Revolution: 0456

POS_0456_LTC003_600_00_0002.XMM



S Date & Time Event OM EMOS1 EMOS2 EPN RGS1 RGS2
2002-06-05 | 03:48:20 PSF_START PSF version: 0456_02 Covers: 47h 52m 4s
P 2002-06-05 | 06:37:24 PERIGEE_EXIT RA: 21:40:36.00 DEC: +71:19:48.0 PA: 066:04:16.6
P 2002-06-05 | 06:37:24 ACTIVE_OPEN Dur: 1h 20m 0s
P 2002-06-05 | 06:37:24 SLEW_START RA: 12:29:46.00 DEC: +07:59:47.0 PA: 295:18:25.3
P 2002-06-05 | 06:37:24 ID: 9045600001 Slew: 4289 secs Ac/Rt: 0450.0/090.000 Sci/CLoop: Y/N
P 2002-06-05 | 07:09:00 40000 km
P 2002-06-05 | 07:48:53 SLEW_END
P 2002-06-05 | 07:57:14 RadMon SLOW
P 2002-06-05 | 07:57:24 ACTIVE_CLOSE
P 2002-06-05 | 07:57:24 INSTRUMENT_OPEN Dur: 39h 42m 12s
P 2002-06-05 | 09:31:00 Handover_Start
K 2002-06-05 | 10:01:00 Handover_Stop
K 2002-06-05 | 10:01:01 OBS_START RA: 12:29:46.00 DEC: +07:59:47.0 Prime: E3
K 2002-06-05 | 10:01:01 ID: 0112552201 ngc4472 Obs_dur: 25961 secs
K 2002-06-05 | 10:01:14   THIN1
K 2002-06-05 | 10:17:31   THIN1 THIN1
K 2002-06-05 | 10:17:38   Spectro + Q
004: 24672 sec
Spectro + Q
005: 24672 sec
K 2002-06-05 | 10:18:31   OM START
400: 303 sec
K 2002-06-05 | 10:18:42   Full Frame
001: 24209 sec
Full Frame
002: 24209 sec
K 2002-06-05 | 10:19:17  
K 2002-06-05 | 10:19:17   V
K 2002-06-05 | 10:19:17   ... exp continues
K 2002-06-05 | 10:23:34  
K 2002-06-05 | 10:24:05   U - No Bar
K 2002-06-05 | 10:24:38   Image
006: 1206 sec
K 2002-06-05 | 10:44:44  
K 2002-06-05 | 10:44:46   Image
401: 1270 sec
K 2002-06-05 | 10:45:19  
K 2002-06-05 | 10:45:19   U - No Bar
K 2002-06-05 | 10:45:19   ... exp continues
K 2002-06-05 | 11:05:56  
K 2002-06-05 | 11:05:58   Image
402: 1270 sec
K 2002-06-05 | 11:06:31  
K 2002-06-05 | 11:06:31   U - No Bar
K 2002-06-05 | 11:06:31   ... exp continues
K 2002-06-05 | 11:10:28   Ext Full Fra
003: 20468 sec
K 2002-06-05 | 11:27:08  
K 2002-06-05 | 11:27:10   Image
403: 1270 sec
K 2002-06-05 | 11:27:43  
K 2002-06-05 | 11:27:43   U - No Bar
K 2002-06-05 | 11:27:43   ... exp continues
K 2002-06-05 | 11:48:20  
K 2002-06-05 | 11:48:22   Image
404: 1270 sec
K 2002-06-05 | 11:48:55  
K 2002-06-05 | 11:48:55   U - No Bar
K 2002-06-05 | 11:48:55   ... exp continues
K 2002-06-05 | 12:09:32  
K 2002-06-05 | 12:10:03   UVW1
K 2002-06-05 | 12:10:36   Image
007: 2256 sec
K 2002-06-05 | 12:48:12  
K 2002-06-05 | 12:48:14   Image
405: 2320 sec
K 2002-06-05 | 12:48:47  
K 2002-06-05 | 12:48:47   UVW1
K 2002-06-05 | 12:48:47   ... exp continues
K 2002-06-05 | 13:26:54  
K 2002-06-05 | 13:26:56   Image
406: 2320 sec
K 2002-06-05 | 13:27:29  
K 2002-06-05 | 13:27:29   UVW1
K 2002-06-05 | 13:27:29   ... exp continues
