PRIME Observation Log 2026/01/31

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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: 2026/01/31
Local observer:
Remote observer:
Weather:
Comment:
Detector Temperature: 112.00007 +- 0.00113 K
ImageAcquisitionErrors occurred 0 times

Expected Time
Twilight Flat Time
(Sun altitude = -5.5°)
Evening 20:03:43
Morning 05:37:03
Science Observation
(Sun altitude < -10°)
Start 20:27:27
End 05:13:19
Bulge Observation
(Sun alt. < -10° & GB alt. > 22°)
Start 03:53:00
End 05:13:19


Observed Fraction
Actually Observed Time
(hh:mm:ss) 		Expected Observation Time
(hh:mm:ss) 		Observed Fraction
(observed/expected)
Total Time 08:13:10 08:45:52 0.938
GB Time 00:38:55 01:20:19 0.485
Non-GB Time 07:34:14 07:25:32 1.020


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 680 00:32:24 01:03:02 0.514
GB 124 00:05:54 00:38:55 0.152
SAAO 1137 00:54:11 01:53:33 0.477
OU 1137 00:54:11 01:53:33 0.477
NASA 1137 00:54:11 01:53:33 0.477
ABC 1137 00:54:11 01:53:33 0.477


Type Statistics
Type Total Frame Total Exposure
(hh:mm:ss) 		Total Observation
(hh:mm:ss) 		Efficiency
(exp./obs.)
TWILIGHT 680 00:32:24 01:03:02 0.514
all_sky_grid 4548 03:36:47 07:34:14 0.477
Bulge 100 00:04:46 00:36:31 0.131
SKY 24 00:01:08 00:02:24 0.474


Target Statistics
Target Total Frame Total Exposure
(hh:mm:ss) 		Total Observation
(hh:mm:ss) 		Efficiency
(exp./obs.)
test DY 4 00:00:11 00:00:41 0.276
FLAT_test OH 8 00:00:22 00:02:59 0.127
FLAT_test DH 4 00:00:11 00:01:07 0.169
FLAT OH 664 00:31:39 00:58:13 0.544
field9107_test 24 00:01:08 00:07:07 0.160
field9107 60 00:02:51 00:05:40 0.503
field9108 60 00:02:51 00:05:40 0.503
field9109 60 00:02:51 00:05:43 0.499
field9110 60 00:02:51 00:06:28 0.442
field9111 60 00:02:51 00:05:40 0.503
field9112 60 00:02:51 00:05:40 0.503
field9113 60 00:02:51 00:05:40 0.503
field9114 60 00:02:51 00:05:43 0.499
field9115 60 00:02:51 00:05:43 0.499
field9116 60 00:02:51 00:05:43 0.499
field9117 60 00:02:51 00:05:52 0.487
field9395 60 00:02:51 00:05:43 0.499
field9396 60 00:02:51 00:05:43 0.499
field9397 60 00:02:51 00:05:54 0.484
field9398 60 00:02:51 00:05:46 0.495
field9399 60 00:02:51 00:05:43 0.499
field9400 60 00:02:51 00:05:43 0.499
field9401 60 00:02:51 00:05:43 0.499
field9402 60 00:02:51 00:05:40 0.503
field9403 60 00:02:51 00:05:40 0.503
field9404 60 00:02:51 00:08:54 0.321
field3083_test 4 00:00:11 00:02:06 0.090
field3083 60 00:02:51 00:05:43 0.499
field3084 60 00:02:51 00:05:46 0.495
field3085 60 00:02:51 00:05:46 0.495
field3086 60 00:02:51 00:05:43 0.499
field3087 60 00:02:51 00:05:43 0.499
field3088 60 00:02:51 00:05:40 0.503
field3089 60 00:02:51 00:05:43 0.499
field3090 60 00:02:51 00:05:40 0.503
field3091 60 00:02:51 00:05:40 0.503
field3092 60 00:02:51 00:05:40 0.503
field3093 60 00:02:51 00:05:40 0.503
field3094 60 00:02:51 00:05:40 0.503
field3095 60 00:02:51 00:07:04 0.404
field3096 60 00:02:51 00:06:42 0.426
field3272 60 00:02:51 00:05:43 0.499
field3273 60 00:02:51 00:05:46 0.495
field3274 60 00:02:51 00:05:46 0.495
field3275 60 00:02:51 00:05:43 0.499
field3276 60 00:02:51 00:05:43 0.499
field3277 60 00:02:51 00:05:43 0.499
field3278 80 00:03:48 00:09:18 0.410
field3279 60 00:02:51 00:05:46 0.495
field3280 60 00:02:51 00:05:49 0.491
field3281 60 00:02:51 00:05:46 0.495
field3282 60 00:02:51 00:05:43 0.499
field3283 60 00:02:51 00:05:43 0.499
field3284 60 00:02:51 00:05:43 0.499
field3285 60 00:02:51 00:07:02 0.406
field3466 60 00:02:51 00:05:46 0.495
field3467 60 00:02:51 00:05:46 0.495
field3468 60 00:02:51 00:05:43 0.499
field3469 60 00:02:51 00:05:43 0.499
field3470 60 00:02:51 00:05:43 0.499
field3471 60 00:02:51 00:05:43 0.499
field3472 60 00:02:51 00:05:49 0.491
field3473 60 00:02:51 00:05:46 0.495
field3474 60 00:02:51 00:05:43 0.499
field3475 60 00:02:51 00:05:49 0.491
field3476 60 00:02:51 00:05:46 0.495
field3477 60 00:02:51 00:05:46 0.495
field3478 60 00:02:51 00:06:53 0.415
field3665 60 00:02:51 00:05:43 0.499
field3666 60 00:02:51 00:05:40 0.503
field3667 60 00:02:51 00:05:43 0.499
field3668 60 00:02:51 00:05:40 0.503
field3669 60 00:02:51 00:05:43 0.499
field3670 60 00:02:51 00:05:40 0.503
field3671 60 00:02:51 00:05:40 0.503
field3672 60 00:02:51 00:05:43 0.499
field3673 60 00:02:51 00:05:43 0.499
field3674 60 00:02:51 00:05:43 0.499
field3675 60 00:02:51 00:05:46 0.495
field3676 60 00:02:51 00:05:43 0.499
field3677 60 00:02:51 00:08:23 0.341
GB83_test OH 12 00:00:34 00:07:43 0.074
test OH 24 00:01:08 00:16:36 0.069
GB76_test OH 16 00:00:45 00:04:44 0.161
GCsky 24 00:01:08 00:02:24 0.474
GB76_dither OH 24 00:01:08 00:02:19 0.493
GB77_dither OH 24 00:01:08 00:05:07 0.223










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

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 1815:03:05 940:28:48 874:34:17 244:52:48 209:53:49 209:53:49 209:53:49 03:42:52
Observed 55:55:01
(3.08%)		 00:38:55
(0.07%)		 55:16:05
(6.32%)		 11:15:50
(4.60%)		 13:47:22
(6.57%)		 18:57:03
(9.03%)		 11:15:50
(5.37%)		 03:42:52
(N/A)
Remaining 1759:08:04
(96.92%)		 939:49:52
(99.93%)		 819:18:11
(93.68%)		 233:36:58
(95.40%)		 196:06:27
(93.43%)		 190:56:46
(90.97%)		 198:37:59
(94.63%)		 00:00:00
(N/A)











Camera status (2026/01/31)



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