PRIME Observation Log 2025/04/16

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Observation Log (Time is in UT)

Date: 2025/04/16
Local observer: Seiya Nakayama
Remote observer: Kansuke Nunota
Weather: clear
Comment:
Detector Temperature: 114.00005 +- 0.00242 K
ImageAcquisitionErrors occurred 1 times @
2025-04-17 02:40:19 SAT

Expected Time
Twilight Flat Time
(Sun altitude = -5.5°)
Evening 18:36:14
Morning 06:36:56
Science Observation
(Sun altitude < -10°)
Start 18:57:42
End 06:15:25
Bulge Observation
(Sun alt. < -10° & GB alt. > 22°)
Start 22:57:08
End 06:15:25


Observed Fraction
Actually Observed Time
(hh:mm:ss) 		Expected Observation Time
(hh:mm:ss) 		Observed Fraction
(observed/expected)
Total Time 08:46:53 11:17:42 0.777
GB Time 05:03:50 07:18:16 0.693
Non-GB Time 03:43:02 03:59:25 0.932


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.)
GB 2440 01:56:18 05:03:50 0.383
CALIB 504 00:24:01 00:45:54 0.523
ALLSKY 2168 01:43:20 03:43:02 0.463
SAAO 542 00:25:50 00:55:45 0.463
OU 542 00:25:50 00:55:45 0.463
NASA 542 00:25:50 00:55:45 0.463
ABC 542 00:25:50 00:55:45 0.463


Type Statistics
Type Total Frame Total Exposure
(hh:mm:ss) 		Total Observation
(hh:mm:ss) 		Efficiency
(exp./obs.)
Bulge 2392 01:54:01 04:56:57 0.384
TWILIGHT 504 00:24:01 00:45:54 0.523
all_sky_grid 2168 01:43:20 03:43:02 0.463
SKY 48 00:02:17 00:06:52 0.333