K 2002-06-05 | 14:05:36  
K 2002-06-05 | 14:05:38   Image
407: 2320 sec
K 2002-06-05 | 14:06:11  
K 2002-06-05 | 14:06:11   UVW1
K 2002-06-05 | 14:06:11   ... exp continues
K 2002-06-05 | 14:44:18  
K 2002-06-05 | 14:44:20   Image
408: 2320 sec
K 2002-06-05 | 14:44:53  
K 2002-06-05 | 14:44:53   UVW1
K 2002-06-05 | 14:44:53   ... exp continues
K 2002-06-05 | 15:23:00  
K 2002-06-05 | 15:23:31   UVM2
K 2002-06-05 | 15:24:04   Image
008: 1256 sec
K 2002-06-05 | 15:45:00  
K 2002-06-05 | 15:45:02   Image
409: 1320 sec
K 2002-06-05 | 15:45:35  
K 2002-06-05 | 15:45:35   UVM2
K 2002-06-05 | 15:45:35   ... exp continues
K 2002-06-05 | 16:07:02  
K 2002-06-05 | 16:07:04   Image
410: 1320 sec
K 2002-06-05 | 16:07:37  
K 2002-06-05 | 16:07:37   UVM2
K 2002-06-05 | 16:07:37   ... exp continues
K 2002-06-05 | 16:29:04  
K 2002-06-05 | 16:29:06   Image
411: 1320 sec
K 2002-06-05 | 16:29:39  
K 2002-06-05 | 16:29:39   UVM2
K 2002-06-05 | 16:29:39   ... exp continues
K 2002-06-05 | 16:51:06  
K 2002-06-05 | 16:51:08   Image
412: 1320 sec
K 2002-06-05 | 16:51:36  
K 2002-06-05 | 16:51:36   CLOSED
K 2002-06-05 | 16:51:41  
K 2002-06-05 | 16:51:41   UVM2
K 2002-06-05 | 16:51:41   ... exp continues
K 2002-06-05 | 17:02:11  
K 2002-06-05 | 17:02:11   CLOSED CLOSED
K 2002-06-05 | 17:08:50  
K 2002-06-05 | 17:13:08  
K 2002-06-05 | 17:13:08   Blocked
K 2002-06-05 | 17:13:42 OBS_END
K 2002-06-05 | 17:13:42 SLEW_START RA: 13:01:50.20 DEC: +28:09:28.0 PA: 309:00:00.0
K 2002-06-05 | 17:13:42 ID: 9045600002 Slew: 1419 secs Ac/Rt: 0450.0/090.000 Sci/CLoop: Y/N
K 2002-06-05 | 17:37:21 SLEW_END
K 2002-06-05 | 17:54:51 OBS_START RA: 13:01:50.20 DEC: +28:09:28.0 Prime: E3
K 2002-06-05 | 17:54:51 ID: 0124712601 Coma12 Obs_dur: 31003 secs
K 2002-06-05 | 17:55:04   MEDIUM
K 2002-06-05 | 18:11:21   MEDIUM MEDIUM
K 2002-06-05 | 18:11:28   Spectro + Q
004: 29672 sec
Spectro + Q
005: 29672 sec
K 2002-06-05 | 18:12:21   OM START
400: 303 sec
K 2002-06-05 | 18:12:32   Full Frame
002: 29209 sec
Full Frame
003: 29209 sec
K 2002-06-05 | 18:13:07  
K 2002-06-05 | 18:13:07   V
K 2002-06-05 | 18:13:07   ... exp continues
K 2002-06-05 | 18:17:24  
K 2002-06-05 | 18:17:55   UVW1
K 2002-06-05 | 18:18:28   Image
007: 1696 sec
K 2002-06-05 | 18:46:44  
K 2002-06-05 | 18:46:46   Image
401: 1760 sec
K 2002-06-05 | 18:47:19  
K 2002-06-05 | 18:47:19   UVW1
K 2002-06-05 | 18:47:19   ... exp continues
K 2002-06-05 | 19:04:18   Ext Full Fra
001: 25468 sec
K 2002-06-05 | 19:16:06  
K 2002-06-05 | 19:16:08   Image
402: 1760 sec
K 2002-06-05 | 19:16:41  
K 2002-06-05 | 19:16:41   UVW1
