HET End-Trimester Report
Third Period of 2019
August 1 - November 30

This report is composed of five sections:
Facility Status

In this section we will discuss the status of the HET facility and each instrument and any limitation to configurations that occurred during the period.



Observing Statistics

Commissioning and Engineering Report There were 146 hours granted for engineering in the 19-3 period:

There were 133 hours of engineering used (charged) in the 19-2 period, in the following categories:

In 19-3 for the first time, the engineering, commissioning, and GTO requests were collected by the Science Operations Manager, and presented to the board. After the board approved these "off the top" allocations, the Science Operations Manager determined the TAC allocations and notified the TAC chairs at each partner institution, as described in the "Institution Status" section.




Month by Month Summary

The following table gives the observing statistics for each month. Column A gives the fraction of the month that was spent attempting science (as opposed to engineering or instrument commissioning). Science time is defined to begin at 18 degree evening twilight and end at 18 degree morning twilight. Column B gives the fraction of the possible science time (A) lost due to weather. The other columns give the amount of remaining science time (after removing weather losses) not spent attempting science targets. Please note that the first stack of the night often occurs before 18 degree twilight.

Month A:
Fraction of the Time that was Possible Science 		B:
Fraction of Total Time Lost due to Weather		 C:
Fraction of Actual Science Time Spent with Shutter Open 		D:
Fraction of Actual Science Time Lost due to Overhead 		E:
Fraction of Actual Science Time Lost due to Alignment		 F:
Fraction of Actual Science Time Lost due to Problems		 G:
Fraction of Actual Science Time Not accounted for or Lost
Aug 0.881
 0.397
 0.633
 0.234
 0.039
 0.093
 0.0005
Sep 0.843
 0.452
 0.664
 0.232
 0.043
 0.060
 0.0011
Oct 0.830
 0.303
 0.661
 0.256
 0.031
 0.053
 0.0000
Nov 0.901
 0.523
 0.667
 0.260
 0.041
 0.031
 0.0003

The following tables give a break down of all attempted science visits as well as the category that each falls into.

Charged exposures
Number of Times Shutter Open (Hours) Type
2452 353.35 A - Acceptable
157 34.65
 B - Acceptable but Border line conditions
194
 38.60
 4 - Priority 4 visits (does not include 1/2 charge)
3
 0.18 Q - charged but PI error
0 0.0 C - Acceptable by RA but PI rejects

Uncharged exposures caught by RA
Number of Times Shutter Open (Hours) Type
11 3.32 N - Rejected due to unknown cause
35 5.18 E - Rejected for Equipment Failure
240
 51.93 W - Rejected for Weather
14 2.85 H - Rejected for Human failure

Uncharged exposures caught by PI
Number of Times Shutter Open (Hours) Type
8
 3.37 P - Rejected for weather
0 0.0 F - Rejected for Equipment Failure
0 0.0 T - Rejected for poor track choice
0 0.0 X - Rejected for Human failure

Acceptable but Uncharged exposures
Number of Times Shutter Open (Hours) Type
1
 0.13 I - Targets observed under otherwise idle conditions

The following setup statistics include slew, acquisition, and starting data collection script. The table below gives the average setup time for each instrument PER ACTUAL VISIT and the average and maximum COMPLETED charged science exposures and visits.

The "Exposure" is defined by when the (CCD) shutter opens and closes. A "Visit" is the requested total CCD shutter open time during a track and might be made up of several "Exposures". "Visit" as defined here contains no overhead. To calculate one type of observing efficiency metric one might divide the "Visit" by the sum of "Visit" + "Overhead".

The average setup per visit is calculated from acceptable priority 0-3 (not borderline) science targets. This number reflects how quickly we can move from object to object on average for each instrument, however, this statistic tends to weight the setup for programs with large number of targets.

The average overhead percentage is calculated for each instrument and shows how much of that instrument's total time on sky (overhead+exposure) was overhead. NB: LRS2 has the smallest overhead %, but typical LRS2 observations use much longer exposures than VIRUS, even though VIRUS has a faster average setup time.

Instrument Avg Setup per Visit
(min)		 Total time exposed
(hrs)		 Overhead
%
VIRUS 4.53 231.87
 26.15%
LRS2 6.12 153.67
 22.05%
HPF 7.12 269.17
 26.69%

The setup statistics can be shortened by multiple setups (each one counted as a separate visit) while on the same target such as moving from LRS2-B to LRS2-R.



