UIST: Engineering: UIST/UFTI Comparison - July 2007

Observations of the same FS standard, FS146, were secured on 2007-07-25, with UFTI (0.09" plate scale), UIST 0.12" and UIST 0.06". The same exposure time, number of coadds and jitter pattern (10sec x 3 coadds x 5pt jitter) were used in each case. The same K98 filter was used. Data were reduced with the same 5-point jitter pattern recipe.

The mosaics are available here:

• UFTI 0.09 - gf20070725_10_mos.sdf -- [GIF]
• UIST 0.06 - gu20070725_20_mos.sdf -- [GIF]
• UIST 0.12 - gu20070725_14_mos.sdf -- [GIF]

Depth and Image Quality Comparison (K-band only)

• FWHM derived from gaussian fits to same four stars in each reduced mosaic.
  
• Z.P. calculated with same 5" aperture, centred on FS146.
  
• Throughput calculated from the zeropoint: ZP = 2.5 log[P*thruput/gain], where P is the photons/second from zeroth mag star, corrected for atmosphere, filter and effective 3.5m diameter of UKIRT (P = 1.35e10 photons/sec at K). Gain for UIST and UFTI are 6.0 and 5.5, respectively.
  
• Background counts: counts on sky per arcsecond (equivalent to throughput provided sky brightness doesn't change).
• 17.0 mag star errors:Faintish source near center of each mosaic - errors given by GAIA Aperture-photometry tool in 2.5 arcsec aperture.

Qualitative comparison

The images below show a comparison of the UIST 0.12" camera and UFTI of the same region (50" NNE of FS146; not covered by the UIST-0.06" camera data).

FS146 as seen by UIST 0.06, 0.12 and UFTI. The central black contour outlines the FWHM.

Telescope Log:

UFTI

Beginning of MSB titled: Calibration
   1    1         CAL 04:13:13        None     DARK   1.00 Blank   0.0/ -0.0  1.00 ARRAY_TESTS           
   2    1         CAL 04:13:24        None     DARK   1.00 Blank   0.0/ -0.0  1.00 ARRAY_TESTS           
   3    1         CAL 04:13:36        None     DARK   1.00 Blank   0.0/ -0.0  1.00 ARRAY_TESTS           
   4    1         CAL 04:13:47        None     DARK   1.00 Blank   0.0/ -0.0  1.00 ARRAY_TESTS           
   5    1         CAL 04:13:59        None     DARK   1.00 Blank   0.0/ -0.0  1.00 ARRAY_TESTS           
   6    1         CAL 04:14:12        None     DARK   5.00 Blank   0.0/ -0.0  1.00 ARRAY_TESTS           
   7    1         CAL 04:14:24        None     DARK   5.00 Blank   0.0/ -0.0  1.00 ARRAY_TESTS           
   8    1         CAL 04:14:37        None     DARK   5.00 Blank   0.0/ -0.0  1.00 ARRAY_TESTS           
   9    1         CAL 04:14:51        None     DARK  60.00 Blank   0.0/ -0.0  1.00 ARRAY_TESTS           
Beginning of MSB titled: UIST/UFTI im-quality check 1b - UFTI
  10   10      U/EC/5 08:09:11       FS146     DARK  30.00 Blank   0.0/  0.0  1.04 REDUCE_DARK           
  11   10      U/EC/5 08:10:28       FS146   OBJECT  30.00   K98   0.0/  0.0  1.07 JITTER_SELF_FLAT      
  12   10      U/EC/5 08:11:16       FS146   OBJECT  30.00   K98  10.0/ 10.0  1.07 JITTER_SELF_FLAT      
  13   10      U/EC/5 08:12:05       FS146   OBJECT  30.00   K98 -10.0/ 10.0  1.07 JITTER_SELF_FLAT      
  14   10      U/EC/5 08:12:53       FS146   OBJECT  30.00   K98 -10.0/-10.0  1.07 JITTER_SELF_FLAT      
  15   10      U/EC/5 08:13:43       FS146   OBJECT  30.00   K98  10.0/-10.0  1.07 JITTER_SELF_FLAT     