K 2002-06-05 | 19:16:41   ... exp continues
K 2002-06-05 | 19:45:28  
K 2002-06-05 | 19:45:30   Image
403: 1760 sec
K 2002-06-05 | 19:46:03  
K 2002-06-05 | 19:46:03   UVW1
K 2002-06-05 | 19:46:03   ... exp continues
K 2002-06-05 | 20:14:50  
K 2002-06-05 | 20:14:52   Image
404: 1760 sec
K 2002-06-05 | 20:15:25  
K 2002-06-05 | 20:15:25   UVW1
K 2002-06-05 | 20:15:25   ... exp continues
K 2002-06-05 | 20:44:12  
K 2002-06-05 | 20:44:43   UVW2
K 2002-06-05 | 20:45:16   Image
008: 5176 sec
K 2002-06-05 | 21:22:29 Handover_Start
S 2002-06-05 | 21:52:29 Handover_Stop
S 2002-06-05 | 22:11:32  
S 2002-06-05 | 22:11:34   Image
405: 5240 sec
S 2002-06-05 | 22:12:07  
S 2002-06-05 | 22:12:07   UVW2
S 2002-06-05 | 22:12:07   ... exp continues
S 2002-06-05 | 22:48:05 Handover_Start
P 2002-06-05 | 23:18:05 Handover_Stop
P 2002-06-05 | 23:38:54  
P 2002-06-05 | 23:38:56   Image
406: 3440 sec
P 2002-06-05 | 23:39:29  
P 2002-06-05 | 23:39:29   UVW2
P 2002-06-05 | 23:39:29   ... exp continues
P 2002-06-06 | 00:36:16  
P 2002-06-06 | 00:36:18   Image
407: 3440 sec
P 2002-06-06 | 00:36:51  
P 2002-06-06 | 00:36:51   UVW2
P 2002-06-06 | 00:36:51   ... exp continues
P 2002-06-06 | 01:33:38  
P 2002-06-06 | 01:33:40   Image
408: 3440 sec
P 2002-06-06 | 01:34:13  
P 2002-06-06 | 01:34:13   UVW2
P 2002-06-06 | 01:34:13   ... exp continues
P 2002-06-06 | 02:08:46  
P 2002-06-06 | 02:08:46   CLOSED
P 2002-06-06 | 02:19:21  
P 2002-06-06 | 02:19:21   CLOSED CLOSED
P 2002-06-06 | 02:26:00  
P 2002-06-06 | 02:31:00  
P 2002-06-06 | 02:31:00   Blocked
P 2002-06-06 | 02:31:34 OBS_END
P 2002-06-06 | 02:31:34 SLEW_START RA: 09:27:46.78 DEC: -06:04:16.3 PA: 294:22:44.4
P 2002-06-06 | 02:31:34 ID: 9045600003 Slew: 2928 secs Ac/Rt: 0450.0/090.000 Sci/CLoop: Y/N
P 2002-06-06 | 03:20:22 SLEW_END
P 2002-06-06 | 03:37:52 OBS_START RA: 09:27:46.78 DEC: -06:04:16.3 Prime: E3
P 2002-06-06 | 03:37:52 ID: 0032342301 HD 81809 Obs_dur: 7462 secs
P 2002-06-06 | 03:38:05   MEDIUM
P 2002-06-06 | 03:54:29   Spectro + Q
004: 6448 sec
Spectro + Q
006: 6448 sec
P 2002-06-06 | 03:54:32   MEDIUM MEDIUM
P 2002-06-06 | 03:55:43   Small Window
002: 5985 sec
Small Window
005: 5985 sec
P 2002-06-06 | 03:56:04   Flat Low
003: 4100 sec
P 2002-06-06 | 03:56:04  
P 2002-06-06 | 03:56:04   Blocked
P 2002-06-06 | 03:56:04   ... exp continues
P 2002-06-06 | 04:00:35   Small Window
001: 5053 sec
P 2002-06-06 | 05:04:24  
P 2002-06-06 | 05:04:24   Blocked
P 2002-06-06 | 05:24:48  
P 2002-06-06 | 05:24:48   CLOSED
P 2002-06-06 | 05:35:28  
P 2002-06-06 | 05:35:28   CLOSED CLOSED
P 2002-06-06 | 05:41:57  
