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Images not being solved

NMR's picture
NMR
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Joined: 2010-08-04

I have has a problem with getting red boxes for WCS when using VPhot with images of BF ORI, T ORI and BM ORI.

Other images taken the same night with the same scope (SierraStars) have been OK so I am rather puzzled. Any ideas?

Martin Nicholson (AAVSO = NMR)

Images not being solved
kge's picture
kge
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Joined: 2010-07-19

Hard to tell, but in general the chance of a successful plate solution depends on both image quality and star field. Since some of your images solved the problem is probably related to the field.

The odds depend on the number of detectable stars in the FOV, the more sparse the field is the less are the odds. A very variable background can also cause problems, such as galaxies, dust clouds or similar.

That said, sometimes PinPoint does not find a solution even when the image quality and star density is good. Don't know why, just seems to be one of those things.

Geir

Astrometry trouble
MOR's picture
MOR
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Joined: 2010-08-07

I've the same trouble with my telescope images. The field is small (12'x12'), but other sofware can solve this image like Astroart / Elbrus with galaxie or without. The pin point sofware is very poor or the choice of stars catalog is not right.

Astrometry trouble
kge's picture
kge
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Joined: 2010-07-19

In your case the problem was not plate solving, but a glitch in the upload software that caused the reference to your telescope setup to be missing. Thus PinPoint could not find the image scale to use.

That uploading problem should now be fixed.

Also, I have reprocessed your images. Almost all of them plate solved, and they are now available in your image list.

Geir

Thank for your help, I will
MOR's picture
MOR
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Joined: 2010-08-07

Thank for your help, I will try for next times.

I had a problem with an image
Gustav Holmberg's picture
Gustav Holmberg
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Joined: 2011-10-29

I had a problem with an image that wasn't plate solved. Solution: upload to http://nova.astrometry.net/

Cheers,

/Gustav

Images not being solved
rmu's picture
rmu
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Joined: 2010-07-23

PinPoint is a powerful tool; plate solving sometimes fail because of the catalogue, when works in poor zones, with narrow field images.

AAVSO 49 Bay State Rd. Cambridge, MA 02138 aavso@aavso.org 617-354-0484