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Acquisition Camera Filters
The Acquisition Camera contains two filter wheels whose details are summarised here. Although similar to the standard UBVRI filters, some photometric differences might be expected and users are cautioned for those programs that depend on direct comparison with previous observations. We are establishing empirical transformations between the Acquisition Camera instrumental magnitudes and the Johnson-Kron-Cousins system as part of the calibration process (details to follow).
The wavelength interval given in the tables in the interval within which the transmission is larger than 50%. If transmission graphs or data are available, click on the "data" or "plot" label in the tables below to retrieve them. The sky brightness in these filters as a function of lunar phase is given as part of a description of observing condition constraints.
|Gemini filter Number||Filter name||Wavelength
|G0103||V_G0103||495 - 625||data, plot||AcqCam-N|
|G0104||R_G0104||605 - 750||data, plot||AcqCam-N|
|G0105||I_G0105||725 - 1000+||data, plot||AcqCam-N|
|G0151||U_G0151||355 - 395||data, plot||AcqCam-S||(1)|
|G0152||B_G0152||370 - 480||data, plot||AcqCam-S|
|G0153||V_G0153||495 - 630||data, plot||AcqCam-S|
|G0154||R_G0154||610 - 750||data, plot||AcqCam-S|
|G0155||I_G0155||720 - 1040||data, plot||AcqCam-S|
Neutral density Filters
|Gemini filter number||Filter name||Average Transmission||Transmission Curve||Instrument||Notes|
Notes to the table:
(1) Optical path difference (OPD) compensation for the U-band filter is to be determined. The neutral density filters cannot be used with the U filter because they have no transmission within the U passband.
(2) These neutral density filters are yet to be delivered.
Last update February 16, 2002; Cláudia Winge
In original form February 28, 2001; Phil Puxley