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.
The following FWHM image quality statistics were taken from the LRS pre-imaging statistics and FIF acquisition guider for science operations in the night report.
For comparison here is the LRS pre-imaging quality for the same period of 2006
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 seventh 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:Average Night Length | C:Fraction of Total Science Time Lost due to Weather | D: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 Calibrations | D:Fraction of Actual Science Time Lost due to Alignment | F:Fraction of Actual Science Time Lost due to Problems | Fraction of Actual Science Time Not accounted for or Lost |
---|---|---|---|---|---|---|---|---|---|
April | 0.999 | 8.25 | 0.28 | 0.57 | 0.30 | 0.02 | 0.04 | 0.05 | 0.01 |
May | 0.965 | 7.22 | 0.49 | 0.59 | 0.31 | 0.02 | 0.04 | 0.13 | 0.01 |
June | 0.998 | 6.66 | 0.34 | 0.57 | 0.33 | 0.03 | 0.02 | 0.04 | 0.01 |
July | 0.995 | 6.96 | 0.52 | 0.55 | 0.32 | 0.02 | 0.07 | 0.03 | 0.02 |
The last column accounts for all of the minutes lost or not used. Some of this time is accounting errors, some is time not charged to any program due to operations inefficiency and some is due to uncharged overheads from observations that did not result in a fits file.
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 |
---|---|---|---|---|---|
April | 0.23 | 0.37 | 0.20 | 0.10 | 0.10 |
May | 0.19 | 0.29 | 0.16 | 0.13 | 0.23 |
June | 0.13 | 0.23 | 0.37 | 0.10 | 0.17 |
July | 0.13 | 0.16 | 0.29 | 0.19 | 0.23 |
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 |
1185 | 206.2 | A - Acceptable |
48 | 9.5 | B - Acceptable but Border line conditions |
580 | 78.6 | 4 - Priority 4 visits (does not include 1/2 charge) |
0 | 0.0 | Q - charged but PI error |
0 | 0.0 | C - Acceptable by RA but PI rejects |
Uncharged exposures | ||
---|---|---|
Number of Times | Shutter Open (Hours) | Type |
0 | 0.0 | I - Targets observed under otherwise idle conditions |
9 | 2.1 | E - Rejected by RA for Equipment Failure |
16 | 2.0 | H - Rejected for Human failure |
107 | 17.4 | W - Rejected by RA for Weather |
9 | 2.0 | P - Rejected by PI and confirmed by RA |
13 | 2.0 | N - Rejected due to unknown cause |
So this is a total of 25.5 hours of uncharged spectra with an additional possible 9.5 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 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.
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".
The average overhead per actual visit is the overhead for each acceptable priority 0-3 (not borderline, and with overheads > 4 minutes to avoid 2nd half of exposures with unrealisticly low overheads) science target. This number reflects how quickly we can move from object to object on average for each instrument, however, this statistic tends to weight the overhead for programs with large number of targets such as planet search programs.
The average overhead per requested visit is the total charged overhead per requested priority 0-3 visit averaged per program. To get this value we average the average overhead for each program as presented in the program status web pages. The average overhead per visit can be inflated by extra overhead charged for PI mistakes (such as bad finding charts or no targets found at sky detection limits) or for incomplete visits e.g. 2 visits of 1800s are done instead of 1 visit with a CRsplit of 2. The average overhead per visit can be deflated by the 15 minute cap applied to the HRS and MRS. This method tends to weight the overhead to programs with few targets and bad requested visit lengths, ie. very close to the track length.
Instrument | Avg Overhead per Actual Visit(min) | Avg Overhead per Requested Visit(min) | Avg Exposure (sec) | Median Exposure (sec) | Max Exposure (sec) | Avg Visit (sec) | Median Visit (sec) | Max Visit (sec) |
---|---|---|---|---|---|---|---|---|
LRS | 13.5 | 15.7 | 745.4 | 600 | 2400 | 1330.9 | 1200 | 3642 |
HRS | 7.7 | 8.9 | 574.2 | 520 | 2508 | 733.9 | 609 | 5000 |
MRS | 12.8 | 8.3 | 1324 | 1000 | 2100 | 1407 | 1500 | 2100 |
NOTE: AS OF 2003-3 THE SETUP TIME FOR AN ATTEMPTED MRS OR HRS TARGET IS CAPPED AT 15 MINUTES. AS OF 2004-3 THE SETUP TIME FOR AN ATTEMPTED LRS TARGET IS CAPPED AT 20 MINUTES.
The overhead statistics can be shortened by multiple setups (each one counted as a separate 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.
A way to improve the overhead accumulated for programs with long exposure times is to add double the above overhead to the requested visit length and make sure that time is shorter than the actual track length. This avoids the RA having to split requested visits between several different tracks.
During this period we have had some trouble with LRS setups which have turned out to be training issues.
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.
