PRIME Observation Log 2025/08/22

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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: 2025/08/22
Local observer: Asahi
Remote observer:
Weather: windy
Comment:
Detector Temperature: 113.99980 +- 0.00707 K
ImageAcquisitionErrors occurred 2 times @
2025-08-22 19:06:28 SAT
2025-08-22 19:16:49 SAT

Expected Time
Twilight Flat Time
(Sun altitude = -5.5°)
Evening 18:36:26
Morning 06:42:05
Science Observation
(Sun altitude < -10°)
Start 18:58:01
End 06:20:32
Bulge Observation
(Sun alt. < -10° & GB alt. > 22°)
Start 18:58:01
End 02:03:10


Observed Fraction
Actually Observed Time
(hh:mm:ss) 		Expected Observation Time
(hh:mm:ss) 		Observed Fraction
(observed/expected)
Total Time 01:03:13 11:22:31 0.093
GB Time 00:00:00 07:05:09 0.000
Non-GB Time 01:03:13 04:17:21 0.246


Institute Statistics
Institute Total Frame Total Exposure
(hh:mm:ss) 		Total Observation
(hh:mm:ss) 		Efficiency
(exp./obs.)
NASA 714 00:34:02 01:03:13 0.538
CALIB 391 00:18:38 00:20:55 0.891


Type Statistics
Type Total Frame Total Exposure
(hh:mm:ss) 		Total Observation
(hh:mm:ss) 		Efficiency
(exp./obs.)
ToO 714 00:34:02 01:03:13 0.538
calibration 391 00:18:38 00:20:55 0.891


Target Statistics
Target Total Frame Total Exposure
(hh:mm:ss) 		Total Observation
(hh:mm:ss) 		Efficiency
(exp./obs.)
no_grid_test 32 00:01:31 00:18:41 0.082
no_grid 682 00:32:30 00:44:31 0.730
reset 40 00:01:54 00:03:41 0.516
Dark 351 00:16:43 00:17:13 0.971










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 161:02:39 338:08:53 0.476
May 244:24:55 372:31:50 0.656
Jun 209:59:39 370:50:11 0.566
Jul 224:49:02 377:25:14 0.596
Aug 155:35:31 256:17:04 0.607

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 1924:19:51 997:43:35 926:36:15 259:26:57 222:23:06 222:23:06 222:23:06 176:36:13
Observed 1312:07:23
(68.19%)		 836:37:59
(83.85%)		 475:29:23
(51.32%)		 102:46:47
(39.61%)		 106:59:15
(48.11%)		 194:05:17
(87.28%)		 71:38:03
(32.21%)		 176:36:13
(N/A)
Remaining 612:12:27
(31.81%)		 161:05:35
(16.15%)		 451:06:52
(48.68%)		 156:40:09
(60.39%)		 115:23:51
(51.89%)		 28:17:48
(12.72%)		 150:45:02
(67.79%)		 00:00:00
(N/A)











Camera status (2025/08/22)



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