HET Mid-Trimester Report
Second Period of 2002
April 1 - June 30

This report is composed of five sections:
Instrument Status

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


Observing Conditions

This period has been one of the worst in McDonald's history for cloudy weather. The following histogramm shows the percentage of clouds as reported by the TO. The TO records the amount of clouds 3 times per night every night (Note on extreemly bad nights the TO will close down the telescope and go home before the last cloud coverage is recorded).

In addition, there was time lost when there were no clouds due to high humidity or high particle count. During this period, 29 hours were lost to humidity and 12 hours to high particle count.

The image quality of the HET has improved a bit over last year although it is still fairly poor.

For comparison here is the image quality for the same period of 2001

The total number of acceptable shutter open hours during this period is 99 hours (as of June 25). This number is based upon our queue data base. There were a number of rejected spectra obtained during this period as well the following table give the total number of rejected spectra and the catagory that each falls into.

Number of TimesTime Lost (Hours)Type
51.9 E - Rejected by RA for Equipment Failure
40.9 H - Rejected by RA for Human failure
175.5 W - Rejected by RA for Weather
10.3 P - Rejected by PI and confirmed by RA
00.0 C - Acceptable by RA but PI rejects
20.3 N - Acceptable but NOT charged due to weather or hole in queue
164.3 B - Acceptable but Border line conditions

So this is a total of 8.6 hours of rejected spectra with an additional possible 4.3 hours of spectra that may be rejected.


Observing Programs Status

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, and will give the CCD shutter open hours, 10 minute overhead per visit, 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.


Institution Status

The following is a summary of the Acceptable CCD shutter time for each institution based on our htopx data base. It does not include any overhead.

Time Usage by Institution (hours)
-TOTAL- Used % of All
PSU 28.111 29.2
UT 52.813 54.8
Stanford 8.250 8.6
Munich 2.257 2.3
Goetting 5.000 5.2
NOAO 4.167 --
SALT 0.000 --
DDT 0.000 --

This is as of June 27, 2002.

This is how each institution has allocated its time by priority.

Time Allocation by Institution (hours)
Institution Priority 0 Priority 1 Priority 2Priority 3 Priority 4
PSU 1.670 (1%) 42.930 (26%) 42.000 (25%) 30.600 (18%) 49.000 (29%)
UT 24.000 (9%)103.400 (41%) 70.800 (28%) 54.500 (22%) 0.000
Stanford 0.000 21.750 (100%) 0.000 0.000 0.000
Munich 0.000 0.000 0.000 0.000 0.000
Goetting 0.000 0.000 0.000 0.000 0.000
NOAO 0.000 53.700 (73%) 20.000 (27%) 0.000 0.000
SALT 0.000 0.000 0.000 0.000 0.000
DDT 0.000 0.000 0.000 0.000 0.000


Future Priorities

The following are the high priority targets for the rest of the period for each institution:

UT02-2
RankProgram Constriants
1 UT02-2-004, N6702 LRS, 2.5 very long tracks, photometric , dark , EE50 < 4.0
2 UT02-2-009, GSS2 LRS, 5 very long tracks, photometric , dark , EE50 < 2.0
3 UT02-2-011 HRS, many short visits to 5 different targets, EE50 < 2.5

PSU02-2
RankProgramConstriants
1 PSU02-2-036 LRS-MOS, 5 long visits on 2 targets, dark , EE50 < 1.8
2 PSU02-2-039 LRS, 2 synoptic targets, grey , EE50 < 2.5
3 PSU02-2-033 LRS, 1.6 hours of priority 1 time, grey , EE50 < 2.0

STA02-2
RankProgramConstriants
1 STA02-2-001, all EG targets LRS, grey , EE50 < 2.5

MUN02-2
RankProgramConstriants
1 MUN02-2-002, NGC4827 LRS, 1 long tracks near evening twilight, photometric , dark , EE50 < 3.0
2 MUN02-2-002, I4045 LRS, 2 long tracks near evening twilight, photometric , dark , EE50 < 3.0

G02-2
RankProgramConstriants
All programs complete