PRIME Observation Log 2026/02/04

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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: 2026/02/04
Local observer:
Remote observer:
Weather:
Comment:
Detector Temperature: 112.00039 +- 0.00439 K
ImageAcquisitionErrors occurred 0 times

Expected Time
Twilight Flat Time
(Sun altitude = -5.5°)
Evening 20:00:37
Morning 05:41:04
Science Observation
(Sun altitude < -10°)
Start 20:24:03
End 05:17:37
Bulge Observation
(Sun alt. < -10° & GB alt. > 22°)
Start 03:37:16
End 05:17:37


Observed Fraction
Actually Observed Time
(hh:mm:ss) 		Expected Observation Time
(hh:mm:ss) 		Observed Fraction
(observed/expected)
Total Time 00:00:00 08:53:34 0.000
GB Time 00:00:00 01:40:21 0.000
Non-GB Time 00:00:00 07:13:13 0.000


Institute Statistics
Institute Total Frame Total Exposure
(hh:mm:ss) 		Total Observation
(hh:mm:ss) 		Efficiency
(exp./obs.)
CALIB 4158 03:18:11 04:47:22 0.690


Type Statistics
Type Total Frame Total Exposure
(hh:mm:ss) 		Total Observation
(hh:mm:ss) 		Efficiency
(exp./obs.)
calibration 4158 03:18:11 04:47:22 0.690


Target Statistics
Target Total Frame Total Exposure
(hh:mm:ss) 		Total Observation
(hh:mm:ss) 		Efficiency
(exp./obs.)
reset 270 00:12:52 00:47:37 0.270
Dark 1575 01:15:04 01:16:34 0.980
superbias 480 00:22:52 00:36:57 0.619
LSS_H_test 4 00:00:11 00:10:44 0.018
LSS_H 80 00:03:48 00:10:42 0.356
NLC_H 211 00:10:03 00:10:35 0.950
LSS_J 80 00:03:48 00:15:39 0.244
NLC_J 456 00:21:44 00:22:27 0.968
LSS_Y 80 00:03:48 00:07:16 0.524
NLC_Y 421 00:20:04 00:20:44 0.967
LSS_Z 80 00:03:48 00:07:16 0.524
NLC_Z 421 00:20:04 00:20:44 0.967










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 14:34:53 35:22:38 0.412

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 1811:56:41 939:41:07 872:15:34 244:13:57 209:20:32 209:20:32 209:20:32 09:44:44
Observed 70:29:56
(3.89%)		 02:56:56
(0.31%)		 67:33:00
(7.74%)		 16:11:40
(6.63%)		 16:14:23
(7.76%)		 21:24:04
(10.22%)		 13:42:51
(6.55%)		 09:44:44
(N/A)
Remaining 1741:26:44
(96.11%)		 936:44:10
(99.69%)		 804:42:34
(92.26%)		 228:02:16
(93.37%)		 193:06:08
(92.24%)		 187:56:27
(89.78%)		 195:37:41
(93.45%)		 00:00:00
(N/A)











Camera status (2026/02/04)



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