UIST

Beginning of MSB titled: Calibration
   1    1         CAL 04:16:02        None     DARK   1.00 black   0.0/ -0.0  1.00 MEASURE_READNOISE     
   2    1         CAL 04:16:05        None     DARK   1.00 black   0.0/ -0.0  1.00 MEASURE_READNOISE     
   3    1         CAL 04:16:08        None     DARK   1.00 black   0.0/ -0.0  1.00 MEASURE_READNOISE     
   4    1         CAL 04:16:11        None     DARK   1.00 black   0.0/ -0.0  1.00 MEASURE_READNOISE     
   5    1         CAL 04:16:14        None     DARK   1.00 black   0.0/ -0.0  1.00 MEASURE_READNOISE     
   6    1         CAL 04:16:18        None     DARK   1.00 black   0.0/ -0.0  1.00 MEASURE_READNOISE     
   7    1         CAL 04:16:21        None     DARK   1.00 black   0.0/ -0.0  1.00 MEASURE_READNOISE     
   8    1         CAL 04:16:24        None     DARK   1.00 black   0.0/ -0.0  1.00 MEASURE_READNOISE     
   9    1         CAL 04:16:27        None     DARK   1.00 black   0.0/ -0.0  1.00 MEASURE_READNOISE     
  10    1         CAL 04:16:30        None     DARK   1.00 black   0.0/ -0.0  1.00 MEASURE_READNOISE     
  11    1         CAL 04:16:33        None     DARK   1.00 black   0.0/ -0.0  1.00 MEASURE_READNOISE     
  12   12         CAL 04:19:57        None     DARK 100.00 black   0.0/ -0.0  1.00 DARK_AND_BPM          
  13   12         CAL 04:21:40        None     DARK 100.00 black   0.0/ -0.0  1.00 DARK_AND_BPM          
Beginning of MSB titled: UIST/UFTI im-quality check 1a - UIST
  14   14      U/EC/5 08:16:24       FS146     DARK  10.00 black   0.0/  0.0  1.07 REDUCE_DARK           
  15   14      U/EC/5 08:19:19       FS146   OBJECT  10.00   K98   0.0/  0.0  1.06 JITTER_SELF_FLAT_APHOT
  16   14      U/EC/5 08:19:55       FS146   OBJECT  10.00   K98 -10.0/ 10.0  1.06 JITTER_SELF_FLAT_APHOT
  17   14      U/EC/5 08:20:32       FS146   OBJECT  10.00   K98 -10.0/-10.0  1.06 JITTER_SELF_FLAT_APHOT
  18   14      U/EC/5 08:21:08       FS146   OBJECT  10.00   K98  10.0/-10.0  1.06 JITTER_SELF_FLAT_APHOT
  19   14      U/EC/5 08:21:43       FS146   OBJECT  10.00   K98  10.0/ 10.0  1.06 JITTER_SELF_FLAT_APHOT
  20   20      U/EC/5 08:23:19   CMC103250     DARK  10.00 black   1.2/ -0.8  1.06 REDUCE_DARK           
  21   20      U/EC/5 08:25:15       FS146   OBJECT  10.00   K98   0.0/  0.0  1.06 JITTER_SELF_FLAT_APHOT
  22   20      U/EC/5 08:25:52       FS146   OBJECT  10.00   K98 -10.0/ 10.0  1.06 JITTER_SELF_FLAT_APHOT
  23   20      U/EC/5 08:26:27       FS146   OBJECT  10.00   K98 -10.0/-10.0  1.06 JITTER_SELF_FLAT_APHOT
  24   20      U/EC/5 08:27:09       FS146   OBJECT  10.00   K98  10.0/-10.0  1.06 JITTER_SELF_FLAT_APHOT
  25   20      U/EC/5 08:27:45       FS146   OBJECT  10.00   K98  10.0/ 10.0  1.06 JITTER_SELF_FLAT_APHOT