P 2002-06-06 | 05:42:14 OBS_END
P 2002-06-06 | 05:42:14 SLEW_START RA: 12:56:02.95 DEC: +25:56:45.0 PA: 302:42:54.0
P 2002-06-06 | 05:42:14 ID: 9045600004 Slew: 2842 secs Ac/Rt: 0450.0/090.000 Sci/CLoop: Y/N
P 2002-06-06 | 06:29:36 SLEW_END
P 2002-06-06 | 06:47:06 OBS_START RA: 12:56:02.95 DEC: +25:56:45.0 Prime: E3
P 2002-06-06 | 06:47:06 ID: 0012850801 C1256.0+2556 Obs_dur: 29231 secs
P 2002-06-06 | 06:47:19   THIN1
P 2002-06-06 | 07:03:36   THIN1 THIN1
P 2002-06-06 | 07:03:43   Spectro + Q
004: 27917 sec
Spectro + Q
005: 27917 sec
P 2002-06-06 | 07:04:36   OM START
400: 303 sec
P 2002-06-06 | 07:04:47   Full Frame
001: 27454 sec
Full Frame
002: 27454 sec
P 2002-06-06 | 07:05:22  
P 2002-06-06 | 07:05:22   V
P 2002-06-06 | 07:05:22   ... exp continues
P 2002-06-06 | 07:09:39  
P 2002-06-06 | 07:10:10   U - No Bar
P 2002-06-06 | 07:10:43   Image
006: 1890 sec
P 2002-06-06 | 07:27:18   Full Frame
003: 25468 sec
P 2002-06-06 | 07:42:13  
P 2002-06-06 | 07:42:15   Image
401: 1954 sec
P 2002-06-06 | 07:42:48  
P 2002-06-06 | 07:42:48   U - No Bar
P 2002-06-06 | 07:42:48   ... exp continues
P 2002-06-06 | 08:14:49  
P 2002-06-06 | 08:14:51   Image
402: 1954 sec
P 2002-06-06 | 08:15:24  
P 2002-06-06 | 08:15:24   U - No Bar
P 2002-06-06 | 08:15:24   ... exp continues
P 2002-06-06 | 08:47:25  
P 2002-06-06 | 08:47:27   Image
403: 1954 sec
P 2002-06-06 | 08:48:00  
P 2002-06-06 | 08:48:00   U - No Bar
P 2002-06-06 | 08:48:00   ... exp continues
P 2002-06-06 | 09:20:01  
P 2002-06-06 | 09:20:03   Image
404: 1954 sec
P 2002-06-06 | 09:20:36  
P 2002-06-06 | 09:20:36   U - No Bar
P 2002-06-06 | 09:20:36   ... exp continues
P 2002-06-06 | 09:52:37  
P 2002-06-06 | 09:53:08   B
P 2002-06-06 | 09:53:41   Image
007: 1056 sec
P 2002-06-06 | 10:11:17  
P 2002-06-06 | 10:11:19   Image
405: 1120 sec
P 2002-06-06 | 10:11:52  
P 2002-06-06 | 10:11:52   B
P 2002-06-06 | 10:11:52   ... exp continues
P 2002-06-06 | 10:29:59  
P 2002-06-06 | 10:30:01   Image
406: 1120 sec
P 2002-06-06 | 10:30:34  
P 2002-06-06 | 10:30:34   B
P 2002-06-06 | 10:30:34   ... exp continues
P 2002-06-06 | 10:48:41  
P 2002-06-06 | 10:48:43   Image
407: 1120 sec
P 2002-06-06 | 10:49:16  
P 2002-06-06 | 10:49:16   B
P 2002-06-06 | 10:49:16   ... exp continues
P 2002-06-06 | 11:07:23  
P 2002-06-06 | 11:07:25   Image
408: 1120 sec
P 2002-06-06 | 11:07:58  
P 2002-06-06 | 11:07:58   B
P 2002-06-06 | 11:07:58   ... exp continues
P 2002-06-06 | 11:26:05  
P 2002-06-06 | 11:26:36   UVW1
P 2002-06-06 | 11:27:09   Image
008: 2066 sec
P 2002-06-06 | 12:01:35  
P 2002-06-06 | 12:01:37   Image
