 2014-U27 DAILY ORBIT UPDATE (2014 OCT. 21 UT) 2014-10-21 12:04:00
18 MPEC 2014-V53 2014 UH210 2014-11-14 04:00:00 NEA (18>H>22) CATCH
19 MPEC 2015-C52 2014 FC69 2015-02-11 16:26:00 TNO CATCH
20 MPEC 2015-H13 2015 FT344 2015-04-17 17:35:00 NEA (18>H>22) CATCH
21 MPEC 2015-L10 2015 KL157 2015-06-04 18:32:00 ✓ PHAg18 CATCH
22 MPEC 2015-O47 DAILY ORBIT UPDATE (2015 JULY 24 UT) 2015-07-24 12:03:00
23 MPEC 2016-B63 COMET C/2016 B1 (NEOWISE) 2016-01-22 19:20:00 Comet CATCH
24 MPEC 2016-D44 DAILY ORBIT UPDATE (2016 FEB. 25 UT) 2016-02-25 13:03:00
25 MPEC 2016-H25 DAILY ORBIT UPDATE (2016 APR. 19 UT) 2016-04-19 12:04:00
26 MPEC 2016-K35 DAILY ORBIT UPDATE (2016 MAY 29 UT) 2016-05-29 12:02:00
27 MPEC 2016-L71 2015 GP50 2016-06-07 20:03:00 TNO CATCH
28 MPEC 2016-P31 2016 OY2 2016-08-05 02:37:00 NEA (18>H>22) CATCH
29 MPEC 2016-Q40 2013 UH15 2016-08-29 13:37:00 ✓ TNO CATCH
30 MPEC 2016-Q43 2014 FE72 2016-08-29 13:43:00 TNO CATCH
31 MPEC 2016-Q48 2014 FL70 2016-08-29 15:52:00 TNO CATCH
32 MPEC 2016-Q67 2013 UJ15 2016-08-31 02:43:00 ✓ TNO CATCH
33 MPEC 2016-Q71 2014 FJ72 2016-08-31 02:52:00 TNO CATCH
34 MPEC 2016-Q73 2014 FL72 2016-08-31 02:58:00 TNO CATCH
35 MPEC 2016-Q78 2013 UK15 2016-08-31 03:44:00 ✓ TNO CATCH
36 MPEC 2016-Q79 2014 FM72 2016-08-31 03:46:00 TNO CATCH
37 MPEC 2016-R33 DAILY ORBIT UPDATE (2016 SEPT. 3 UT) 2016-09-03 12:03:00
38 MPEC 2016-T22 2016 SA36 2016-10-03 13:24:00 Unusual CATCH
39 MPEC 2016-Y80 2016 YF8 2016-12-29 14:35:00 NEA (H>22) CATCH
40 MPEC 2017-E98 DAILY ORBIT UPDATE (2017 MAR. 15 UT) 2017-03-15 12:03:00
41 MPEC 2017-G86 DAILY ORBIT UPDATE (2017 APR. 12 UT) 2017-04-12 12:02:00
42 MPEC 2017-L01 DAILY ORBIT UPDATE (2017 JUNE 1 UT) 2017-06-01 12:02:00
43 MPEC 2017-L52 OBSERVATIONS AND ORBITS OF COMETS 2017-06-06 22:36:00 Comet CATCH
44 MPEC 2017-O01 2017 MD9 2017-07-16 10:53:00 ✓ NEA (18>H>22) CATCH
45 MPEC 2017-O30 DAILY ORBIT UPDATE (2017 JULY 22 UT) 2017-07-22 11:59:00
46 MPEC 2017-Q01 2017 OP68 2017-08-16 02:00:00 ✓ PHAg18 CATCH
