Planned maintenance outage of SDSS systems
On 2 and 3 June 2026 some of the infrastructure that hosts the SDSS data systems will undergo maintenance. That means that during this time, you may see some disruptions in our services: this will mainly affect the Science Archive Server (SAS), Zora and Valis, and the SAS webapp. If you cannot access SDSS data through these systems during this maintenance period, then please use one of the alternatives listed below, or check back at a later time.
SDSS Systems
You may check the status of these systems, with various methods available to access the data:
| System | URL | Access Methods |
| Data Transfer Node (DTN) | rsync://dtn.sdss.org | rsync via a dedicated node |
| Science Archive Server (SAS) | https://data.sdss.org/sas | wget, curl over https rsync (DTN preferred) |
| SkyServer | https://skyserver.sdss.org | SQL, Jupyter Notebooks |
| CasJobs via SkyServer | https://skyserver.sdss.org/casjobs | Large SQL jobs |
| SAS Webapp (SDSS-I-IV) | https://data.sdss.org/home | Search, View, Download |
| Marvin | https://dr17.sdss.org/marvin | Web, Command-line, API |
| Zora (SDSS-V) | https://dr19.sdss.org/zora/ | Web, Command-line, API |