ASTAP 0.9.114 as plate solver

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han.k
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Joined: 23 Nov 2017, 15:04
Location: The Netherlands
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ASTAP 0.9.114 as plate solver

Post by han.k » 21 Sep 2018, 15:17

The plate solver in ASTAP version 0.9.114 just released can do blind plate solving. Om my system is achieves a full sky scan in about 380 seconds. This means that blind solving should in most case have result in half of the time is190 seconds of better depending on the offset. Not bad for a brute force method, single processor program.

For this the search spiral was adapted for the sky sphere. Secondly the dept of the star database reading is adapted to match the number of stars in the image.

Note that the internal plate solver works best with raw unstretched and sharp images of sufficient resolution where stars can be very faint. Heavily stretched, very long exposures or photo shopped images are problematic. It requires minimum about 30 stars. Images containing of a few hunderd stars are ideal. For star rich images the detection limit is adapted to limit the number of stars detected.This will only work for unstretched images. In the latest version also binning prior to solving is available for large images above 3000 pixels wide. This will also improve signal to noise ratio. For very problematic images Astrometry.net will do a better job.


The plate solver work fine with CCDCIEL and can work as a PlateSolve2 substitute in APT.

The development is ongoing. Please report any problem.

Clear skies, Han
astap_performance.png
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han.k
Posts: 123
Joined: 23 Nov 2017, 15:04
Location: The Netherlands
Contact:

ASTAP 0.9.116 as plate solver

Post by han.k » 25 Sep 2018, 16:25

I did several plate solving (or better astrometric solving) tests on public images available in Astrometry.net (http://nova.astrometry.net/explore) and ironed out some problems and released it as v0.9.116

ASTAP requires preferable raw images unstreched up to magnitude 17 (with G17) or 18 with the G18 database. Above 3000 pixels wide binning option should be used.

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