Angle Tracker (KAT) Limits

V2 modes:

J-band, 80 Hz: 5.0 < J < 10.5
H-band, 80 Hz: 5.0 < H < 10.5 (K-band fringe tracking only)
high spectral dispersion mode (ASTRA-SPR): H-band, 80 Hz: 5.0 < H < 9.0
For binaries in which both components are in the angle tracker FOV, a single component can be selected and sent to the fringe tracker if the separation is greater than ~0.1 arcsec. This mode may result in decreased observing efficiency.
Dual Field Phase Referenced mode (ASTRA-DFPR): H < 13.

Nulling mode:

H < 4.3 mag (80 Hz)
J < 7.5 mag (80 Hz)

40 Hz tracking also available: 1 magnitude fainter limits.
Split-pupil modes: 1 mag brighter limits.
For bright sources, a neutral density filter can be used to shift the range by up to 4.2 mag.
The FOV is 0.5 arcsec with a plate scale of 31 milliarcsec/pixel.

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