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Observing Request Statistics:...(1Jun93)
August 1993 - January 1994
(from CTIO, NOAO Newsletter No. 34, 1 June 1993)

The requests for second semester 1993 are unusual because the 4-m f/8 secondary,
normally used about half the time, is scheduled to be out of service for
refiguring during most of the semester. It is thus not surprising that there
has been a significant drop in the 4-m requests compared with the previous year,
just over 20%, although the telescope continues to be heavily oversubscribed.
(It should be noted that the relatively small drop with regard to the first
semester is a product of the normal seasonal pattern, where the 4-m sees
greatest demand second semester and the 1.5-m sees greatest demand first
semester.) What is striking is the parallel drop in requests on the smaller
telescopes, probably due to the fact that many 4-m projects also use small
telescope time.

4-m Telescope
 # of Requests     # of Nights Requested
 Dark  Bright         Dark    Bright       Instrument    Nights   %
   1      2             3       5            ASCAP          8    2.3
  16      8            57      24            Argus         81   22.8
   1      0             5       0           CF/CCD          5    1.4
  18      3            54      10           CS/CCD         64   18.0
   3      3             8      12          Ech/CCD         20    5.6
   0      4             0      15        IR/Imager         15    4.2
   0      1             0       4           IR/IRS          4    1.1
  25      0            79       0           PF/CCD         79   22.3
   2      0             4       0        PF/Plates          4    1.1
   1      1             4       3             RF-P          7    2.0
   1      0             4       0          Visitor          4    1.1
   1     16             4      60           OSIRIS         64   18.0
   -     --             -      --                          --   ----
  69     38           222     133                         355  100.0

                          Now         Last Semester    Semester Before Last
No. of Requests           107            108                124
No. of nights requested   355            362                452
Oversubscription         2.23           2.18               2.77
Average request          3.32           3.35               3.64
* 159 nights available



1.5-m Telescope
 # of Requests     # of Nights Requested
 Dark  Bright         Dark    Bright       Instrument    Nights    %
   2      2             9       1            ASCAP         20     6.6
  24      1           103       6           CF/CCD        109    36.2
  13      6            46      31           CS/CCD         77    25.6
   0      4             0      21          Ech/CCD         21     7.0
   0      2             0       7           IR/IRS          7     2.3
   0      3             0       9          IR/Phot          9     3.0
   1      0             8       0           PF/CCD          8     2.7
   2      2             8      13             RF-P         21     7.0
   0      7             0      29           OSIRIS         29     9.6
   -      -             -      --                          --     ---
  42     27           174     127                         301   100.0

                          Now         Last Semester    Semester Before Last
No. of Requests            69             68              61
No. of nights requested   301            366             324
Oversubscription         1.80           2.09            1.91
Average request          4.36           5.38            5.31
* 167 nights available



1.0-m Telescope
 # of Requests      # of Nights Requested
 Dark  Bright          Dark    Bright      Instrument    Nights    %
   5      5             29      60           ASCAP         89    88.1
   1      2              2      10          CS/2DF         12    11.9
   -      -              -      --                         --    ----
   6      7             31      70                        101   100.0

                          Now         Last Semester    Semester Before Last
No. of Requests            13             19              19
No. of nights requested   101            164             173
Oversubscription         0.57           0.92            1.02
Average request          7.77           8.63             9.1
* 177 nights available



0.9-m Telescope
 # of Requests      # of Nights Requested
 Dark  Bright          Dark    Bright      Instrument    Nights    %
  20     16            112      95          CF/CCD        207   100.0

                          Now         Last Semester    Semester Before Last
No. of Requests            36             41              36
No. of nights requested   207            258             240
Oversubscription         1.21           1.54            1.41
Average request          5.75           6.29            6.66
* 171 nights available



Schmidt Telescope
 # of Requests      # of Nights Requested      Instrument   %
     14                    77                   CF/CCD    74.0
      4                    27                   Plates    26.0
      -                    --                             ----
     18                   104                            100.0

No. of Requests              18
No. of nights requested     104
Oversubscription           0.58
Average request            5.78



0.6-m Telescope
 # of Requests       # of Nights Requested    Instrument    %
      2                     34                  ASCAP    100.0

No. of Requests               2
No. of nights requested      34
Oversubscription           0.19
Average request            17.0

Jay Elias

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