There was only one data point in VSX for BX Leo so I decided to observe the variable. In one hour of observation, the magnitude range was from 11.612 to 11.532 or brightening of about 0.08 magnitude (Light curve).
The average magnitude for the target throughout the observing period was 11.577 +/- 0.023, check star 1 mag 11.416 +/- 0.016, check star 2 mag 11.307 +/- 0.014. The target's std dev is greater than checks 1 and 2. Also, when the data points are plotted, the linear regression line for BX Leo has a slope of -2.064 and R2 of 0.742, while check 1 has slope of 0.519 and R2 of 0.104, and check 2 has a slope of 0.693 and R2 of 0.229. This would suggest that BX Leo was exhibiting brightening (negative slope) compared to the 2 check stars.
The total exposure integration/stack time for each image is more than the data point interval (midpoint-to-midpoint) to hopefully have the same effect as a moving average (a "moving stack") to have a smoother section of the light curve - for comparing linear regression slope with the check stars. I think this seemed to work fine for this observation.
As noted in VSX, BX Leo is an RR Lyr type star (RRC) with a period of about 9 hours. If you watched it for most of the night, you would observe much of the light curve (LC) and observe a sinusoidal LC with a full amplitude of a few tenths mag.
BTW, this and similar discussions are probably not appropriate for the VSX forum unless you were attempting to gather data to update the VSX information for this target.
Getting pointers on your photometry procedure might be best in the Photometry Forum or, in this case, SPP forum?
I posted on…
I posted on the VSX forum since I was using the VSX as resource to check my observations - but you are right. The observation threads would be best on the photometry and SPP forums.