In this section we will discuss the status of each instrument and any limitation to configurations that occurred during the period.
The following image quality statistics were taken from the statistics recorded for science operations in the night report.
For comparison here is the image quality for the same period of 2002
Here are the DIMM values reported in the night report.
Month by Month Summary
The following table gives the observing statistics for each month. The second column 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 twilight or the first science target. Science time is defined to end at 18 degree twilight or the last science target. The fourth column gives the fraction of the possible science time (A) lost due to weather. The fifth through tenth columns give how the remaining science time (after removing weather losses) was spent. 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:Average Night Length | C:Fraction of Total Science Time Lost due to Weather | D:Fraction of Actual Science Time with Shutter Open | E:Fraction of Actual Science Time as Overhead | F:Fraction of Actual Science Time Lost due to Alignment | G:Fraction of Actual Science Time Lost due to Calibrations | H:Fraction of Actual Science Time Lost due to Problems | I:Fraction of Actual Science Time Not accounted for or Lost |
---|---|---|---|---|---|---|---|---|---|
August | 0.063 | 7.87 | 0.40 | 0.45 | 0.33 | 0.00 | 0.02 | 0.14 | 0.05 |
September | 0.004 | 8.94 | 0.00 | 0.52 | 0.31 | 0.17 | 0.00 | 0.00 | 0.00 |
October | 0.591 | 9.89 | 0.24 | 0.45 | 0.24 | 0.07 | 0.06 | 0.09 | 0.09 |
November | 0.790 | 10.61 | 0.22 | 0.49 | 0.28 | 0.06 | 0.04 | 0.06 | 0.08 |
The last column is new and acounts for all of the lost or not used minutes. Some of this time is accounting errors and some is time not charged to any program due to operations inefficiency.
Details on Nightly cloud cover based on the TO's observations of the sky reported 3 times a night in the night report.:
Month | Fraction of the Nights that were Clear | Fraction of the Nights that were Mostly Clear | Fraction of the Nights that were Partly Cloudy | Fraction of the Nights that were Mostly Cloudy | Fraction of the Nights that were Cloudy |
---|---|---|---|---|---|
August | 0.19 | 0.00 | 0.63 | 0.19 | 0.00 |
September | 0.43 | 0.00 | 0.13 | 0.00 | 0.10 |
October | 0.48 | 0.07 | 0.19 | 0.07 | 0.19 |
November | 0.31 | 0.24 | 0.28 | 0.07 | 0.07 |
Please note that the HET could be closed due to humidity, smoke or high dust count and still have a "Clear" statistic in the night report.
The following tables give a break down of all attempted visits as well as the category that each falls into.
Charged exposures | ||
---|---|---|
Number of Times | Shutter Open (Hours) | Type |
474 | 107.0 | A - Acceptable |
31 | 7.7 | B - Acceptable but Border line conditions |
151 | 24.5 | 4 - Priority 4 visits (does not include 1/2 charge) |
4 | 1.4 | Q - charged but PI error |
0 | 0.0 | C - Acceptable by RA but PI rejects |
Uncharged exposures | ||
---|---|---|
Number of Times | Shutter Open (Hours) | Type |
19 | 2.9 | I - Targets observed under otherwise idle conditions |
12 | 1.9 | E - Rejected by RA for Equipment Failure |
17 | 1.8 | H - Rejected for Human failure |
81 | 12.8 | W - Rejected by RA for Weather |
0 | 0.0 | P - Rejected by PI and confirmed by RA |
3 | 0.9 | N - Rejected due to unknown cause |
So this is a total of 20.3 hours of uncharged spectra with an additional possible 7.7 hours of spectra that may be rejected.
The following overhead statistics include slew, setup, readout and refocus between exposures (if there are multiple exposures per visit). In the summary page for each program the average charged setup time is calculated. The table below gives the average setup time for each instrument PER VISIT and the average and maximum COMPLETED science exposures and visits. NOTE: As of 2003-3 the overhead for HRS and MRS attempted visits is capped at 15 minutes.
The "Exposure" is defined by when the CCD 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".
Instrument | Avg Overhead per Actual Visit(min) | Avg Charged Overhead per Requested Visit(min) | Median Charged Overhead per Requested Visit (min) | Avg Exposure (sec) | Median Exposure (sec) | Max Exposure (sec) | Avg Visit (sec) | Median Visit (sec) | Max Visit (sec) |
---|---|---|---|---|---|---|---|---|---|
LRS | 14.2 | 18.3 | 17.5 | 792.6 | 1200 | 1800 | 1518.5 | 1350 | 3600 |
HRS | 10.6 | 13.3 | 10.9 | 714.5 | 900 | 2105 | 1003.2 | 900 | 4800 |
MRS | 12.6 | 10.4 | 10.4 | 1200 | 600 | 1800 | 1200 | 600 | 1800 |
NOTE: AS OF 2003-3 THE SETUP TIME FOR AN ATTEMPTED MRS OR HRS TARGET IS CAPPED AT 15 MINUTES.
