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DSLR Photometry - TG magnitude compared to V or label?

swadhwa
Affiliation
Variable Stars South (VSS)
Wed, 07/10/2019 - 12:38

HI

Just starting out with DSLR photometry. I seem to have image acquisition and calibration sorted.

Split the image into RGB channels - using only green at the moment.

Using Iris to perform ensemble photometry. I can generate the instrument magnitudes for the comparison and check stars however I am not sure which published magnitudes I need to use. Do I use the labelled magnitude on the AAVSO charts or do I use the "V" magnitudes from the photometry table. The results are not transformed at this stage. I would like to report "TG" magnitude for the present at least.

Thanks in advance

Serge

HBB
Affiliation
American Association of Variable Star Observers (AAVSO)
Wed, 07/10/2019 - 12:47
TG or V

You would use the V magnitude from the photometry table.

Barbara

 

swadhwa
Affiliation
Variable Stars South (VSS)
Thu, 07/11/2019 - 01:25
Select Johnson V when submitting?

Thanks.

I assume I select Johnson V as the filter on the submission form or ??(unfiltered zeropoint V)

Serge