409: 2130 sec
P 2002-06-06 | 12:02:10  
P 2002-06-06 | 12:02:10   UVW1
P 2002-06-06 | 12:02:10   ... exp continues
P 2002-06-06 | 12:37:07  
P 2002-06-06 | 12:37:09   Image
410: 2130 sec
P 2002-06-06 | 12:37:42  
P 2002-06-06 | 12:37:42   UVW1
P 2002-06-06 | 12:37:42   ... exp continues
P 2002-06-06 | 13:12:39  
P 2002-06-06 | 13:12:41   Image
411: 2130 sec
P 2002-06-06 | 13:13:14  
P 2002-06-06 | 13:13:14   UVW1
P 2002-06-06 | 13:13:14   ... exp continues
P 2002-06-06 | 13:16:56 Handover_Start
K 2002-06-06 | 13:46:56 Handover_Stop
K 2002-06-06 | 13:48:11  
K 2002-06-06 | 13:48:13   Image
412: 2130 sec
K 2002-06-06 | 13:48:46  
K 2002-06-06 | 13:48:46   UVW1
K 2002-06-06 | 13:48:46   ... exp continues
K 2002-06-06 | 14:23:43  
K 2002-06-06 | 14:23:43   Blocked
K 2002-06-06 | 14:31:46  
K 2002-06-06 | 14:31:46   CLOSED
K 2002-06-06 | 14:42:21  
K 2002-06-06 | 14:42:21   CLOSED CLOSED
K 2002-06-06 | 14:49:00  
K 2002-06-06 | 14:54:17 OBS_END
K 2002-06-06 | 14:54:17 SLEW_START RA: 12:30:50.00 DEC: +15:43:30.0 PA: 297:24:16.9
K 2002-06-06 | 14:54:17 ID: 9045600005 Slew: 937 secs Ac/Rt: 0450.0/090.000 Sci/CLoop: Y/N
K 2002-06-06 | 15:09:54 SLEW_END
K 2002-06-06 | 15:27:24 OBS_START RA: 12:30:50.00 DEC: +15:43:30.0 Prime: E3
K 2002-06-06 | 15:27:24 ID: 0106061401 Virgo 10 Obs_dur: 15795 secs
K 2002-06-06 | 15:27:37   THIN1
K 2002-06-06 | 15:43:54   THIN1 THIN1
K 2002-06-06 | 15:44:01   Spectro + Q
004: 14417 sec
Spectro + Q
005: 14417 sec
K 2002-06-06 | 15:44:54   OM START
400: 303 sec
K 2002-06-06 | 15:45:05   Full Frame
001: 13954 sec
Full Frame
002: 13954 sec
K 2002-06-06 | 15:45:40  
K 2002-06-06 | 15:45:40   V
K 2002-06-06 | 15:45:40   ... exp continues
K 2002-06-06 | 15:49:57  
K 2002-06-06 | 15:50:28   U - No Bar
K 2002-06-06 | 15:51:01   Image
006: 2816 sec
K 2002-06-06 | 16:07:36   Full Frame
003: 11968 sec
K 2002-06-06 | 16:37:57  
K 2002-06-06 | 16:37:59   Image
401: 2880 sec
K 2002-06-06 | 16:38:32  
K 2002-06-06 | 16:38:32   U - No Bar
K 2002-06-06 | 16:38:32   ... exp continues
K 2002-06-06 | 17:25:59  
K 2002-06-06 | 17:26:01   Image
402: 2880 sec
K 2002-06-06 | 17:26:34  
K 2002-06-06 | 17:26:34   U - No Bar
K 2002-06-06 | 17:26:34   ... exp continues
K 2002-06-06 | 18:14:01  
K 2002-06-06 | 18:14:03   Image
403: 2880 sec
K 2002-06-06 | 18:14:36  
K 2002-06-06 | 18:14:36   U - No Bar
K 2002-06-06 | 18:14:36   ... exp continues
K 2002-06-06 | 19:02:03  
K 2002-06-06 | 19:02:05   Image
404: 2880 sec
K 2002-06-06 | 19:02:38  
K 2002-06-06 | 19:02:38   U - No Bar
K 2002-06-06 | 19:02:38   ... exp continues
K 2002-06-06 | 19:27:04  