The overhead statistics can be shortened by multiple setups (each one
counted as a seperate visit) while on the same target as is the case
for planet search programs. The overhead statistics can be lengthened by
having multiple tracks that add up to a single htopx visit as can happen
for very long tracks where each attempt might only yield a half visit.
The following is a histogram of the final HET queue visits. The last days
of the period there were significant holes.
The following links give the summary for each institution and its programs.
The resulting table will give (for each program) the total number of targets
in the queue and the number completed, the CCD shutter open
hours, average overhead for that program, and the TAC allocated time.
This usually will be the best
metric for judging completeness but there are times when a PI will tell
us that a target is "done" before the total number of visits is complete.
This is how each institution has allocated its time by priority.
The following is a summary of the Acceptable CCD shutter time for each
institution based on our night report data base. It does not include any
overhead. Priority 4 time is charge at 0.5 of the visits completed.
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 and overhead. Priority 4 time is charged at
half its normal rate and without overhead.
The original "TOTAL TO DATE" was found to be in error on
Dec. 11 2003; it did not include the overhead time. The values
given here in red are the corrected totals.
Observing Programs Status
Program comments:
UT03-3-002: (Cochran) Only P4 time remaining
Including MRS programs and factoring submitted targets, Completion Rates are: P0 = 100%, P1 = 87%, P2 = 76%, P3 = 49%
UT03-3-006: (Endl) All P1-P3 targets completed.
UT03-3-007: (Hill) All submitted targets completed
UT03-3-011: (Gebhardt) LRS g2 program.
UT03-3-012: (Cochran) All submitted targets completed
UT03-3-013: (Hynes) TOO program. No targets submitted
UT03-3-014: (Prieto) Day sky program.
UT03-3-016: (Kormendy) Only P3 targets remain.
UT03-3-020: (Wheeler) TOO program. No targets submitted
Program comments:
PSU03-3-001: (Eracleous) TOO program. No targets submitted
Including MRS programs and factoring submitted targets, Completion Rates are: P0 = 100%, P1 = 80%, P2 = 85%, P3 = 47%
PSU03-3-035: (Palma) All submitted targets completed
PSU03-3-036: (Schneider) Program completed
PSU03-3-042: (Schneider) Program submitted late and G3 no longer mounted.
Program comments:
Including MRS programs and factoring submitted targets, Completion Rates are: P0 = 100%, P1 = 52%, P2 = 60%, P3 = 0%
Program comments:
MUN03-3-001: (Saglia) Synoptic program, on schedule
Including MRS programs and factoring submitted targets, Completion Rates are: P0 = 100%, P1 = 41%, P2 = 100%, P3 = 100%
Program comments:
G03-3-001: (Schuh) Synoptic program for late November
Including MRS programs and factoring submitted targets, Completion Rates are: P0 = 100%, P1 = 79%, P2 = 100%, P3 = 100%
Institution Status
Time Allocation by Institution (hours) Institution Priority 0 Priority 1 Priority 2 Priority 3 Priority 4 PSU 6.000 (9%) 15.520 (23%) 20.570 (31%) 16.460 (24%) 8.800 (13%) UT 11.500 (6%) 35.000 (19%) 47.000 (26%) 41.500 (23%) 45.000 (25%) Stanford 0.000 4.000 (33%) 4.000 (33%) 2.000 (17%) 2.000 (17%) Munich 0.000 13.700 (100%) 0.000 0.000 0.000 Goetting 0.000 4.700 (100%) 0.000 0.000 0.000 NOAO 0.000 41.370 (54%) 29.510 (38%) 6.000 (8%) 0.000 SALT 0.000 0.000 0.000 0.000 0.000 DDT 0.000 0.000 0.000 0.000 0.000
CCD shutter Open by Institution (hours) -TOTAL- Used % of All PSU 28.01 23.8 UT 75.91 64.6 Stanford 6.96 5.9 Munich 3.70 3.1 Goetting 3.00 2.6 NOAO 18.91 -- SALT 0.00 -- DDT 0.00 --
Time Charged by Institution (hours) -INST- Used % of All -TOTAL TO DATE- -% TO DATE- PSU 40.24 25.5 727.5 29.0 UT 101.01 64.0 1432.8 57.1 Stanford 7.21 4.6 187.7 7.5 Munich 5.65 3.6 65.7 2.6 Goetting 3.73 2.4 94.6 3.8 NOAO N/A -- -- -- SALT 0.00 -- -- -- DDT 0.00 -- -- --
Total to Date starting from Oct 1999.