Mon, 11/27/2023 - 10:37
Hello,
i have a cmos colour camera and i do some photometry on variable stars. So my method is to extract green layer from images with AIP or Siril. Someone told me before that this kind of measurement is near a measurement with a TG filter so i upload my data with TG filter in the files. But which magnitude have i to use: the one given in VSP (for example if i choose the star 100, i use 10.0 as the comp magnitude or may i use the value of V magnitude given in VSP too or may i use the G magnitude given by simbad catalog? What is the good choice? By now, i use the G magnitude given by Simbad catalog for the comp and the check star.
Regards,
Hugues
100 is the comparison star label, always use the value in the photometry table.
Do not use G magnitudes in SIMBAD, they are not "green", they are the Gaia G magnitude and it is similar to the Sloan r-band.
Cheers,
Sebastian