Observing Programs Status
Program comments:
UT07-2-001: (Fisher) priority 1-3 LRS e2
UT07-2-002: (Cochran) priority 1-4 HRS, P1-3 complete
UT07-2-003: (Hippel) priority 1-2 HRS, program complete
UT07-2-004: (Edelmann) priority 2-4 HRS, P2-3 complete
UT07-2-005: (Prieto) priority 2-4 , LRS g2
UT07-2-006: (Ramirez) priority 2-3 HRS, program complete
UT07-2-009: (Benedict) priority 0-3 HRS, program complete
UT07-2-011: (Hill) priority 1-2, LRS g1
UT07-2-013: (Quimby) priority 0-2 LRS g1, TOO, P0,P2 targets completed
UT07-2-015: (Siegel) priority 2-3, HRS, P2 complete
UT07-2-016: (Hippel) priority 1-2,4 HRS, P1 complete
UT07-2-017: (Siegel) priority 2-3 LRS g3,
UT07-2-018: (Bean) priority 4 HRS
UT07-2-020: (Kormandy) priority 1 LRS g2, program complete
UT07-2-021: (Redfield) priority 0,3, HRS
UT07-2-022: (Wittenmeyer) priority 4, HRS
UT07-2-023: (Sneden) priority 1-4, HRS, P1-3 complete
UT07-2-024: (Prieto) priority 0, HRS daysky
Factoring submitted targets, Completion Rates are: P0 = 96%, P1 = 98%, P2 = 62%, P3 = 60%
Program comments:
PSU07-2-001: (Wolszczan) priority 3-4 HRS, P3 complete
PSU07-2-002: (Wolszczan) priority 1-4 HRS, P1-3 complete
PSU07-2-003: (Miller) priority 2, HRS
PSU07-2-004: (Gronwall) priority 1-2, LRS g1, program complete
PSU07-2-006: (Palma) priority 1-2, LRS g3, P1 complete
PSU07-2-007: (Fox) priority 0-1, LRS g1, TOO, program complete
PSU07-2-008: (Grupe) priority 4, LRS g2
PSU07-2-009: (Schneider) priority 2 LRS g1, program complete
PSU07-2-010: (Eracleous) priority 1-3 LRS g3
PSU07-2-011: (Brown) priority 0-1, LRS g1, TOO, program complete
PSU07-2-012: (Wade) priority 3-4, MRS
PSU07-2-013: (Wade) priority 3, HRS,
PSU07-2-014: (Brandt) priority 1, LRS g2, program complete
PSU07-2-015: (Gibson) priority 2-3, LRS g2, P2 complete
PSU07-2-101: (Brandt) priority 1-2, LRS g2, program complete
PSU07-2-102: (Zeimann) priority 1-2, LRS g2, program complete
PSU07-2-109: (Schneider) priority , LRS , no submitted targets
Factoring submitted targets, Completion Rates are: P0 = 100%, P1 = 99%, P2 = 85%, P3 = 60%
Program comments:
STA07-2-001: (Romani) priority 0-4 LRS g1, P0-1 complete
STA07-2-002: (Romani/Sako) priority 2-4 LRS g1, P2 complete
STA07-2-003: (Cheung/Healey) priority 2-4, LRS g1
Factoring submitted targets, Completion Rates are: P0 = 100%, P1 = 100%, P2 = 80%, P3 = 0%
Program comments:
M07-2-001: (Bender) priority 0-1, HRS, program complete
M07-2-002: (Wilman) priority 1-3, LRS g1 mos
M07-2-003: (Burwitz) priority 1-3, LRS_g1
M07-2-004: (Saglia) priority 1-3, LRS e2, P1 complete
M07-2-005: (Saglia) priority 2, LRS e2 1x1, program complete
Factoring submitted targets, Completion Rates are: P0 = 100, P1 = 85%, P2 = 25%, P3 = 5%
Program comments:
G07-2-001: (Kollatschny) priority 1-3 LRS g2, P1 complete
G07-2-002: (Reiners) priority 1-3 HRS, program complete
G07-2-003: (Kollatschny) priority 1 LRS g2, program complete
G07-2-005: (Shuh) priority 1 HRS, program complete
Factoring submitted targets, Completion Rates are: P0 = N/A, P1 = 100%, P2 = 92%, P3 = 50%
Institution Status
Time Allocation by Institution (hours) | |||||
---|---|---|---|---|---|
Institution | Priority 0 | Priority 1 | Priority 2 | Priority 3 | Priority 4 |
PSU | 7.000 | 22.250 | 31.030 | 28.330 | 71.750 |
UT | 10.600 | 54.400 | 71.600 | 68.700 | 76.000 |
Stanford | 3.000 | 6.000 | 9.0000 | 9.000 | 12.000 |
Munich | 2.000 | 15.060 | 11.000 | 10.000 | 0.000 |
Goetting | 0.000 | 4.300 | 5.500 | 4.300 | 0.000 |
NOAO | 0.000 | 17.430 | 64.760 | 48.800 | 0.000 |
SALT | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 |
DDT | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 |
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.
Time Charged by Institution (hours) | |||||
---|---|---|---|---|---|
-INST- | Used THIS PERIOD | % of All THIS PERIOD | -TOTAL TO DATE- | -% TO DATE- | - % ALLOCATION TO DATE- |
PSU | 86.2 | 27.7 | 1791.7 | 28.7 | 29.13% |
UT | 182.2 | 58.6 | 3532.9 | 56.5 | 54.94% |
Stanford | 15.8 | 5.1 | 444.9 | 7.1 | 6.66% |
Munich | 15.1 | 4.9 | 262.0 | 4.2 | 4.64% |
Goetting | 11.6 | 3.7 | 220.1 | 3.5 | 4.63% |
NOAO | N/A | -- | -- | -- | -- |
SALT | 0.00 | -- | -- | -- | -- |
DDT | 0.00 | -- | -- | -- | -- |
Total to Date starting from Oct 1999.
Priority weighting for P4 began in the 2003-2 period.
The following is a histogram of the current HET queue visits at the end of
the period.
The following histogram shows the bright time priority 0-4 contribution from each partner.
The following histogram shows the dark time priority 0-3 contribution from each partner.
The following histogram shows the use of LRS_g2, LRS_g3 and LRS_e2 for priority 0-2 programs in this period.
From the above plots I have determined that: