New Year, New FITS
This change relates only to the WCS approximation stored in our FITS files; the astrometric solution accessible with our native pipeline products remains the same. For more context see our previous announcement
Data Preview 1 FITS files have been regenerated with better astrometric approximations. These new approximations are good to (or better than) 3 milliarcseconds in all cases.
As of the most recent Patch Thursday (2026-01-08), you will get these new and improved files when using our API (VO) image services (ObsTAP, SIA, SODA).
With the Butler
When using the Butler, you will also get the new files by default. If you have a need to retrieve the previous (and inferior) versions you can do so by specifying the collection LSSTComCam/DP1/v1. More explicitly:
| Code for constructing a Butler | Result |
|---|---|
butler = Butler("dp1", collections="LSSTComCam/DP1") |
new |
butler = Butler("dp1", collections="LSSTComCam/DP1/v1") |
old |
butler = Butler("dp1", collections="LSSTComCam/DP1/v2") |
new |
Note that the new files have been assigned new dataset UUIDs. If your code was explicitly asking for a specific UUID (e.g. Butler.get_dataset("e6bd297d-0bd0-4d7c-98b7-92b98e086829")) you will get exactly what you were getting before. Perform the appropriate Butler search to get the new UUIDs.
WebDAV upload limit raised
The size limit for files uploaded to your RSP account via our WebDAV service has been increased from 100MB to a whopping 2GB. Enjoy!