-
Suggested starting exposure times in K-band mode for an H-magnitude=5 is 45 seconds when observing with a coronagraph.
-
When Observing in High Resolution K-band mode request the AO188 operator to remove the ADC.
The zero-point of each channel in K-band mode is given below, the max zero-point is K = 13.5 mag.
![K Zero Point](/sites/g/files/toruqf4741/files/styles/freeform_750w/public/charis/files/1u2vjcaaaaasuvork5cyii.png?itok=vKX9mqOF)
The curve below shows the 2-read saturation limit with no coronagraph. The maximum allowable magnitude to avoid saturation is K = 5.5 mag.
![2 Read Saturation Limit, Unocculted K](/sites/g/files/toruqf4741/files/styles/freeform_750w/public/charis/files/unoccultedksat.png?itok=pe_SgGKw)
NOTE: Throughput of SCExAO rebuild and AO performance on any particular night will affect these numbers. Strehl ratios of 60-80% were estimated when this data was taken