Changes

We now collect automated biases and flats at the start of the night that we collate into monthly master files for users. The files can be obtained [https://io.saao.ac.za/IO/mookodi/master_files/ here]. At that link you can also find a basic reduction python script that can be used to reduce the science files using the appropriate master bias/flat file.

*In the case of biases, "slow" and "fast" refers to the readout mode and for your science files that can be checked by looking at the "HSHIFT" keyword in the header: slow=0.05 and fast=5.0*Mookodi's derotator cable-wrap does not have a full 360 degree range so the result is that some observations are taken with north up in the images while others flipped 180 degrees with north down in the images. It is roughly correlated to which side of the meridan your observations took place. Your science images can be a mix if a derotation occured during your observation sequence. There is are also subtle changes in the telescope throughput for the two orientations so you need to use flats taken at the same orieantion orientation as your science images. The supplied reduction script will warn you if you are using flats at a different orientation than your science frames(but still reduce the files). If you are reducing the data yourself with your own software, you can check which orieantion orientation your scince science image was taken at by using the value of the ROTANGLE and ROTSKYPA header keywords. The sky-angle is = ROTANGLE-ROTSKYPA. If the sky-angle is close to 0, 360 or -360 your images are with north '''DOWN'''. If the sky-angle is close to 180 or -180 your images are with north '''UP'''.