47 MPEC 2017-Q115 COMET P/2012 T1 = 2017 O3 (PANSTARRS) 2017-08-25 13:27:00 Comet CATCH
48 MPEC 2018-E26 2018 EB 2018-03-07 15:47:00 PHAg18 CATCH
49 MPEC 2018-E84 2015 FW403 2018-03-13 20:47:00 TNO CATCH
50 MPEC 2018-G01 DAILY ORBIT UPDATE (2018 APR. 1 UT) 2018-04-01 12:01:00
51 MPEC 2018-L30 2018 LK2 2018-06-08 18:18:00 NEA (18>H>22) CATCH
52 MPEC 2018-L53 COMET C/2018 EN4 (NEOWISE) 2018-06-11 14:52:00 Comet CATCH
53 MPEC 2019-Q09 COMET 39P/Oterma 2019-08-17 00:02:00 Comet CATCH
54 MPEC 2019-Q135 OBSERVATIONS AND ORBITS OF COMETS 2019-08-30 13:34:00 Comet CATCH
55 MPEC 2020-Q175 OBSERVATIONS AND ORBITS OF COMETS AND A/ OBJECTS 2020-08-24 17:36:00 Comet CATCH
56 MPEC 2021-F115 OBSERVATIONS AND ORBITS OF COMETS AND A/ OBJECTS 2021-03-26 04:20:00 Comet CATCH
57 MPEC 2021-P78 COMET P/2019 A7 = P/2021 K4 (PANSTARRS) 2021-08-08 00:04:00 Comet CATCH
58 MPEC 2021-P79 COMET P/2017 S5 = P/2021 L6 (ATLAS) 2021-08-08 04:22:00 Comet CATCH
59 MPEC 2022-H04 OBSERVATIONS AND ORBITS OF COMETS AND A/ OBJECTS 2022-04-17 04:45:00 Comet CATCH
60 MPEC 2022-P82 OBSERVATIONS AND ORBITS OF COMETS AND A/ OBJECTS 2022-08-06 07:59:00 Comet CATCH
61 MPEC 2022-W32 2019 RC 2022-11-17 14:07:00 PHAg18 CATCH
62 MPEC 2022-W161 DAILY ORBIT UPDATE (2022 November 24) 2022-11-24 12:18:00
63 MPEC 2023-E38 2015 NK13 2023-03-03 14:07:00 PHAg18 CATCH
64 MPEC 2023-O88 COMET P/2010 TO20 = P/2023 H6 (LINEAR-Grauer) 2023-07-27 02:57:00 Comet CATCH
65 MPEC 2024-E143 COMET P/2016 J1-B = P/2021 K5-B (PANSTARRS) 2024-03-11 08:00:00 Comet CATCH
66 MPEC 2024-L140 OBSERVATIONS AND ORBITS OF COMETS AND A/ OBJECTS 2024-06-14 22:23:00 Comet CATCH
67 MPEC 2025-C148 DAILY ORBIT UPDATE (2025 February 9) 2025-02-09 12:40:00
68 MPEC 2025-D145 DAILY ORBIT UPDATE (2025 February 24) 2025-02-24 12:19:00
69 MPEC 2025-J19 DAILY ORBIT UPDATE (2025 May 3) 2025-05-03 12:08:00
70 MPEC 2025-J44 DAILY ORBIT UPDATE (2025 May 5) 2025-05-05 12:13:00
71 MPEC 2025-S181 DAILY ORBIT UPDATE (2025 September 23) 2025-09-23 12:04:00
72 MPEC 2025-T164 2025 SC79 2025-10-15 16:05:00 NEA (18>H>22) CATCH

