PRIME Observation Log 2026/02/20

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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: 2026/02/20
Local observer:
Remote observer:
Weather:
Comment:
Detector Temperature: 112.01820 +- 0.01401 K
ImageAcquisitionErrors occurred 1 times @
2026-02-21 04:07:32 SAT

Expected Time
Twilight Flat Time
(Sun altitude = -5.5°)
Evening 19:44:54
Morning 05:56:17
Science Observation
(Sun altitude < -10°)
Start 20:07:18
End 05:33:52
Bulge Observation
(Sun alt. < -10° & GB alt. > 22°)
Start 02:34:22
End 05:33:52


Observed Fraction
Actually Observed Time
(hh:mm:ss) 		Expected Observation Time
(hh:mm:ss) 		Observed Fraction
(observed/expected)
Total Time 03:51:36 09:26:34 0.409
GB Time 02:31:23 02:59:30 0.843
Non-GB Time 01:20:12 06:27:04 0.207


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 1296 01:01:46 02:31:23 0.408
SAAO 171 00:08:09 00:20:03 0.406
OU 171 00:08:09 00:20:03 0.406
NASA 171 00:08:09 00:20:03 0.406
ABC 171 00:08:09 00:20:03 0.406


Type Statistics
Type Total Frame Total Exposure
(hh:mm:ss) 		Total Observation
(hh:mm:ss) 		Efficiency
(exp./obs.)
all_sky_grid 684 00:32:36 01:20:12 0.406
Bulge 1248 00:59:29 02:24:50 0.411
SKY 48 00:02:17 00:06:33 0.349


Target Statistics
Target Total Frame Total Exposure
(hh:mm:ss) 		Total Observation
(hh:mm:ss) 		Efficiency
(exp./obs.)
field6153_test 16 00:00:45 00:05:20 0.143
field6153 60 00:02:51 00:05:40 0.503
field6154 60 00:02:51 00:06:31 0.439
field6155 60 00:02:51 00:05:40 0.503
field6156 60 00:02:51 00:06:04 0.471
field6157 60 00:02:51 00:06:11 0.462
field6158 60 00:02:51 00:06:58 0.410
field6159 60 00:02:51 00:06:39 0.429
field6160 60 00:02:51 00:05:40 0.503
field6161 60 00:02:51 00:06:39 0.429
field6162 60 00:02:51 00:06:03 0.472
field6163 60 00:02:51 00:09:06 0.314
field1358_test 8 00:00:22 00:03:34 0.107
GB60_test OH 24 00:01:08 00:10:38 0.108
GB60_dither OH 48 00:02:17 00:05:00 0.457
GB74_dither OH 48 00:02:17 00:04:58 0.460
GB75_dither OH 48 00:02:17 00:05:12 0.440
GB76_dither OH 72 00:03:25 00:07:30 0.457
GB77_dither OH 72 00:03:25 00:07:27 0.460
GB78_dither OH 72 00:03:25 00:07:19 0.468
GB79_dither OH 48 00:02:17 00:04:49 0.474
GB80_dither OH 48 00:02:17 00:04:52 0.470
GB97_dither OH 48 00:02:17 00:04:35 0.498
GB96_dither OH 48 00:02:17 00:04:41 0.488
GB95_dither OH 48 00:02:17 00:04:52 0.470
GB94_dither OH 72 00:03:25 00:07:17 0.471
GB93_dither OH 48 00:02:17 00:04:54 0.466
GB92_dither OH 48 00:02:17 00:04:35 0.498
GB91_dither OH 48 00:02:17 00:04:55 0.465
GB108_dither OH 48 00:02:17 00:04:35 0.498
GB109_dither OH 72 00:03:25 00:15:01 0.228
GB110_dither OH 72 00:03:25 00:07:00 0.490
GB111_dither OH 72 00:03:25 00:06:57 0.493
GB112_dither OH 48 00:02:17 00:04:38 0.493
GB113_dither OH 48 00:02:17 00:04:35 0.498
GB114_dither OH 48 00:02:17 00:08:19 0.275
GCsky 48 00:02:17 00:06:33 0.349










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 71:22:28 182:16:59 0.392

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 1795:17:05 936:40:57 858:36:07 240:24:30 206:03:52 206:03:52 206:03:52 19:05:38
Observed 127:17:31
(7.09%)		 18:57:14
(2.02%)		 108:20:17
(12.62%)		 29:45:14
(12.38%)		 25:11:25
(12.22%)		 30:43:44
(14.91%)		 22:39:52
(11.00%)		 19:05:38
(N/A)
Remaining 1667:59:34
(92.91%)		 917:43:43
(97.98%)		 750:15:50
(87.38%)		 210:39:16
(87.62%)		 180:52:26
(87.78%)		 175:20:07
(85.09%)		 183:23:59
(89.00%)		 00:00:00
(N/A)











Camera status (2026/02/20)



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