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DIS III Spectra Information

DIS-III Spectra & Other information

This page last updated: May 20, 2004 - JMD
This page last checked: April 5, 2004 - JMD
Contact Jack Dembicky for web page errors, corrections, ommisions, and/or additions.


LOW Red LOW Blue MED Red MED Blue HIGH Red HIGH Blue
Central Wave 8000е 4224е 7500е 4000е 8465е 5000е
Wave Range (based on 2000 pixels) 10060е 4860е 4520е 2460е 1680е 1240е
Blaze Angle 3.43° 3.63° 6.53° 6.90° 20.57° 17.45°
Lines / mm 150 300 300 600 830.8 1200
Steps / pixel -0.17 +0.15 -0.17 +0.15 -0.17 +0.15
Linear Dispersion w/ Current Optics 5.03е /pix 2.43е /pix 2.26е /pix 1.23е /pix 0.84е /pix 0.62е /pix
Linear Dispersion w/ Old Optics 7.0 е /pix 3.05е /pix 3.15е /pix 1.6 е /pix 1.17е /pix 0.80 е /pix

Spacial scale for Red gratings are : 0.40 arc-sec/pixel
Spacial scale for Blue gratings are: 0.42 arc-sec/pixel

Offset Directions for DIS Using Various Interfaces as viewed by the Slit Camera
(Object Rotation=0.0, Using IRAF or Slit Camera Display)