Target Statistics
Target Total Frame Total Exposure
(hh:mm:ss) 		Total Observation
(hh:mm:ss) 		Efficiency
(exp./obs.)
GB131_dither OJ 4 00:00:11 00:00:41 0.276
FLAT_test OH 24 00:01:08 00:04:42 0.243
FLAT OH 480 00:22:52 00:41:12 0.555
field12731_test 48 00:02:17 00:06:38 0.344
field12731 40 00:01:54 00:04:01 0.474
field12732 40 00:01:54 00:04:12 0.453
field12733 40 00:01:54 00:04:07 0.463
field12734 40 00:01:54 00:04:17 0.444
field12735 40 00:01:54 00:04:06 0.463
field12736 40 00:01:54 00:04:04 0.469
field12737 40 00:01:54 00:04:04 0.469
field12738 40 00:01:54 00:04:18 0.443
field12739 40 00:01:54 00:04:20 0.438
field12740 40 00:01:54 00:04:06 0.463
field12741 40 00:01:54 00:04:06 0.463
field12742 40 00:01:54 00:03:58 0.480
field12743 40 00:01:54 00:03:55 0.485
field12744 40 00:01:54 00:04:01 0.474
field12745 40 00:01:54 00:04:04 0.469
field12746 40 00:01:54 00:04:12 0.453
field12747 40 00:01:54 00:03:58 0.480
field12748 40 00:01:54 00:04:18 0.443
field12749 40 00:01:54 00:03:55 0.485
field12750 40 00:01:54 00:04:18 0.443
field12751 40 00:01:54 00:04:06 0.463
field12752 40 00:01:54 00:04:06 0.463
field12753 40 00:01:54 00:04:04 0.469
field12754 40 00:01:54 00:04:04 0.469
field12755 40 00:01:54 00:03:55 0.485
field12756 40 00:01:54 00:04:18 0.443
field12757 40 00:01:54 00:04:06 0.463
field12758 40 00:01:54 00:03:50 0.497
field12759 40 00:01:54 00:04:06 0.463
field12760 40 00:01:54 00:03:52 0.491
field12761 40 00:01:54 00:03:55 0.485
field12762 40 00:01:54 00:03:47 0.503
field12763 40 00:01:54 00:03:55 0.485
field12764 40 00:01:54 00:03:59 0.478
field12765 40 00:01:54 00:04:03 0.470
field12766 40 00:01:54 00:03:52 0.491
field12767 40 00:01:54 00:03:50 0.497
field12768 40 00:01:54 00:03:52 0.491
field12769 40 00:01:54 00:04:04 0.469
field12770 40 00:01:54 00:04:23 0.434
field12771 40 00:01:54 00:03:58 0.480
field12772 40 00:01:54 00:04:18 0.443
field12773 40 00:01:54 00:03:50 0.497
field12774 40 00:01:54 00:03:47 0.503
field12775 40 00:01:54 00:03:47 0.503
field12776 40 00:01:54 00:04:04 0.469
field12777 40 00:01:54 00:04:15 0.448
field12778 40 00:01:54 00:03:58 0.480
field12779 40 00:01:54 00:04:01 0.474
field12780 40 00:01:54 00:04:06 0.463
field12781 40 00:01:54 00:04:46 0.400
field12782 40 00:01:54 00:04:06 0.463
field12783 40 00:01:54 00:04:38 0.411
GB63_dither_test OH 64 00:03:03 00:14:48 0.206
GB63_dither OH 72 00:03:25 00:07:29 0.458
GB62_dither OH 72 00:03:25 00:07:13 0.475
GB61_dither OH 72 00:03:25 00:07:31 0.456
GB60_dither OH 72 00:03:25 00:07:14 0.474
GB59_dither OH 72 00:03:25 00:07:14 0.474
GB58_dither OH 72 00:03:25 00:07:22 0.465
GB57_dither OH 72 00:03:25 00:07:08 0.480
GB74_dither OH 72 00:03:25 00:07:39 0.448
GB75_dither OH 72 00:03:25 00:07:04 0.486
GB76_dither OH 72 00:03:25 00:07:21 0.466
GB77_dither OH 72 00:03:25 00:07:16 0.471
GB78_dither OH 72 00:03:25 00:07:31 0.456
GB79_dither OH 72 00:03:25 00:07:36 0.451
GB80_dither OH 72 00:03:25 00:07:00 0.490
GB97_dither OH 72 00:03:25 00:07:14 0.474
GB96_dither OH 72 00:03:25 00:07:45 0.443
GB95_dither OH 72 00:03:25 00:07:14 0.474
GB94_dither OH 72 00:03:25 00:07:00 0.490
GB93_dither OH 72 00:03:25 00:07:03 0.487
GB92_dither OH 72 00:03:25 00:07:11 0.477
GB91_dither OH 72 00:03:25 00:07:17 0.471
GB108_dither OH 72 00:03:25 00:07:56 0.432
GB109_dither OH 68 00:03:14 00:07:32 0.430
GB110_dither OH 48 00:02:17 00:04:57 0.461
GB111_dither OH 64 00:03:03 00:17:01 0.179
GB112_dither OH 48 00:02:17 00:05:09 0.444
GB113_dither OH 48 00:02:17 00:04:41 0.488
GB114_dither OH 48 00:02:17 00:04:58 0.461
GB131_dither OH 48 00:02:17 00:04:57 0.461
GB130_dither OH 52 00:02:28 00:19:22 0.128
GB130_dither_test OH 44 00:02:05 00:20:51 0.101
GB129_dither OH 48 00:02:17 00:04:49 0.474
GB128_dither OH 48 00:02:17 00:04:41 0.488
GB127_dither OH 48 00:02:17 00:04:55 0.465
GB126_dither OH 48 00:02:17 00:04:41 0.488
GB125_dither OH 48 00:02:17 00:05:26 0.421
GCsky 48 00:02:17 00:06:52 0.333
GB111_dither_test OH 32 00:01:31 00:05:55 0.257










Stats so far in 2025
Monthly observed fraction so far in 2025
Month Observed Time
(hh:mm:ss) 		Expected Time
(hh:mm:ss) 		Observed Fraction
(observed/expected)
Jan 103:35:29 259:42:08 0.399
Feb 53:54:42 259:20:18 0.208
Mar 158:57:47 319:07:20 0.498
Apr 71:16:30 177:05:24 0.402

Observed time so far in 2025
- Total time of each institute is calculated by the following
    [All observation time in 2025] = [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 2025] = [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 2025] = [All observation time in 2025] - [GB observation time in 2025]
    
    [OU, NASA, ABC time in 2025] = 0.24 x [Non-GB observation time in 2025]
    [SAAO time in 2025] = 0.28 x [Non-GB observation time in 2025]
    
- 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 1769:00:49 897:48:02 871:12:46 243:56:22 209:05:28 209:05:28 209:05:28 116:25:22
Observed 387:44:27
(21.92%)		 124:01:59
(13.82%)		 263:42:28
(30.27%)		 34:44:42
(14.24%)		 64:36:31
(30.90%)		 133:29:04
(63.84%)		 30:52:08
(14.76%)		 116:25:22
(N/A)
Remaining 1381:16:22
(78.08%)		 773:46:03
(86.18%)		 607:30:18
(69.73%)		 209:11:39
(85.76%)		 144:28:56
(69.10%)		 75:36:23
(36.16%)		 178:13:19
(85.24%)		 00:00:00
(N/A)











Camera status (2025/04/16)