DSLR images fail for plate solving

Technology VPhot
1

I always get the following error if I upload DSLR image to VPhot:
The image field is so big that we reached the limit of stars from the Guide Star Catalog.
When I cut a piece of the image and upload, I get instead:
Failed to solve plate, possibly due to input plate scale being too far off.

Any idea?

2

Did you try to solve with nova.astrometry.net?
VPhot requires coordinates of the image center for further reduction.

3

Matthias,
Please try plate-solving your DSLR images with Astap. This is very efficient and rapid. Far more than any other way that I have ever tried.
It even works with (reasonnably) defocused images.

Christophe

4

Thanks for your comments, but I did not explain my problem well:
I can plate solve my images with different sofware but I want to evaluate in VPhot and this is to my knowledge not possible if the images have not been platesolved in VPhot during the upload porcess (?). Ans as this doesn’t work I cannot run the photometry.

5

I use following steps:

  1. I get image without coordinates.
  2. Solve the image with nova.astromerty.net.
  3. Save new FITS from nova.astromerty.net.
  4. Upload solved FITS as first step, add filter andget all green fields.
  5. Press NEXT.
  6. Upload image AGAIN (or even set of unsolved images).
  7. Press NEXT.
  8. Now image is placed in VPhot queue and will be processed.

image
image569×210 8.96 KB

I guess, you do not make step 6, right?

OM

6

OM, thanks for the procedure which I think is the wizzard, right? I do not use the wizzard but the quick upload which is the same just on one page. Anyhow, I tried again with the wizzard but the result is (as expected) the same: The image is uploaded but shows a red mark under WCS which means that plate solving did not work. The error message is also the same as described below. And if WCS is red I cannot select comp and variable stars, that is my problem.

7
  • Have you looked under the hood?
  • Yes, I did.
  • Kicked the tire?
  • Yes.
  • Well, then I don’t know.

:flushed_face: