PRIME Observation Log 2026/02/18

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Raw Log (Time is in SA time)
Ramp Log (Time is in UT)
CCMain Error Log (Time is in SA time)
Observation Log (Time is in UT)

Date: 2026/02/18
Local observer:
Remote observer: Ryusei, Takuto
Weather:
Comment:
Detector Temperature: 111.99996 +- 0.00227 K
ImageAcquisitionErrors occurred 1 times @
2026-02-18 22:26:33 SAT

Expected Time
Twilight Flat Time
(Sun altitude = -5.5°)
Evening 19:47:06
Morning 05:54:28
Science Observation
(Sun altitude < -10°)
Start 20:09:37
End 05:31:57
Bulge Observation
(Sun alt. < -10° & GB alt. > 22°)
Start 02:42:14
End 05:31:57


Observed Fraction
Actually Observed Time
(hh:mm:ss) 		Expected Observation Time
(hh:mm:ss) 		Observed Fraction
(observed/expected)
Total Time 09:37:43 09:22:20 1.027
GB Time 02:51:47 02:49:43 1.012
Non-GB Time 06:45:55 06:32:36 1.034


Institute Statistics
- ALLSKY time is equally distributed to each institute
Institute Total Frame Total Exposure
(hh:mm:ss) 		Total Observation
(hh:mm:ss) 		Efficiency
(exp./obs.)
CALIB 332 00:15:49 00:43:09 0.367
GB 1428 01:08:04 02:51:47 0.396
SAAO 918 00:43:45 01:41:28 0.431
OU 918 00:43:45 01:41:28 0.431
NASA 918 00:43:45 01:41:28 0.431
ABC 918 00:43:45 01:41:28 0.431


Type Statistics
Type Total Frame Total Exposure
(hh:mm:ss) 		Total Observation
(hh:mm:ss) 		Efficiency
(exp./obs.)
TWILIGHT 332 00:15:49 00:43:09 0.367
all_sky_grid 3672 02:55:01 06:45:55 0.431
Bulge 1332 01:03:29 02:28:38 0.427
SKY 96 00:04:34 00:23:09 0.198


Target Statistics
Target Total Frame Total Exposure
(hh:mm:ss) 		Total Observation
(hh:mm:ss) 		Efficiency
(exp./obs.)
test DY 8 00:00:22 00:03:00 0.127
FLAT OY 320 00:15:15 00:34:32 0.442
field9976_test 12 00:00:34 00:05:00 0.114
field9976 60 00:02:51 00:06:45 0.423
field9977 60 00:02:51 00:06:17 0.455
field9978 60 00:02:51 00:06:26 0.444
field9979 60 00:02:51 00:06:19 0.453
field9980 60 00:02:51 00:06:22 0.448
field9981 60 00:02:51 00:06:22 0.448
field9982 60 00:02:51 00:05:43 0.499
field9983 60 00:02:51 00:06:08 0.465
field9984 60 00:02:51 00:05:54 0.484
field9985 60 00:02:51 00:06:25 0.445
field9684 60 00:02:51 00:06:26 0.444
field9685 60 00:02:51 00:06:38 0.430
field9686 60 00:02:51 00:06:06 0.468
field9687 60 00:02:51 00:06:28 0.442
field9688 60 00:02:51 00:06:22 0.449
field9689 60 00:02:51 00:06:43 0.425
field9690 60 00:02:51 00:06:44 0.424
field9691 60 00:02:51 00:06:03 0.472
field9692 60 00:02:51 00:06:45 0.423
field9693 60 00:02:51 00:06:42 0.426
field10864 60 00:02:51 00:05:46 0.495
field10865 60 00:02:51 00:13:43 0.208
field10866 60 00:02:51 00:06:20 0.451
field10867 60 00:02:51 00:06:07 0.467
field10868 60 00:02:51 00:06:16 0.456
field10869 60 00:02:51 00:06:42 0.426
field10870 60 00:02:51 00:06:20 0.451
field10871 60 00:02:51 00:06:20 0.451
field10872 60 00:02:51 00:06:03 0.472
field10873 60 00:02:51 00:06:11 0.462
field11164 60 00:02:51 00:05:40 0.503
field11165 60 00:02:51 00:06:03 0.472
field11166 60 00:02:51 00:06:03 0.472
field11167 60 00:02:51 00:06:22 0.448
field11168 60 00:02:51 00:06:36 0.432
field11169 60 00:02:51 00:05:44 0.498
field11170 60 00:02:51 00:06:03 0.472
field11171 60 00:02:51 00:06:30 0.440
field11172 60 00:02:51 00:06:20 0.451
field11173 60 00:02:51 00:09:11 0.311
field8823 60 00:02:51 00:06:50 0.418
field8824 60 00:02:51 00:06:03 0.472
field8825 60 00:02:51 00:06:17 0.455
field8826 60 00:02:51 00:06:50 0.418
field8827 60 00:02:51 00:06:04 0.471
field8828 60 00:02:51 00:05:56 0.481
field8829 60 00:02:51 00:05:43 0.499
field8830 60 00:02:51 00:05:43 0.499
field8831 60 00:02:51 00:05:40 0.503
field8832 60 00:02:51 00:09:05 0.315
field8542 60 00:02:51 00:06:03 0.472
field8543 60 00:02:51 00:06:20 0.451
field8544 60 00:02:51 00:06:01 0.475
field8545 60 00:02:51 00:06:19 0.453
field8546 60 00:02:51 00:06:17 0.455
field8547 60 00:02:51 00:06:34 0.435
field8548 60 00:02:51 00:05:57 0.480
field8549 60 00:02:51 00:05:43 0.499
field8550 60 00:02:51 00:06:14 0.458
field8551 60 00:02:51 00:07:04 0.404
field8273 60 00:02:51 00:11:42 0.244
GB83_test OJ 8 00:00:22 00:03:53 0.098
GB83_dither OJ 48 00:02:17 00:05:06 0.448
GB100_dither OJ 48 00:02:17 00:05:06 0.448
GB82_dither OJ 48 00:02:17 00:05:11 0.440
GB99_dither OJ 48 00:02:17 00:05:42 0.400
GB117_dither OJ 48 00:02:17 00:04:52 0.470
GB116_dither OJ 48 00:02:17 00:04:52 0.469
GB115_dither OJ 48 00:02:17 00:05:05 0.449
GB98_dither OJ 48 00:02:17 00:04:46 0.479
GB81_dither OJ 48 00:02:17 00:06:41 0.342
GB83_test OH 4 00:00:11 00:04:57 0.038
GCsky 96 00:04:34 00:23:09 0.198
GB83_dither OH 24 00:01:08 00:02:19 0.493
GB100_dither OH 24 00:01:08 00:02:21 0.484
GB82_dither OH 24 00:01:08 00:02:21 0.484
GB76_dither OH 96 00:04:34 00:09:33 0.479
GB77_dither OH 96 00:04:34 00:10:12 0.448
GB78_dither OH 96 00:04:34 00:10:04 0.454
GB94_dither OH 96 00:04:34 00:10:01 0.456
GB111_dither OH 96 00:04:34 00:09:57 0.460
GB110_dither OH 96 00:04:34 00:09:18 0.492
GB109_dither OH 48 00:02:17 00:05:31 0.414
GB92_dither OH 24 00:01:08 00:02:30 0.456
GB93_dither OH 24 00:01:08 00:02:41 0.425
GB75_dither OH 48 00:02:17 00:05:03 0.452
GB112_dither OH 24 00:01:08 00:02:19 0.493
GB79_dither OH 24 00:01:08 00:02:54 0.393
GB60_dither OH 24 00:01:08 00:02:42 0.423
GB95_dither OH 24 00:01:08 00:02:27 0.465
FLAT_test OY 4 00:00:11 00:05:36 0.034










