Proposal Submission Form

Telescope Schedule

Telescope Operations Manual

Remote Observing

Extended Pointing Map

LIGHTNING SHUTDOWN

Safety

Weather Links

WIYN Imager Logsheet

Queue Observing

Processing and Analysis

S2KB CCD Information

• Technical Specifications

Date: 4/10/97 
CCD NAME : S2KB 
CCD SN : 1383BR03-01 
PIXEL SIZE : 21x21 microns
PIXEL SCALE : 0.60 arcsec/pixel
CHIP SIZE : 2048 x 2048 
DIGITAL LIMITATION : 65,534 
BIAS LEVEL : ~650 (gain=#4)    
MICROCODE : "S2KB" 
PREFLASH, e- : none
DWELL TIME, microsec : 2 3 5 8 15
NOISE, e-/RMS : ? ? 20 14-15 9-10
GAIN, e-/ADU : 9.8 6.5 3.9 2.5 1.3  
GAIN, DETPARS#: 1 2 3 4 5 
LINEARITY,0.1%,e-: ~210,000 
LINEARITY,1.0%,e-: ~230,000   
COLUMN SPILLOVER, e- : ~240,000 
INTERNAL RADIATION EVENT RATE, EVENTS/HR : ~2700    
CONTROL TEMP. deg C (thermocouple) : ~-107 
COMPUTER TEMP. deg C (ccdinfo) :    ~-99 
DARK CURRENT, e-/hr/pix : ~5-10 
DEAD COLUMNS : 
HOT COLUMNS : [1571:1571,1134:2048] bias 
                               : [2066:2066,1:2048] in overscan region, see comment below
LOW COLUMNS : [1103:1103,744:2048] flat field

• The quantum efficiency of S2KB is given in this figure. The abscissa is wavelength in nanometers and the ordinate is dQE (%).



• Here are examples of the original calibration frames for S2KB. Click on the link to display the (BIG) image.

• Bias Frame

• B dome flat

• V dome flat

• R dome flat

• I dome flat

• H-alpha dome flat

• There is a hot column in the overscan region, [2066:2066,1:2048]. Check for the presence and position of this column in your data. You will probably NOT want to use the default BIASSEC in CCDPROC, but rather set BIASSEC to [2053:2064,1:2048] or a similar region of your choosing.
• More recently, S2KB has developed an enhanced bias level in one corner amounting to a peak of ~1500 ADU above an overall level of ~965 ADU. Here is a bias exposure which shows this effect. The enhancement is limited to the region X < ~240 pix and Y> ~1800 pix.
• You can estimate exposure times for S2KB using the CCDTIME package in IRAF v2.11.3 which should still have the necessary information in its ccdtime$kpno.dat database file. If it does not, here is the kpno.dat file.

Telephone: (520) 318-8460
Fax: (520) 318-8417