Objects Observed by This Station

Object Observations Discoveries First Obs Last Obs Magnitude MPECs
PK23H060 11 1 2023-04-20 2023-05-25 23.3 1
PK21L060 10 1 2021-06-08 2021-06-12 24.7 1
PK21K040 3 1 2021-05-17 2021-05-17 22.6 1
0103P 1197 0 2010-03-12 2010-04-09 21.6 133
K10X82Y 744 0 2010-12-22 2010-12-22 22.0 62
0238P 486 0 2021-06-11 2021-11-25 20.9 18
K18E00B 320 0 2018-03-05 2018-03-31 N/A 40
K24Y04R 300 0 2025-02-06 2025-02-22 N/A 60
K10X69P 288 0 2010-12-14 2010-12-14 N/A 8
K17O68P 280 0 2017-07-27 2017-07-27 N/A 35
K15N13K 248 0 2023-02-12 2023-02-15 23.8 62
K14J25O 231 0 2016-08-31 2016-08-31 19.1 77
K14J57H 224 0 2014-05-17 2014-05-17 N/A 56
K15KF7L 216 0 2015-05-24 2015-05-30 N/A 27
K14HC4Q 184 0 2014-04-28 2014-04-28 19.4 46
K14SX9R 168 0 2014-10-05 2014-10-05 N/A 56
0313P 132 0 2019-08-04 2019-08-30 20.5 22
0039P 126 0 2019-07-03 2019-07-05 21.1 9
PK19A030 120 0 2021-03-07 2022-04-01 23.0 5
K15FY4T 104 0 2015-04-09 2015-04-09 20.9 26
K14T64J 96 0 2014-10-10 2014-10-18 N/A 12
K25S79C 90 0 2025-10-03 2025-10-07 N/A 1
K16GO1B 80 0 2016-04-17 2016-04-17 N/A 20
K10F81J 72 0 2010-09-19 2010-09-19 N/A 9
K14B60G 72 0 2014-02-03 2014-02-03 N/A 18
CK16B010 68 0 2016-01-22 2016-01-22 19.4 17
K16O02Y 68 0 2016-08-02 2016-08-02 21.9 17
K19R00C 60 0 2022-10-16 2022-10-16 N/A 20
K25R01M 56 0 2025-09-19 2025-09-19 24.0 8
K21P27H 54 0 2024-07-11 2024-07-11 19.6 18
K15O22A 52 0 2015-07-22 2015-07-22 N/A 13
K16D00L 52 0 2016-02-22 2016-02-22 N/A 13
K16Y08F 48 0 2016-12-27 2016-12-27 N/A 12
K18L02K 42 0 2018-06-08 2018-06-08 N/A 14
0457P 39 0 2023-03-15 2024-03-09 23.1 3
K21L06D 33 0 2021-07-07 2021-07-07 22.3 11
K17M09D 32 0 2017-06-30 2017-07-21 N/A 4
0259P 28 0 2017-04-26 2017-04-29 20.2 2
K17K31O 24 0 2017-05-31 2017-05-31 21.4 6
K25G01N 24 0 2025-04-16 2025-04-16 21.6 3
CK18E04N 16 0 2018-03-16 2018-03-16 19.0 4
K14E45N 16 0 2014-03-13 2014-03-13 N/A 4
K16J38U 15 0 2016-05-28 2016-05-28 N/A 3
PK17O030 10 0 2017-07-01 2017-08-16 23.5 1
K14UL0H 8 0 2014-11-12 2014-11-12 N/A 2
K17G06J 8 0 2017-04-07 2017-04-07 N/A 2
K09M10E 6 0 2009-07-17 2009-07-17 22.0 2
K09M10F 6 0 2009-07-17 2009-08-24 N/A 2
K09M10G 6 0 2009-07-17 2009-07-17 N/A 2
K14B63E 4 0 2014-02-06 2014-02-06 N/A 2
K14F69C 4 0 2014-07-18 2015-01-21 N/A 1
K14F72E 4 0 2014-07-19 2015-01-21 N/A 1
K14F72J 4 0 2014-07-18 2015-01-21 N/A 1
K16S36A 4 0 2016-10-01 2016-10-01 20.8 1
K14F70L 3 0 2014-06-23 2015-01-18 N/A 1
K13U15H 2 0 2013-12-22 2013-12-23 24.6 1
K13U15J 2 0 2013-12-23 2013-12-30 N/A 1
K13U15K 2 0 2013-12-23 2013-12-24 N/A 1
K15Fe3W 2 0 2015-06-15 2015-06-15 N/A 1
K15G50P 2 0 2015-06-15 2015-06-17 N/A 1
PK21K05b 2 0 2022-07-07 2022-07-07 23.8 1
K14F72L 1 0 2014-07-19 2014-07-19 N/A 1
K14F72M 1 0 2014-07-19 2014-07-19 N/A 1
K14Od2T 1 0 2014-08-01 2014-08-01 21.4 1

