I'm generating light curves for some variable stars on the AAVSO website (see https://www.aavso.org/lcg ) . I can choose what type of data must be plotted. Can you explain what they are?

The parameters.

Thank you in advance!

  • 3
    $\begingroup$ I was going to suggest "reading the manual", but I can't find one either! Would it have killed them to put a short description of the terms on dropdowns or pop-up boxes? $\endgroup$
    – ProfRob
    Commented Jan 22, 2020 at 8:48
  • $\begingroup$ There is a manual but there isn't a parameters explanation. $\endgroup$ Commented Jan 22, 2020 at 9:24

1 Answer 1


The file format for submitting observations to AAVSO sheds some light on this.

"Visual" data are estimates by visual comparison to nearby reference stars of similar brightness.

U, B, V, R, I data come from CCD cameras using standard filters in the Johnson-Cousins photometric system, with passbands ranging from near ultraviolet to near infrared. The J and H filters pass longer wavelengths in the infrared.

"Unfiltered w/(V|R) zero pt" are also from CCD cameras, not using one of the above filters, and calibrated using published V- or R-band magnitudes of reference stars.

Tri-R, Tri-G, Tri-B refer to the RGB channels of a color (e.g. consumer DSLR) camera.


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