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INGRID Array History

Basic parameters



April 2008                
Gain    4.1-4.3 e-/ADU                        
Readnoise    20-25 e-
Full-well capacity   
Pixel scale    0.04 "/pix
Readout time    0.76s
February 2004                
Gain    3.9-4.1 e-/ADU                        
Readnoise    18-24 e-
Full-well capacity   
Pixel scale    0.04 "/pix
Readout time    0.76s
March 2001-August 2001
Gain    5.3 e-/ADU
Readnoise    26-45 e-
Full-well capacity    22000 ADU
Pixel scale    0.238 "/pix
Readout time    0.864s (timing error corrected)
May 2000-February 2001 
Gain    5.3-6.4 e-/ADU
Readnoise    37-65 e-
Full-well capacity    28000 ADU
Pixel scale    0.242 "/pix (with old foreoptics) 
Readout time    0.896s (timing error corrected)


This section contains darks and hot pixel masks for the INGRID array, which are representative of each period between cool downs or software/electronic changes. The darks and hot pixel masks contained here are not intended to be used by the observers. Each observer should create their own darks during the observing run and generate his/her own pixel mask from the data. This section is intended to record useful data for the INGRID team.
  • date: 16-June-2005 (after warming up in February 05 and cooling down in June 05); INGRID @ GRACE Nasymth
    array temperature: 80.5 K
    readout noise (post-pre): 5.0 adu (~20 electrons)
    number of hot pixels (in 10s): 6550 (0.62%). Per quadrants: 0.31%, 0.32%, 0.93% and 0.93% of the pixels are hot in quadrants left-up, right-up, right-down and left-down respectively
    r752386pp_small.png hpm_r752386pp_small.png
    Dark 10s (r752386pp.fits)
    FITS file (gzipped, 1.0Mb)
    Hot pixel mask
    FITS file (gzipped, 25.8Kb)

  • date: 03-Feb-2005 (monitoring); INGRID @ GRACE Nasymth
    array temperature: 79.0 K
    readout noise (post-pre): 5.5 adu (~22 electrons)
    number of hot pixels (in 10s): 7989 (0.76%). Per quadrants: 0.54%, 0.50%, 1.02% and 0.98% of the pixels are hot in quadrants left-up, right-up, right-down and left-down respectively
    r719899pp_small.png
    Dark 10s (r719899pp.fits)
    FITS file (gzipped, 1.0Mb)
    Hot pixel mask
    FITS file (gzipped, 25.8Kb)

  • date: 27-Mar-2003 (after the accidental (not complete) warm--up of INGRID); INGRID @ Cass, CCC off -- only LN2 but 2 cans
    array temperature: 79.0 K
    readout noise (post-pre): 8 adu (~32 electrons)
    number of hot pixels (in 10s): 7617 (0.73%). Per quadrants: 0.35%, 0.36%, 1.1% and 1.1% of the pixels are hot in quadrants left-up, right-up, right-down and left-down respectively
    Dark 10s (r585921pp.fits)
    FITS file (gzipped, 1.0Mb)
    Hot pixel mask
    FITS file (gzipped, 23.6Kb)

  • date: 6-Feb-2003 (after warming up and cooling down the 30th January 2003, to install the new LN2 can); INGRID @ Cass, CCC off -- only LN2 but 2 cans
    array temperature: 80.2 K
    readout noise (post-pre): 5.2 adu (~21 electrons)
    number of hot pixels (in 9.8s): 8006 (0.76%). Per quadrants: 0.50%, 0.47%, 1.07% and 1.01% of the pixels are hot in quadrants left-up, right-up, right-down and left-down respectively
    Dark 10s (r571365pp.fits)
    FITS file (gzipped, 1.0Mb)
    Hot pixel mask
    FITS file (gzipped, 25.5Kb)

  • date: 17-May-2002 (after cooling down on the 21st March 2002); INGRID @ Ghrill but CCC working
    array temperature: 71.8 K
    readout noise (post-pre): 5.1 adu (~20 electrons)
    number of hot pixels (in 9.8s): 3961 (0.38%). Per quadrants: 0.19%, 0.21%, 0.57%, and 0.54% of the pixels are hot in quadrants left-up, right-up, right-down and left-down respectively
    Dark 9.8s (r494937pp.fits)
    FITS file (gzipped, 1.0Mb)
    Hot pixel mask
    FITS file (gzipped, 17.1Kb)

  • date: 5-Sept-2001 (just after the change to UltraDas)
    array temperature: not recorded
    readout noise (post-pre): 4.9 adu (~19 electrons)
    number of hot pixels (in 10s): 6094 (0.6%). Per quadrants: 0.47%, 0.37%, 0.79% and 0.69% of the pixels are hot in quadrants left-up, right-up, right-down and left-down respectively
    Dark 10s (r445647pp.fits)
    FITS file (gzipped, 1.0Mb)
    Hot pixel mask
    FITS file (gzipped, 21.6Kb)

  • date: 2-May-2001
    array temperature: 71.4 K
    readout noise (post-pre): 5.7 adu (~30 electrons)
    number of hot pixels (in 10.86s): 5014 (0.48%). Per quadrants: 0.63%, 0.67%, 0.31%, and 0.29% of the pixels are hot in quadrants left-up, right-up, right-down and left-down respectively. Note the feature in this dark image of 2-May-2001, which is not always easily seen.

    NB: There is a rotation of 180 deg in the images taken before Ultradas (i.e. before 1st Sept 2002) with respect to the images taken after that date.)
    Dark 10s (r414993pp.fits)
    FITS file (gzipped, 3.0Mb)
    Hot pixel mask
    FITS file (gzipped, 18.1Kb)



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Last modified: 17 June 2012