Stats so far in 2026
Monthly observed fraction so far in 2026
Month Observed Time
(hh:mm:ss) 		Expected Time
(hh:mm:ss) 		Observed Fraction
(observed/expected)
Jan 55:55:01 259:31:55 0.215
Feb 60:00:58 163:25:57 0.367

Observed time so far in 2026
- Total time of each institute is calculated by the following
    [All observation time in 2026] = [Observed time so far] + [Remaining time in the future]
    [Remaining time in the future] = [Clear sky fraction] x [Remaining night time (Sun alt. < -10°)]
    
    [GB observation time in 2026] = [Observed GB time so far] + [Remaining GB time in the future]
    [Remaining GB time in the future] = [Clear sky fraction] x [Remaining GB night time (Sun alt. < -10° & GB alt. > 22°)]
    
    [Non-GB observation time in 2026] = [All observation time in 2026] - [GB observation time in 2026]
    
    [OU, NASA, ABC time in 2026] = 0.24 x [Non-GB observation time in 2026]
    [SAAO time in 2026] = 0.28 x [Non-GB observation time in 2026]
    
- ALLSKY time is equally distributed to each institute
- ToO time is distributed to each institute based on input of observer of each date
- Clear sky fraction of (0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 0.5) is assumed for (Jan, ..., Dec) in the calculation of the remaining observation time
All
(hh:mm:ss) 		GB
(hh:mm:ss) 		Non-GB
(hh:mm:ss) 		SAAO
(hh:mm:ss) 		OU
(hh:mm:ss) 		NASA
(hh:mm:ss) 		ABC
(hh:mm:ss) 		CALIB
(hh:mm:ss)
Total 1793:21:08 935:39:13 857:41:55 240:09:20 205:50:51 205:50:51 205:50:51 19:05:38
Observed 115:56:03
(6.46%)		 14:58:26
(1.60%)		 100:57:37
(11.77%)		 27:54:34
(11.62%)		 23:20:45
(11.34%)		 28:53:04
(14.03%)		 20:49:12
(10.11%)		 19:05:38
(N/A)
Remaining 1677:25:05
(93.54%)		 920:40:47
(98.40%)		 756:44:17
(88.23%)		 212:14:45
(88.38%)		 182:30:06
(88.66%)		 176:57:47
(85.97%)		 185:01:38
(89.89%)		 00:00:00
(N/A)











Camera status (2026/02/18)



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