BAA Winchester Weekend - Step 2 - FoCAs
In Step 2 we are going to use FoCAs to create multibox magnitude measurements of 70P using six different measuring “boxes” of 10 x 10, 20 x 20, 30 x 30, 40 x 40, 50 x 50 and 60 x 60 seconds of arc.  Luckily FoCAs does most of the hard work and is available for free from the Cometas website, so if you don’t have it already, download it from the following link: http://www.astrosurf.com/orodeno/focas/ When you set up the software there’s an option to select English as the default language and the help files are very good so do spend some time reviewing these and downloading the relevant comet data files (again for free). Once you use the software regularly, on launch you will receive a message as shown below (the first time you use the software this shouldn’t happen): Just click on “View/Delete” for both of these and delete the prior data and then you’ll be ready to proceed. In the “Process” tab, click on each of the following buttons in turn:  - Images  - Select valid images  - Process This will then take the data that you produced in Astrometrica in Step 1 and display the following screen: In the image above you will see that I have already selected three measurements (highlighted in blue) and you should do the same, then click “Save Report” and close FoCAs. That’s all you need to do in Stage two, but if you want to see what FoCAs has produced look at the following files in your FoCAs directory:  - _multi.txt  - _mpc.txt (In my case the FoCAs directory is at C:\Users\Kevin\AppData\Local\Focas, but it may be different in your case depending on where you installed FoCAs).  In the images below I have attached the files that result from my processing, the first contains the multi-box measurements that we’ll use later for submission to Cometas and the second contains the data that will go to the Minor Planet Center (MPC). That’s the end of Step 2.
Hills Observatory: 1 January 2013 to 8 October 2018
COMETS COMETS
DEEP SKY DEEP SKY