PRIME Observation Log 2025/04/20

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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: 2025/04/20
Local observer: Seiya Nakayama
Remote observer:
Weather: mist
Comment:
Detector Temperature: 114.00019 +- 0.00136 K
ImageAcquisitionErrors occurred 0 times

Expected Time
Twilight Flat Time
(Sun altitude = -5.5°)
Evening 18:31:50
Morning 06:39:35
Science Observation
(Sun altitude < -10°)
Start 18:53:24
End 06:17:59
Bulge Observation
(Sun alt. < -10° & GB alt. > 22°)
Start 22:41:25
End 06:17:59


Observed Fraction
Actually Observed Time
(hh:mm:ss) 		Expected Observation Time
(hh:mm:ss) 		Observed Fraction
(observed/expected)
Total Time 01:53:02 11:24:34 0.165
GB Time 00:00:00 07:36:33 0.000
Non-GB Time 01:53:02 03:48:00 0.496


Institute Statistics
Institute Total Frame Total Exposure
(hh:mm:ss) 		Total Observation
(hh:mm:ss) 		Efficiency
(exp./obs.)
NASA 1330 01:03:23 01:53:02 0.561
CALIB 204 00:09:43 00:18:31 0.525


Type Statistics
Type Total Frame Total Exposure
(hh:mm:ss) 		Total Observation
(hh:mm:ss) 		Efficiency
(exp./obs.)
ToO 1330 01:03:23 01:53:02 0.561
TWILIGHT 204 00:09:43 00:18:31 0.525


Target Statistics
Target Total Frame Total Exposure
(hh:mm:ss) 		Total Observation
(hh:mm:ss) 		Efficiency
(exp./obs.)
field18386 405 00:19:18 00:31:38 0.610
FLAT_test OH 4 00:00:11 00:01:01 0.185
FLAT OH 200 00:09:32 00:17:29 0.545
field18386_test 80 00:03:48 00:10:58 0.347
field19628 400 00:19:04 00:32:23 0.589
field18073_test 50 00:02:23 00:07:12 0.331
field18073 395 00:18:49 00:30:49 0.611










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 99:19:02 222:33:28 0.446

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 1774:19:20 897:32:14 876:47:06 245:29:59 210:25:42 210:25:42 210:25:42 118:42:36
Observed 415:47:00
(23.43%)		 138:45:35
(15.46%)		 277:01:24
(31.60%)		 36:03:07
(14.69%)		 65:54:56
(31.32%)		 142:52:47
(67.90%)		 32:10:32
(15.29%)		 118:42:36
(N/A)
Remaining 1358:32:20
(76.57%)		 758:46:38
(84.54%)		 599:45:41
(68.40%)		 209:26:51
(85.31%)		 144:30:45
(68.68%)		 67:32:54
(32.10%)		 178:15:09
(84.71%)		 00:00:00
(N/A)











Camera status (2025/04/20)