K 2002-06-06 | 19:27:04   CLOSED
K 2002-06-06 | 19:37:39  
K 2002-06-06 | 19:37:39   CLOSED CLOSED
K 2002-06-06 | 19:44:18  
K 2002-06-06 | 19:50:05  
K 2002-06-06 | 19:50:05   Blocked
K 2002-06-06 | 19:50:39 OBS_END
K 2002-06-06 | 19:50:39 SLEW_START RA: 12:30:50.00 DEC: +15:03:30.0 PA: 297:15:01.5
K 2002-06-06 | 19:50:39 ID: 9045600006 Slew: 450 secs Ac/Rt: 0225.0/120.000 Sci/CLoop: Y/Y
K 2002-06-06 | 19:58:09 SLEW_END
K 2002-06-06 | 20:15:39 OBS_START RA: 12:30:50.00 DEC: +15:03:30.0 Prime: E3
K 2002-06-06 | 20:15:39 ID: 0106061501 Virgo 8 Obs_dur: 11995 secs
K 2002-06-06 | 20:15:52   THIN1
K 2002-06-06 | 20:32:09   THIN1 THIN1
K 2002-06-06 | 20:32:16   Spectro + Q
004: 9056 sec
Spectro + Q
005: 9056 sec
K 2002-06-06 | 20:33:09   OM START
400: 303 sec
K 2002-06-06 | 20:33:20   Full Frame
001: 9174 sec
Full Frame
002: 9174 sec
K 2002-06-06 | 20:33:55  
K 2002-06-06 | 20:33:55   V
K 2002-06-06 | 20:33:55   ... exp continues
K 2002-06-06 | 20:38:12  
K 2002-06-06 | 20:38:43   U - No Bar
K 2002-06-06 | 20:39:16   Image
006: 2056 sec
K 2002-06-06 | 20:55:51   Full Frame
003: 9468 sec
K 2002-06-06 | 21:13:32  
K 2002-06-06 | 21:13:34   Image
401: 2120 sec
K 2002-06-06 | 21:14:07  
K 2002-06-06 | 21:14:07   U - No Bar
K 2002-06-06 | 21:14:07   ... exp continues
K 2002-06-06 | 21:48:54  
K 2002-06-06 | 21:48:56   Image
402: 2120 sec
K 2002-06-06 | 21:49:29  
K 2002-06-06 | 21:49:29   U - No Bar
K 2002-06-06 | 21:49:29   ... exp continues
K 2002-06-06 | 22:24:16  
K 2002-06-06 | 22:24:18   Image
403: 2120 sec
K 2002-06-06 | 22:24:51  
K 2002-06-06 | 22:24:51   U - No Bar
K 2002-06-06 | 22:24:51   ... exp continues
K 2002-06-06 | 22:59:38  
K 2002-06-06 | 22:59:40   Image
404: 2120 sec
K 2002-06-06 | 23:00:13  
K 2002-06-06 | 23:00:13   U - No Bar
K 2002-06-06 | 23:00:13   ... exp continues
K 2002-06-06 | 23:03:12  
K 2002-06-06 | 23:06:14  
K 2002-06-06 | 23:06:14   CLOSED CLOSED
K 2002-06-06 | 23:33:39  
K 2002-06-06 | 23:33:39   CLOSED
K 2002-06-06 | 23:35:00  
K 2002-06-06 | 23:35:00   Blocked
K 2002-06-06 | 23:35:34 OBS_END
K 2002-06-06 | 23:35:34 SLEW_START RA: 21:40:36.00 DEC: +71:19:48.0 PA: 064:07:57.1
K 2002-06-06 | 23:35:34 ID: 9045600007 Slew: 4010 secs Ac/Rt: 0450.0/090.000 Sci/CLoop: Y/N
K 2002-06-06 | 23:39:36 INSTRUMENT_CLOSE
K 2002-06-06 | 23:39:36 DEACTIVE_OPEN Dur: 2h 40m 48s
K 2002-06-06 | 23:40:06 RadMon FAST
K 2002-06-07 | 00:19:42 40000 km
K 2002-06-07 | 00:42:24 SLEW_END
K 2002-06-07 | 01:58:13 PERIGEE_ENTRY RA: 21:40:36.00 DEC: +71:19:48.0 PA: 064:07:57.1
K 2002-06-07 | 02:20:24 DEACTIVE_CLOSE
K 2002-06-07 | 03:40:24 PSF_STOP