H Sensitivity

Suggested starting exposure times in H-band mode for an H-magnitude=5 is 45 seconds when observing with a coronagraph.


The zero-point of each channel in H-band mode is given below, the max zero-point is J = 17.4 mag.

Zero Point H

The curve below shows the 2-read saturation limit with no coronagraph. The maximum allowable magnitude to avoid saturation is J = 6.8 mag

2 read saturation, H, no coronagraph

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