Observing Programs Status

In the table below we show the breakdown of the charged time for each program submitted. The "Total %" is the completion of the entire TAC time including P4 time. The last four columns show the completion rate for targets submitted in each priority bin. This completion rate is the greater of the targets completed percentage and the TAC allocation completed percentage in each priority bin.
Institution Total Open Tot OH Tot Chrg Tot TAC Total % P0 Completion P1 Completion P2 Completion P3 Completion










G19-3-001 0.77 0.21 0.98 0.97 100%
100%

G19-3-002 0.77 0.25 1.02 0.96 100%

100%
G19-3-003 0.45
 0.19
 0.63
 0.97
 65%


65%










M19-3-001 4.00 0.53 4.53 7.60 60%
100%
 70%
M19-3-002 5.50
 1.55
 7.05
 10.00
 71%
100%
 100%
 50%
M19-3-003 0.30
 0.12
 0.42
 1.50
 28%
 50%
 NT

M19-3-004 0.00
 0.00
 0.00
 1.50
 0%


0% HC
M19-3-005 0.00
 0.00
 0.00
 2.00
 0%(P4)













PSU19-3-001 0.79
 0.38
 1.16
 2.58
 45%


100%
PSU19-3-002 0.50
 0.13
 0.63
 0.83
 76%


100%
PSU19-3-003 5.02
 1.14
 6.16
 6.33
 97%
 100%
 100%
 100%
PSU19-3-004 4.00
 0.67
 4.67
 4.67
 100%
100%

PSU19-3-005 2.00
 0.46
 2.46
 3.33
 74%
 91%
 100%
 80%
PSU19-3-006 0.00
 0.00
 0.00
 1.34
 0%
 0% TD
 0% TD

PSU19-3-007 0.09
 0.16
 0.25
 0.26
 96%

100%
PSU19-3-008 4.58
 0.87
 5.45
 6.75
 81%

86%
PSU19-3-009 4.99
 1.09
 6.08
 11.55
 53%


53%
PSU19-3-010 0.31
 0.00
 0.31
 4.00
 8%(P4)



PSU19-3-011 1.99
 0.00
 1.99
 6.00
 33%(P4)



PSU19-3-012 0.21
 0.00
 0.21
 0.38
 55%(P4)



PSU19-3-013 2.28
 0.27
 2.55
 7.00
 36%
50%
 100%
PSU19-3-014 31.64
 7.98
 39.62
 39.98
 99%
 100%
 100%
 100%
 100%
PSU19-3-015 1.55
 0.58
 2.13
 1.85
 100%
 100%
 100%

PSU19-3-016 0.67
 0.52
 1.18
 1.00
 100%
 100%












UT19-3-001 0.00
 0.00
 0.00
 25.00
 0%(P4)
NT



UT19-3-002 5.10
 1.97
 7.07
 23.30
 30%
88%
 NT
 60%
UT19-3-003 5.64
 1.21
 6.85
 9.00
 76%
 100%
 100%
100%
UT19-3-004 2.00
 0.28
 2.28
 4.00
 57%


57%
UT19-3-005 3.11
 1.68
 4.79
 14.20
 34%


34%
UT19-3-006 2.00
 0.80
 2.80
 3.00
 93%
93%

UT19-3-007 6.60
 2.62
 9.22
 15.00
 61%
100%
 40%
UT19-3-008 14.20
 2.66
 16.86
 25.00
 67%
 100%

73%
UT19-3-009 10.25
 2.84
 13.09
 25.00
 52%
 100%
 99%

UT19-3-010 20.72
 10.62
 31.34
 47.60
 66%

91%
 55%
UT19-3-011 1.00
 0.28
 1.28
 1.33
 96%
100%

UT19-3-012 6.77
 3.48
 10.24
 14.80
 69%
 100%
 74%
 36%
UT19-3-013 6.03
 1.87
 7.89
 12.50
 63%
94%
 100%
UT19-3-014 6.42
 1.52
 7.93
 12.10
 66%
100%
 100%
UT19-3-015 3.05
 1.09
 4.13
 16.30
 25%


66%
UT19-3-016 2.40
 1.07
 3.47
 20.00
 17%
100%
 100%
UT19-3-017 15.31
 3.54
 18.85
 40.00
 47%
 100%
 89%
 100%
 50%
UT19-3-018 4.75
 0.97
 5.72
 9.00
 64%

