2021-07-19, 05:19 PM
Hello Alex,
The Imaging Project exposure table assumes optimum conditions in order to make its calculations. These values are there to give you a general idea of what the total exposure times will be, primarily for the purpose of comparison of the filters. When you schedule a filter in the real world, the SNR that is achieved depends on the conditions at the time: weather (RH, Temp), seeing, twilight, moonlight, and the altitude of the object.
Look at the SNR values in the completed observations table in the Observations tab for your project. Some of these have a quite low SNR. This is due to the conditions at the time. In real life you should never have made these observations, as the Scheduler is there to help ensure that you only get the highest quality results. If you follow the recommendations of the Scheduler, you will achieve your target SNR much more quickly. But in the real world, it is likely always going to take a bit more exposure time than the ideal presented in the Exposure Goals for the Project.
The Imaging Project exposure table assumes optimum conditions in order to make its calculations. These values are there to give you a general idea of what the total exposure times will be, primarily for the purpose of comparison of the filters. When you schedule a filter in the real world, the SNR that is achieved depends on the conditions at the time: weather (RH, Temp), seeing, twilight, moonlight, and the altitude of the object.
Look at the SNR values in the completed observations table in the Observations tab for your project. Some of these have a quite low SNR. This is due to the conditions at the time. In real life you should never have made these observations, as the Scheduler is there to help ensure that you only get the highest quality results. If you follow the recommendations of the Scheduler, you will achieve your target SNR much more quickly. But in the real world, it is likely always going to take a bit more exposure time than the ideal presented in the Exposure Goals for the Project.
Clear skies,
Greg
Head Dude at Skyhound
Greg
Head Dude at Skyhound