Transform Coeff

Hi All,

Couple questions, How do I know my transform coeff are good (See below)? This is my first time taking any photometric measurements, Should I continue to try and generate coefficients? Seems like things such as SNR, light pollution, moon glow, and air mass would affect the accuracy of the coefficients? Is there a way to improve? These coefficients were generated in Tycho Tracker:

Tbv= 0.968
Tb_bv= -0.091
Tv_bv= -0.058
[Error]
Tbv= 0.013
Tb_bv= 0.029
Tv_bv= 0.026
[R Squared Values]
Tbv= 0.990
Tb_bv= 0.454
Tv_bv= 0.964

Update: I only have 7 B-V measurements over 100 SNR, I used above 50 SNR threshold, is that ok?

As with any experimental science, you should run your analysis multiple times with additional sets of images (e.g., 3 nights) and compare your results. You should get a consistent result for your coefficients. Hopefully with a random error (precision) of just a few percent.

Additionally, you could then use these coefficients to analyze known standard comp stars (e.g., Landolt comp stars) as targets and see if you get the expected known magnitude after transformation. IOW, are your calculated coeffs accurate as well as precise?

Make sense?

Ken