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Filter change overheads (sec) |
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z |
J |
H |
Ks |
z |
0 |
18 |
63 |
47 |
J |
80 |
0 |
58 |
43 |
H |
34 |
39 |
0 |
68 |
Ks |
54 |
54 |
55 |
0 |
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average: ~50 seconds |
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Changing imaging and spectroscopic modes (sec) |
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image (J) |
spec (zj) |
spec (hk) |
image (J) |
0 |
78 |
45 |
spec (zj) |
43 |
0 |
69 |
spec (hk) |
78 |
56 |
0 |
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average: ~60 seconds
representative for other filters as well.
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Changing imaging, polarimetric and coronographic modes (sec) |
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limage j |
lipol j |
lcor j |
limage j |
0 |
71 |
79 |
lipol j |
45 |
0 |
53 |
lcor j |
47 |
74 |
0 |
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average: ~60 seconds
representative for other filters as well
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On-target Movement overheads: |
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12" dithering offset (imaging, tracking): |
8 |
24" dithering offset (imaging, tracking): |
11 |
12" nodding offset (spectroscopy, tracking): |
12 |
12" nodding offset (spectroscopy, guiding): |
33 |
Rotator angle from 0 to 90 or 90 to 0 degrees: |
120 |
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Exposure related overheads: |
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clear-reads (default N=3. Only before first exposure at each new position.) |
Nx0.8 |
Imaging read-out time, mndr 1 1 (default): |
2 |
 mndr 2 1: |
3 |
Spectroscopy read-out time, mndr 4 1 (default): |
5 |
mndr 8 1: |
11 |
Time until image is displayed after readout: |
4 |
Time until image is saved after readout: |
4 |
Time until you get the prompt back after readout: |
2 |
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Please note that while dithering or nodding, after the last exposure is taken at a given position, the chip is readout while moving to the next position, so only the larger overhead (movement or readout) applies.
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