1. Home
  2. Forums
  3. About the AAVSO
  4. General AAVSO Discussion

Interpretation of a Light Curve chart.

Announcement: New Forums

We are excited to announce the launch of our new forums! You can access it forums.aavso.org. For questions, please see our blog post. The forums at aavso.org/forum have become read-only.

MHC
Affiliation
None
Sat, 09/05/2020 - 16:11

Friends,

I would like to know the meaning of the letters TB, TG, TR in a light curve chart. I can infer the meaning of the other letters: Vis (observation with the naked eyes or through binoculars or telescope, no filters), Faint (magnitud less than the faintest comparison star), B (using blue filter), V (using green filter), R  (using blue filter), I (using infrared filter). Would you tell me if I am right or wrong? What are the measurements with photometry, with a CCD or a DSLR?

Thank You.

Celso Montalvo.

WGR
Affiliation
American Association of Variable Star Observers (AAVSO)
Sat, 09/05/2020 - 16:16
Light Curve Chart

Hello Celso

The TB, TG, TR are for DSLR photometry using the cameras bayer pattern.  BVRI are for Johnson-Cousins Photometric Filters (most popular for variable star science), Vis is for visual naked eye estimates.  CCD is usually done with BVRI--or Sloan filtrs which are similar but not the same as BVRI.  Sloan are usually designated with lower case and a prime--ie g' for example.