The air conditioning suffered from the current heat wave in Strasbourg (temperatures reaching 40°C), and some servers have been disconnected, causing interruption of the following services : CDS portal, Xmatch service, A&A mirror, Aladin image preview.
All these services should be back on Monday, July 6.
Sorry for the inconvenience.
External temperatures have cooled (a little), and all services are running again as of Monday, July 6.
On top of a SIMBAD object web page, the list of "Other object types"
now contains links ("Ref") to articles giving this object type.
Note that "Other object types" are mostly linked to acronyms. They are chosen according to the original reference of the acronym and usually true for most of the listed objects.