OSIRIS Filter Reports

Filter Reports

The table below shows the filters installed in OSIRIS. The table is split up into two sections, one for the Spectrometer portion of OSIRIS (SPEC), and one for the Imager portion (IMAG). The Central Wavelength, Bandwidth, Cut-On/Cut-Off Wavelengths, and Transmission data listed in this table are based on the 50% transmission points. All data are for filters at operational temperature (77K).

Combined OSIRIS Filter Plots:

Plots showing relationship of Broad Band to Narrow Band filters:
(Only done for SPEC filters - IMAG filters very similar.)		 SPEC Z-band
SPEC J-band
SPEC H-band
SPEC K-band
All Broad Band filters on the same plot:
(Only done for SPEC filters - IMAG filters very similar.)		 SPEC Broad Bands
All filter plots in single PDF file with all above individual: SPEC Filters
IMAG Filters

IR Atmospheric Absorption Plot

 

SPEC Filters
Filter Wheel
&
Position		 Central
Wavelength
(nm)		 Bandwidth
(nm)		 Cut-On
Wavelength
(nm)		 Cut-Off
Wavelength
(nm)		 Transmission
Average/Peak
(%)		 Datafile
Zbb SFW Pos #1 1089.5 218.8 980.1 1198.9 83.8 / 93.9 txt
Jbb SFW Pos #2 1309.7 260.1 1179.7 1439.8 78.9 / 86.2 txt
Hbb SFW Pos #3 1637.9 329.5 1473.1 1802.6 92.6 / 96.3 txt
Kbb SFW Pos #4 2172.8 415.7 1964.9 2380.7 85.5 / 92.3 txt
Narrow Band
Zn2 SFW Pos #5 1044.5 51.3 1018.9 1070.1 69.8 / 76.3 txt
Zn3 SFW Pos #6 1086.7 52.6 1060.4 1113.0 71.6 / 82.9 txt
Zn4 SFW Pos #7 1130.5 54.6 1103.2 1157.8 77.6 / 84.8 txt
Zn5 SFW Pos #8 1176.2 56.3 1148.0 1204.3 72.8 / 79.7 txt
Jn1 SFW Pos #9 1202.8 58.4 1173.6 1232.0 77.8 / 82.9 txt
Jn2 SFW Pos #10 1258.3 60.8 1227.9 1288.7 78.0 / 86.7 txt
Jn3 SFW Pos #11 1306.9 64.5 1274.7 1339.2 84.2 / 91.3 txt
Jn4 SFW Pos #12 1356.3 65.8 1323.4 1389.2 82.3 / 91.1 txt
Hn1 SFW Pos #13 1503.3 74.7 1466.0 1540.7 80.9 / 84.9 txt
Hn2 SFW Pos #14 1570.8 77.6 1532.0 1609.5 75.2 / 84.3 txt
Hn3 SFW Pos #15 1634.8 81.4 1594.1 1675.5 79.5 / 84.3 txt
Hn4 SFW Pos #16 1694.1 84.9 1651.6 1736.6 83.3 / 90.7 txt
Hn5 SFW Pos #17 1764.4 86.1 1721.4 1807.5 74.8 / 86.5 txt
Kn1 SFW Pos #18 2004.8 100.1 1954.8 2054.9 85.1 / 91.7 txt
Kn2 SFW Pos #19 2088.4 104.5 2036.2 2140.7 83.4 / 94.0 txt
Kn3 SFW Pos #20 2175.4 108.0 2121.3 2229.4 83.8 / 91.4 txt
Kn4 SFW Pos #21 2263.8 112.6 2207.5 2320.1 75.0 / 84.7 txt
Kn5 SFW Pos #22 2349.9 116.5 2291.7 2408.2 79.5 / 90.7 txt


IMAG Filters
Filter Wheel
&
Position		 Central
Wavelength
(nm)		 Bandwidth
(nm)		 Cut-On
Wavelength
(nm)		 Cut-Off
Wavelength
(nm)		 Transmission
Average/Peak
(%)		 Datafile
Zbb IF2 Pos #1 1091.5 220.3 981.4 1201.6 82.1 / 93.0 txt
Jbb IF2 Pos #2 1309.4 259.8 1179.5 1439.4 79.2 / 86.6 txt
Hbb IF2 Pos #3 1638.3 329.2 1473.7 1802.9 92.6 / 96.3 txt
Kbb IF2 Pos #4 2171.7 415.6 1963.9 2379.5 86.9 / 93.9 txt
Narrow Band
Zn3 IF1 Pos #1 1086.8 52.5 1060.6 1113.1 71.5 / 82.9 txt
Jn1 IF1 Pos #2 1202.9 58.5 1173.7 1232.2 77.7 / 82.5 txt
Jn2 IF1 Pos #3 1258.1 60.8 1227.7 1288.5 78.2 / 86.5 txt
Jn3 IF1 Pos #4 1306.0 64.3 1273.8 1338.1 84.6 / 92.1 txt
Hn1 IF1 Pos #5 1503.7 74.7 1466.4 1541.1 80.9 / 85.2 txt
Hn2 IF1 Pos #6 1570.0 77.5 1531.3 1608.8 76.6 / 85.5 txt
Hn3 IF1 Pos #7 1635.1 81.4 1594.4 1675.8 79.5 / 84.3 txt
Hn4 IF1 Pos #8 1695.1 84.9 1652.6 1737.5 82.7 / 91.6 txt
Hn5 IF1 Pos #9 1764.2 86.1 1721.1 1807.2 75.0 / 87.0 txt
Kn1 IF2 Pos #5 2004.4 100.2 1954.3 2054.5 84.7 / 91.1 txt
Kn2 IF2 Pos #6 2090.5 104.7 2038.1 2142.9 83.2 / 93.7 txt
Kn3 IF2 Pos #7 2175.6 108.1 2121.6 2229.7 84.1 / 91.6 txt
Kn4 IF2 Pos #8 2264.8 112.4 2208.6 2321.0 75.1 / 84.8 txt
Kn5 IF2 Pos #9 2349.8 116.4 2291.6 2408.0 79.4 / 90.8 txt
Last modified: 08/19/2011 01:14
Send questions or comments to:OSIRIS Support

The information on this page is the property of the W. M. Keck Observatory. The contents of this page or any part thereof shall not be copied or otherwise reproduced or transferred to other documents or used or disclosed to others for any purpose other than observing support at the W. M. Keck Observatory and the subsequent analysis and publication of scientific data obtained from observations conducted at the W. M. Keck Observatory. All rights reserved. © W. M. Keck Observatory.