PRIME Observation Log 2026/03/31

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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: 2026/03/31
Local observer:
Remote observer: Takuto, Shuma, Hideaki, Kansuke
Weather: clear
Comment:
Detector Temperature: 114.54770 +- 0.06282 K
ImageAcquisitionErrors occurred 3 times @
2026-03-31 22:48:30 SAT
2026-03-31 22:49:56 SAT
2026-03-31 23:13:32 SAT

Expected Time
Twilight Flat Time
(Sun altitude = -5.5°)
Evening 18:55:51
Morning 06:26:06
Science Observation
(Sun altitude < -10°)
Start 19:17:09
End 06:04:47
Bulge Observation
(Sun alt. < -10° & GB alt. > 22°)
Start 00:01:03
End 06:04:47


Observed Fraction
Actually Observed Time
(hh:mm:ss) 		Expected Observation Time
(hh:mm:ss) 		Observed Fraction
(observed/expected)
Total Time 07:44:15 10:47:37 0.717
GB Time 06:02:11 06:03:43 0.996
Non-GB Time 01:42:03 04:43:54 0.360


Institute Statistics
Institute Total Frame Total Exposure
(hh:mm:ss) 		Total Observation
(hh:mm:ss) 		Efficiency
(exp./obs.)
CALIB 404 00:19:15 00:49:45 0.387
SAAO 885 00:42:11 01:42:03 0.413
GB 3452 02:44:32 06:02:11 0.454


Type Statistics
Type Total Frame Total Exposure
(hh:mm:ss) 		Total Observation
(hh:mm:ss) 		Efficiency
(exp./obs.)
TWILIGHT 404 00:19:15 00:49:45 0.387
ToO 52 00:02:28 00:32:15 0.077
all_sky_grid 833 00:39:42 01:09:48 0.569
Bulge 3356 02:39:58 05:52:09 0.454
SKY 96 00:04:34 00:10:01 0.456


Target Statistics
Target Total Frame Total Exposure
(hh:mm:ss) 		Total Observation
(hh:mm:ss) 		Efficiency
(exp./obs.)
test DY 4 00:00:11 00:14:32 0.013
FLAT OY 400 00:19:04 00:35:13 0.541
field3448_test 12 00:00:34 00:21:36 0.026
field3448 40 00:01:54 00:10:38 0.179
field4564_test 54 00:02:34 00:12:12 0.211
field4564 779 00:37:07 00:57:36 0.645
GB83_test OH 12 00:00:34 00:06:33 0.087
GB96_test OH 4 00:00:11 00:01:55 0.099
GB83_dither OH 24 00:01:08 00:02:19 0.493
GB100_dither OH 24 00:01:08 00:02:16 0.503
GB117_dither OH 24 00:01:08 00:02:16 0.503
GB116_dither OH 24 00:01:08 00:02:19 0.493
GB99_dither OH 24 00:01:08 00:02:16 0.503
GB82_dither OH 24 00:01:08 00:02:21 0.484
GB81_dither OH 24 00:01:08 00:02:21 0.484
GB98_dither OH 24 00:01:08 00:02:19 0.493
GB115_dither OH 24 00:01:08 00:02:19 0.493
GB114_dither OH 48 00:02:17 00:08:53 0.257
GB97_dither OH 76 00:03:37 00:08:58 0.404
GB80_dither OH 72 00:03:25 00:07:17 0.471
GB63_dither OH 24 00:01:08 00:02:19 0.493
GB62_dither OH 24 00:01:08 00:02:19 0.493
GB61_dither OH 24 00:01:08 00:02:21 0.484
GB59_dither OH 24 00:01:08 00:02:19 0.493
GB58_dither OH 24 00:01:08 00:02:19 0.493
GB57_dither OH 24 00:01:08 00:02:30 0.456
GCsky 96 00:04:34 00:10:01 0.456
GB74_dither OH 72 00:03:25 00:08:38 0.397
GB76_dither OH 240 00:11:26 00:23:17 0.491
GB77_dither OH 240 00:11:26 00:23:34 0.485
GB78_dither OH 240 00:11:26 00:24:46 0.462
GB94_dither OH 216 00:10:17 00:21:06 0.488
GB111_dither OH 216 00:10:17 00:21:06 0.488
GB110_dither OH 216 00:10:17 00:21:00 0.490
GB109_dither OH 144 00:06:51 00:14:14 0.482
GB92_dither OH 72 00:03:25 00:07:05 0.484
GB93_dither OH 72 00:03:25 00:07:03 0.487
GB75_dither OH 144 00:06:51 00:14:11 0.483
GB112_dither OH 120 00:05:43 00:11:47 0.485
GB79_dither OH 144 00:06:51 00:17:53 0.384
GB60_dither OH 96 00:04:34 00:09:33 0.479
GB108_dither OH 72 00:03:25 00:08:04 0.425
GB91_dither OH 72 00:03:25 00:07:50 0.437
GB95_dither OH 96 00:04:34 00:10:40 0.429
GB113_dither OH 72 00:03:25 00:07:05 0.484
GB96_dither OH 72 00:03:25 00:07:17 0.471
GB131_dither OH 24 00:01:08 00:02:27 0.465
GB130_dither OH 24 00:01:08 00:02:24 0.474
GB129_dither OH 24 00:01:08 00:02:24 0.474
GB128_dither OH 24 00:01:08 00:02:21 0.484
GB127_dither OH 24 00:01:08 00:02:24 0.474
GB126_dither OH 24 00:01:08 00:02:21 0.484
GB125_dither OH 24 00:01:08 00:02:49 0.404










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

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 1748:40:35 936:06:49 812:33:45 227:31:03 195:00:54 195:00:54 195:00:54 28:37:08
Observed 278:31:37
(15.93%)		 107:43:21
(11.51%)		 170:48:16
(21.02%)		 72:48:31
(32.00%)		 31:22:33
(16.09%)		 37:46:11
(19.37%)		 28:51:00
(14.79%)		 28:37:08
(N/A)
Remaining 1470:08:57
(84.07%)		 828:23:28
(88.49%)		 641:45:28
(78.98%)		 154:42:31
(68.00%)		 163:38:20
(83.91%)		 157:14:42
(80.63%)		 166:09:53
(85.21%)		 00:00:00
(N/A)











Camera status (2026/03/31)



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