100%
 0%
UT19-3-020 0.75
 0.51
 1.26
 7.00
 18%
63%

UT19-3-021 1.00
 0.20
 1.20
 1.00
 100%
 100%












HET19-3-100 79.80
 30.05
 109.85
 170.00
 65%
 65%


HET19-3-201 1.67
 0.27
 1.93
 2.00
 97%
 100%
 83%

HET19-3-201 1.50
 0.47
 1.97
 3.00
 66%
 100%
 50%

HET19-3-300 15.75
 4.27
 20.01
 20.4
 98%
 100%
 100%
 100%
HET19-3-400 2.00
 1.02
 3.02
 17.5
 17%
 100%












Institution Tot. Open
 Tot OH
 Tot Chrg
 Tot TAC
 Total %
 P0 completion
 P1 completion
 P2 completion
 P3 completion

NT = no targets submitted at this priority (even though time was allocated)
HC = HETDEX conflict (targets submitted were in direct competition with HETDEX; PI was aware of issue)
TD = Time Domain targets (either none submitted or submitted targets unreachable due to weather)



Program Completion Rates
Priority Average Completion Median Completion
P0 94.5% 100%
P1 91.0% 100%
P2 89.1% 100%
P3 64.2% 60%


Institution Status

Below we show how the TAC allocations were determined.

Breakdown of how TAC hours were determined
Parameter August September October
 November
 Total
18 Degree Twilight Hours 246.45 269.70
 307.33
 318.09
 1141.57
Engineering Hours 11.87 17.06 18.80 20.16 67.89
Operational Hours 234.59
 252.64
 288.53
 297.93
 1073.68
Observable Fraction 0.65
 0.65
 0.65
 0.65
Clear Science Hours 152.48
 164.21
 187.54
 193.66
 697.89
Telescope Efficiency 0.90
 0.90
 0.90
 0.90
Actual Science Hours 137.23
 147.79
 168.79
 174.29
 628.10
Instrument Eng/GTO Hours 60.00
 70.00
 70.00
 80.00
 280.00
Allocatable Hours 77.23
 77.79
 98.79
 94.29
 348.10

Partner Fractional Share Notes Total Hours
Goettingen 0.0084
2.92
Munich 0.0590
20.54
PSU 0.2568 Time trade = 89.39 - 4.75 84.64
UT 0.6757 Time trade = 235.21 + 4.75 239.96

TACs may allocate up to 8.3% at P0, 25% at P1, 33.3% at P2 and 33.3% at P3. P4 allocations are not restricted. GTO and engineering time are assigned by the HET board and not from this formula.


This is how each institution has allocated its time by priority in the 19-3 trimester.

Time Allocation by Institution (hours)

Institution Priority 0 Priority 1 Priority 2 Priority 3 Priority 4 Total P0-P3
 Frac. of allowed
Goettingen -
 0.97
 0.96
 0.97
 -
 2.90
 99.3%
Munich 1.00
 5.80
 6.80
 7.00
 2.00
 20.60
 100.3%
PSU 10.46
 20.38
 28.34
 28.29
 10.38
 87.47
 103.3%
UT 18.00
 61.33
 72.30
 68.50
 105.00
 220.13
 91.7%
Other allocations
GTO 193.60 11.20 8.10 -
 -
 212.90
 100.4%

Notes:
1) 8.3% of PSU's allocation (84.64h) is 7.03h, but 10.46h were allocated at P0, which is 3.43 hours too many.
2) The UT TAC could have allocated up to 79.9h each at P2 and P3, but instead left 19 hours un-allocated to any program.






The following is a summary of the total charged time for each institution based on our htopx data base (for shutter open) and night reports (for overhead). It includes shutter open time (weighting priority four by half) and overhead.

As requested by the board the time accounting has started over starting Fiscal year 2011-2012.

Time Charged by Institution (hours)
-INST- Hours charged
this period
 % of all
this period
 Total hours charged
to date
including 19-3		 % of all
to date
including 19-3 		Partner shares
in 19-3
Goettingen 2.63
 1.1%
 180.35
 3.8%
 0.84%
Munich 12.00
 4.9%
 234.00
 4.9%
 5.90%
PSU 74.86
 30.5%
 1363.70
 28.6%
 25.68%
UT 156.28
 63.6%
 2982.88
 62.7%
 67.57%



Below are the summaries of the Guaranteed Time Observations (GTO) programs granted by the Board:

GTO and Special Time Charged by Project (hours)
Project Allocated
in 19-3		 Allocated total
to date
including 19-3 		Charged
in 19-3		 Charged total
to date
including 19-3
HETDEX (HETYY-P-100) 170.0 1259.0 109.85 776.95
LRS2 GTO (HETYY-P-2XX) 5.0 125.94 3.9 58.94
HPF GTO (HETYY-P-3XX) 20.4 80.4 20.01 81.32
GW (HETYY-P-400) 17.5 35.0 3.02 8.22

(Totals to date start from the 11-2 period)








SJ, Jan 1 2020