› Forums › Exoplanets › Beginner seeking advice on selecting exoplanets for detection (transit) › Reply To: Beginner seeking advice on selecting exoplanets for detection (transit)

Right so I was woken at 3am by the youngest sprog and couldn’t get back to sleep, so I did a load of internet searching and reading around SNR, AstroImageJ and aperture photometry (totally normal behaviour, right?).
Stumbled across this useful looking calculator…
https://mirametrics.com/sn_calculator_mvn.php
Plugging in the pertinent data, or estimates of, and it thinks using a 102mm refractor operating with 2 minute exposures, and assuming my minimum acceptable SNR to be 500, then it looks like I should be aiming for stars of at least mag 12.5 with a 2% transit depth.
Edit: Plugging in numbers for my 300mm/1500mm Newtonian says it should be good down to mag 14 ish with a 2% depth.
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This reply was modified 3 weeks, 3 days ago by
Craig Towell.
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This reply was modified 3 weeks, 3 days ago by
Craig Towell.