List of Observers

Observer Group Total MPECs
Unknown 23
C.Trujillo, S.S.Sheppard 10
C.Schambeau, L.Woodney, M.De Pra, S.Ieva, Y.Fernandez 2
A.Cardwell, D.Krogsrud, J.Masiero, M.Schirmer 1
A.Udalski, C.Trujillo, M.Szymanski, S.S.Sheppard 1
C.Schambeau 1
A.Udalski, C.Trujillo, I.Soszynski, S.S.Sheppard 1
H.H.Heish, J.Chavez 1
A.Cikota, D.May, H.H.Hsieh, J.Chavez, P.Prado 1
H.H.Hsieh, J.Chavez 1
H.H.Hsieh, J.Chavez, K.Silva, L.Magill 1
H.H.Hsieh, K.Silva, R.Carrasco, R.Ruiz 1
H.H.Hsieh, L.Magill 1
H.H.Hsieh, L.Magill, S.Margheim 1
A.Garcia, H.H.Hsieh, K.Silva, L.Magill, V.Firpo 1
A.Garcia, H.H.Hsieh, Y.Kang 1
A.Cardwell, E.Wenderoth, J.Masiero 1
A.Lopez, A.Shugart, J.Masiero, L.Magill, M.Gomez 1
A.Shugart, J.Fuentes, J.Masiero, P.Candia 1
D.Krogsrud, J.Masiero 1
D.Sanmartim, E.Marin, J.Masiero 1
G.Gimeno, J.Masiero 1
J.Chavez, J.Fuentes, J.Masiero 1
J.Chavez, J.Masiero, M.Gomez 1
J.Chavez, J.Masiero, P.Prado 1
E.Marin, J.Masiero, L.Magill 1
J.Masiero, M.Andersen, M.Gomez 1
E.Wenderoth, J.Fuentes, J.Madrid, J.Masiero, M.Schirmer, P.Prado 1
J.Masiero, P.Hibon 1
J.Masiero, L.Magill, P.Prado 1
J.Masiero, S.Margheim 1
J.Fuentes, J.Masiero, S.Walsh 1
J.Masiero, P.Prado, V.Firpo 1
K.Silva, P.Prado, R.Angeloni, R.Ruiz 1
J.E.Heo, K.W.Wierzchos, L.Magill 1
L.Barrera, P.Nowajewski 1
A.Shugart, M.Gomez 1
S.S.Sheppard 1
A.Udalski, C.Trujillo, K.Ulaczyk, S.S.Sheppard 1
C.Trujillo, D.J.Tholen, S.S.Sheppard 1
Individual Observer Total MPECs
Unknown 23
J.Masiero 18
S.S.Sheppard 15
C.Trujillo 14
H.H.Hsieh 8
L.Magill 8
J.Chavez 7
P.Prado 6
K.Silva 4
M.Gomez 4
J.Fuentes 4
A.Udalski 3
C.Schambeau 3
A.Shugart 3
A.Cardwell 2
D.Krogsrud 2
M.Schirmer 2
L.Woodney 2
M.De Pra 2
S.Ieva 2
Y.Fernandez 2
R.Ruiz 2
S.Margheim 2
A.Garcia 2
V.Firpo 2
E.Wenderoth 2
E.Marin 2
M.Szymanski 1
I.Soszynski 1
H.H.Heish 1
A.Cikota 1
D.May 1
R.Carrasco 1
Y.Kang 1
A.Lopez 1
P.Candia 1
D.Sanmartim 1
G.Gimeno 1
M.Andersen 1
J.Madrid 1
P.Hibon 1
S.Walsh 1
R.Angeloni 1
J.E.Heo 1
K.W.Wierzchos 1
L.Barrera 1
P.Nowajewski 1
K.Ulaczyk 1
D.J.Tholen 1

List of Measurers

Measurer Group Total MPECs
Unknown 38
J.Masiero 17
M.Micheli 10
H.H.Hsieh, M.Micheli 3
A.D.Grauer, A.R.Gibbs, A.Serrano, D.C.Fuls, D.Fay, D.Rankin, E.J.Christensen, F.C.Shelly, G.J.Leonard, H.Groeller, J.B.Fazekas, J.K.Hogan, K.W.Wierzchos, R.A.Kowalski, R.L.Seaman, S.M.Larson 2
C.Snodgrass 1
J.Masiero, M.Schirmer 1
Individual Measurer Total MPECs
Unknown 38
J.Masiero 18
M.Micheli 13
H.H.Hsieh 3
A.D.Grauer 2
A.R.Gibbs 2
A.Serrano 2
D.C.Fuls 2
D.Fay 2
D.Rankin 2
E.J.Christensen 2
F.C.Shelly 2
G.J.Leonard 2
H.Groeller 2
J.B.Fazekas 2
J.K.Hogan 2
K.W.Wierzchos 2
R.A.Kowalski 2
R.L.Seaman 2
S.M.Larson 2
C.Snodgrass 1
M.Schirmer 1

List of Facilities

Facilities Count
4.1-m reflector + CCD, 1
8.0-m reflector 17
8.1-m Gemini South + CCD 5
8.1-m Gemini-South telescope + CCD 1
8.1-m f/16.0 reflector + 3x2Kx4K mosaic CCD 1
8.1-m reflector + 3x2Kx4K mosaic CCD 1
8.1-m reflector + CCD 8
8.10-m Gemini North reflector + CCD 1
Unknown 37