Information for the ODI User / ODI Overview

ODI in a Nutshell


Telescope WIYN 3.5m
Telescope Port Permanently mounted at f/6.3 Nasmyth port


Field of View 1° x 1° square; 1° diameter circle unvignetted; partially filled
Pixel Scale 0.11 arsec/pixel
Detectors (partial focal plane) 13 Orthogonal Transfer Array CCDs. Each OTA CCD comprises 64 480x496 pixel cells; pixels are 12μ square
Readout Noise Approx. 8 electrons
Gaps between detector cells 3" in x direction
1.2" in y direction
Filling factor of each OTA 93%
Filling factor of focal plane 84% (for full focal plane with all operating cells)

Partially filled focal plate of ODI with the location of 13 OTAs depicted
QE curve of the OTA CCDs


Initial Filter Set g',r',i',z' (full size)
Filters from NOAO CCD Mosaic Imagers (in adapter)
Filters size 42cm, 42cm
Number of filter slots 9


Readout Time 30 seconds


File Size (full focal plane) 2GB/image uncompressed
(partial focal plane) 200MB/image uncompressed
File Format Each focal plane readout produces a directory in which data from each OTA is contained in a 64-extension MEF file.


Active image quality improvement On-chip image motion correction
Atmospheric dispersion compensator
Focus system Automatic focusing with focus sensor
Guide Modes Static Imaging - no OT shifting; detectors are operated like CCDs
Coherent Guiding - Identical OT shifting of all cells
Local Guiding - focal plane is divided into <256 regions, which are OT shifted independently


All ODI data will be transferred to the ODI PPA system at Indiana University. It will be pipeline processed to remove instrumental signature, and archived. Raw and reduced data may be downloaded from the archive by PI's and Co-I's during the proprietary period and by anyone after the period ends.
Proprietary period 18 months (default)

Last modified: 03-Apr-2014 11:57:10 MST