VPhot-crash when trying to transform a file with more data (approximately >600 lines)

Technology VPhot
1

Hi,

I must transform a long series of frames with shorter exposures (20 seconds) in B and V band. The resulting file contains approximately ~ 1000 lines. I have noticed that if it exceeds about 600 lines, TransformApplier fails. Either it does not give any result in the window where the transformed data is expected to be obtained, or it returns an error from the server that the resource is no longer available.

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I understand the file contains more lines, but I do not think 1000 records should be difficult for a moderate server. I tried to “split” the data into two files of 600 lines each and then both files passed successfully. However, this takes a lot of time, requires manual modification and there are many risks of human error.

Can something be done regarding the volume of the files for transformation? Approximately 1000 records should not be a challenge. This is a normal series of frames obtained in 1 night.

Thanks in advance,
Nikola

2

VPhot should not be crashing, but I might suggest you look at a standalone app for doing the analysis. There are many available and they are quite good.

I would think uploading 1000 images would take a lot of time (not to mention server resources). That wouldn’t be an issue if you processed them locally.

I used to use VPhot but when I started doing more time series, the wait time for uploads became too frustrating.

3

Hi,

Agree with you. I don’t use VPHot for photometry, only for transformation (TransformApplier). Here is my workflow:

  1. I do photometry in AstroimageJ.
  2. Export the data in VPHot format (each filter data is in separate file).
  3. Merge the data from both filters into one AAVSO VPhot file.
  4. Perform a transformation in TransformApplier.

It works fine if the file with B and V data contains no more than about 600 rows. If the rows are more, the transform crashes.