OBSERVING STATISTICS


Observing statistics for the Next Semester (1995I)

The first semester of 1995 (95I) covers a total of 181 nights. During 95I the telescope is scheduled for scientific use on 156 nights (86.2%) and for engineering 25 nights (13.8%), including a major engineering shutdown of 14 nights in July. These compare with 167.5 scientific nights (93%) and 13.5 engineering nights (7%) in 94II. During the 146 scientific nights for visitors, 49 programs are scheduled. The table below shows the distribution of these programs and the allotted nights between various instruments and configurations. Within the 6 month interval there will be 7 upper end changes.

 VISITOR      Programs      Nights
 
 INSTRUMENTS 
 ARGUS          1                 3
 
 BEAR           2                 7
 
 CIRCUS         1                 4
 
 ISIS           1                 5
 
 LAPOUNE        2                 6
 
 MOCAM          4                11
 
 QUIRC          2                 4
 
 TIGER          2                 5
 
 UH8Kmosaic     3                 7
 
 UHAO           1                 3
 
                                                                     
Visitor 
inst.total     19                55 
 

 CFHT         Programs        Nights
 
 INSTRUMENTS 
 CoudeF/8.2     1                 4
 
 GECKO          1                 6
 
 MOS           17                55
 
 MOSFP          2                 5
 
 SIS            6                11
 
 SISFP          3                10
 
                                                       
CFHT 
instr.total    30                91
 

SCIENTIFIC 
total          49               146
 

Visitor instrument use represents 38% of all scientific observing.

The average number of nights per visitor program is 2.98.


Figure 23: MOCAM image of NGC 628 in V; the field of view is 14x14 arcmin with a sampling of 0.2 arcsec/pixel. The gap size between the 4 2Kx2K Loral CCDs is 3" horizontally and 7" vertically. Star field images showed that the image quality is excellent on the entire mosaic through the 3 filters (V, R and I). The readout noise is lower than 7 e- but these figures are for the engineering grade CCDs. The successful first observing run produced a huge amount of data on weak lensing in intermediate redshift galaxy clusters (z=0.15 to 0.5), a kind of program MOCAM is particularly well suited for. This collaboration between the Observatoire de Toulouse, the Dominion Astrophysical Observatory, the University of Hawaii and the CFHT is a success and a thin mosaic is being planned. It should be available toward the end of 1995. The new thick MOCAM with science grade CCDs will be available to the CFHT scientific community for the semester 95I.


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