Quad database downloads
The pre-built quad database files have been split into multiple different sets, so that users can download what they need and there's not necessarily a need to download the full database.
See: https://github.com/Jusas/WatneyAstrometry/releases/tag/watneyqdb3
The sets available are (database version 3, Watney v1.1 and above):
| Name |
Recommended field radius | Size | Description |
|---|---|---|---|
| watneyqdb-00-07-20-v3.zip | >= 0.8 deg | 440 MB | Passes 0-7 (built using 20, 28, 40, 57, 80, 113, 160, 226 stars per square degree) |
| watneyqdb-08-09-20-v3.zip | 0.7 .. 0.6 deg | 464 MB | Passes 8-9 (built using 320, 453 stars per square degree) |
| watneyqdb-10-11-20-v3.zip | 0.5 .. 0.4 deg | 930 MB | Passes 10-11 (built using 640, 905 stars per square degree) |
| watneyqdb-12-13-20-v3.zip | 0.3 deg | 1.8 GB | Passes 12-13 (built using 1280, 1810 stars per square degree) |
| watneyqdb-14-20-v3.zip | 0.2 deg | 1.5 GB | Pass 14 (built using 2560 stars per square degree) |
Note: these values were selected on the base assumption of using 300 stars to solve the image.
What's field radius?
Still confused? The Astronomy tools calculator is useful for this if you don't know the field radius of your telescope and camera setup, but know your telescope dimensions and what camera you've got.
Examples:
- Aperture 70mm, focal length 336mm telescope with ASI1600 camera: 1.9 deg field radius (see
https://astronomy.tools/calculators/field_of_view/)
Sqrt(3.02^2 + 2.28^2) * 0.5 =~ 1.9- ➔ Passes 0-7
- Celestron C9.25 aperture 235mm, focal length 2350mm, 0.63x reducer with ASI1600 camera: 0.43 deg field radius
- ➔ Passes 10-11 (but I would also download 0-7 and 8-9, if my images often have less than 300 stars available for the solver)