How+to+determine+magnitude+of+an+object

To determine the magnitude of both reference objects and suspect objects (Supernova) follow the procedure below:-

On the top tool bar click 'Analyze' and then 'Photometry'. Two windows will appear.

Ensure that the Information window has the 'Mode' selected as 'Apertue'.

Next, a reference Star needs to be selected to 'calibrate' the image against a 'Star of known magnitude. Select a reference star that is relatively close to the suspect object.

Use [] to determine the magnitude of the reference star. Hover the mouse of the reference star selected in []. The magnitude (along with position data) will be displayed. Note down the magnitude of the reference star/stars.

On the left hand window in MaxImDl change the @Mouse click tags' selection box to 'New reference star'. Select the reference star inthe image.

Enter the reference stars magnitude in the 'Ref Mag' box in thePhotometry window and the Information window. Click 'Apply in the Information window.

Annulus size?? Annulus thickness?? Gap width?? Apeture increase/decrease??