PRIME Observation Log 2026/04/04

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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: 2026/04/04
Local observer:
Remote observer: Ryusei, Kansuke, Hideaki
Weather: clear
Comment:
Detector Temperature: 114.49987 +- 0.00132 K
ImageAcquisitionErrors occurred 0 times

Expected Time
Twilight Flat Time
(Sun altitude = -5.5°)
Evening 18:50:49
Morning 06:28:47
Science Observation
(Sun altitude < -10°)
Start 19:12:07
End 06:07:27
Bulge Observation
(Sun alt. < -10° & GB alt. > 22°)
Start 23:45:20
End 06:07:27


Observed Fraction
Actually Observed Time
(hh:mm:ss) 		Expected Observation Time
(hh:mm:ss) 		Observed Fraction
(observed/expected)
Total Time 07:12:56 10:55:19 0.661
GB Time 06:27:10 06:22:06 1.013
Non-GB Time 00:45:45 04:33:12 0.168


Institute Statistics
Institute Total Frame Total Exposure
(hh:mm:ss) 		Total Observation
(hh:mm:ss) 		Efficiency
(exp./obs.)
CALIB 364 00:17:21 00:48:44 0.356
SAAO 700 00:33:22 00:45:45 0.729
GB 3360 02:40:09 06:27:10 0.414


Type Statistics
Type Total Frame Total Exposure
(hh:mm:ss) 		Total Observation
(hh:mm:ss) 		Efficiency
(exp./obs.)
TWILIGHT 364 00:17:21 00:48:44 0.356
all_sky_grid 700 00:33:22 00:45:45 0.729
Bulge 3240 02:34:26 06:11:58 0.415
SKY 120 00:05:43 00:15:11 0.377


Target Statistics
Target Total Frame Total Exposure
(hh:mm:ss) 		Total Observation
(hh:mm:ss) 		Efficiency
(exp./obs.)
test ZY 4 00:00:11 00:01:58 0.097
FLAT ZO 360 00:17:09 00:46:46 0.367
field20212_test 16 00:00:45 00:07:10 0.106
field20212 684 00:32:36 00:38:35 0.845
GB83_test OH 32 00:01:31 00:11:37 0.131
GB83_test OJ 60 00:02:51 00:21:25 0.133
GB82_dither OJ 48 00:02:17 00:04:35 0.498
GB99_dither OJ 48 00:02:17 00:04:32 0.503
GB116_dither OJ 48 00:02:17 00:04:38 0.493
GB81_dither OJ 48 00:02:17 00:04:35 0.498
GB98_dither OJ 48 00:02:17 00:04:35 0.498
GB115_dither OJ 48 00:02:17 00:04:38 0.493
GB63_dither OJ 48 00:02:17 00:04:32 0.503
GB62_dither OJ 48 00:02:17 00:04:35 0.498
GB61_dither OJ 48 00:02:17 00:04:35 0.498
GB60_dither OJ 48 00:02:17 00:04:38 0.493
GB59_dither OJ 48 00:02:17 00:04:32 0.503
GB58_dither OJ 48 00:02:17 00:04:38 0.493
GB57_dither OJ 48 00:02:17 00:04:41 0.488
GCsky 120 00:05:43 00:15:11 0.377
GB78_test OH 4 00:00:11 00:01:52 0.102
GB76_dither OH 264 00:12:35 00:28:45 0.438
GB77_dither OH 264 00:12:35 00:28:12 0.446
GB78_dither OH 264 00:12:35 00:27:44 0.453
GB94_dither OH 264 00:12:35 00:29:10 0.431
GB111_dither OH 264 00:12:35 00:33:04 0.380
GB110_dither OH 240 00:11:26 00:25:32 0.448
GB109_dither OH 120 00:05:43 00:14:06 0.405
GB108_dither OH 24 00:01:08 00:02:33 0.448
GB91_dither OH 24 00:01:08 00:02:21 0.484
GB74_dither OH 24 00:01:08 00:02:24 0.474
GB92_dither OH 72 00:03:25 00:08:07 0.422
GB93_dither OH 72 00:03:25 00:07:29 0.459
GB75_dither OH 120 00:05:43 00:12:44 0.449
GB112_dither OH 120 00:05:43 00:13:08 0.435
GB79_dither OH 120 00:05:43 00:13:47 0.415
GB60_dither OH 72 00:03:25 00:07:05 0.484
GB95_dither OH 48 00:02:17 00:04:57 0.462
GB113_dither OH 48 00:02:17 00:05:23 0.425
GB114_dither OH 24 00:01:08 00:02:38 0.432
GB97_dither OH 24 00:01:08 00:02:19 0.493
GB96_dither OH 24 00:01:08 00:02:58 0.385
GB80_dither OH 24 00:01:08 00:02:35 0.440










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 99:19:50 259:06:19 0.383
Mar 123:19:15 318:51:53 0.387
Apr 07:12:56 43:29:47 0.166

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 1734:08:37 930:03:33 804:05:03 225:08:37 192:58:48 192:58:48 192:58:48 30:24:02
Observed 285:44:33
(16.48%)		 114:10:31
(12.28%)		 171:34:02
(21.34%)		 73:34:17
(32.68%)		 31:22:33
(16.26%)		 37:46:11
(19.57%)		 28:51:00
(14.95%)		 30:24:02
(N/A)
Remaining 1448:24:03
(83.52%)		 815:53:02
(87.72%)		 632:31:01
(78.66%)		 151:34:19
(67.32%)		 161:36:15
(83.74%)		 155:12:37
(80.43%)		 164:07:48
(85.05%)		 00:00:00
(N/A)











Camera status (2026/04/04)



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