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Kmag | itime (sec) Seeing~0.6" | itime (sec) Seeing~0.8" | itime (sec) Seeing~1" | itime (sec) Seeing~1.2" | itime (sec) Seeing~1.6" | itime (sec) Seeing~2.0" |
|---|---|---|---|---|---|---|
4 | <10 | <15 | <20 | <25 | < 30 | 30 |
5 | 15 | 30 | 30 | 45 | 45 | 60 |
6 | 30 | 45 | 60 | 60 | 90 | 120 |
7 | 60 | 90 | 120 | 160 | 180 | 200 |
8 | 90 | 120 | 180 | 220 | 260 | 300 |
9 | 180 | 300 | 300 | 480 | 600 | 600 |
10 | 300 | 480 | 600 | 600 | 900 | 900 |
11 | 600 | 900 | 1200 | infinity | infinity | infinity |
12 | 900 | 1200 | infinity | infinity | infinity | infinity |
>13 | 1200 | infinity | infinity | infinity | infinity | infinity |
SNR Estimation Equation
Where itime is the integration time per exposure in seconds, expnum is the number of exposures (must >=multiples of 4, 1x ABBA), Kmag is the K magnitude of the target, and seeing is in arcseconds.
For example, four 600s 300s exposures on a K=10 6.7 target with 01.6" seeing will give you:
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