The ESO Exposure Time Calculator
The ESO Exposure Time Calculator
Henri M. J. BOFFIN
ETC Project manager: ETC Software engineers:
Jakob Vinther
Lars Lundin, David Huerta (former: Gurvan Bazin)
Time is precious
03/03/2021
Henri M. J. BOFFIN
2
Signal-to-noise
t ~ 1111 s
t ~ 11 s
t = 1 s
03/03/2021
Henri M. J. BOFFIN
3
What is an ETC?
? Predict exposure time to get required quality (S/N)
? Phase 1 - call-for-proposals (NOW!)
? Phase 2 - planning obs. details (making OBs)
? Astron. community / ESO ? before, during, after observations ? instrument studies, development, commissioning
? Doesn't include overheads!
03/03/2021
Henri M. J. BOFFIN
4
Signal
03/03/2021
Radius: large enough to encompass all flux, but not too big to reduce noise.
PSF
Non-AO: Gaussian with FWHM ~ seeing
Source: Michael Bolte (UCOLICK)
Henri M. J. BOFFIN
5
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