fix: ucd keyword had a typo

Author: ManonMarchand

CHANGES.rst

@@ -149,6 +149,11 @@ skyview
 - Overlay arguments ``lut``, ``grid``, and ``gridlabel`` are removed, as they
   only apply to output types not returned by Astroquery [#2979]
 
+vizier
+^^^^^^
+
+- Fixed search by UCD -- they were ignored. [#3147]
+
 vsa
 ^^^
 

astroquery/vizier/core.py

@@ -78,7 +78,7 @@ def __init__(self, *, columns=["*"], column_filters={}, catalog=None,
         self.column_filters = column_filters
         self.catalog = catalog
         self._keywords = None
-        self.ucd = ucd
+        self._ucd = ucd
         if keywords:
             self.keywords = keywords
         self.TIMEOUT = timeout
@@ -233,7 +233,7 @@ def find_catalogs(self, keywords, *, include_obsolete=False, verbose=False,
             data_payload["-obsolete"] = None
 
         if self.ucd != "":
-            data_payload["ucd"] = self.ucd
+            data_payload["-ucd"] = self.ucd
 
         params = "&".join([k if v is None else f"{k}={v}" for k, v in data_payload.items()])
 

astroquery/vizier/tests/test_vizier_remote.py

@@ -131,7 +131,6 @@ def test_findcatalog_maxcatalog(self):
         assert len(cats) >= 39  # as of 2024
 
     def test_findcatalog_ucd(self):
-        # this fails for VizieR 7.33.3, should work in next releases
         vizier = Vizier()
         ucdresult = vizier(ucd='phys.albedo').find_catalogs('mars', max_catalogs=5000)
         result = vizier.find_catalogs('mars', max_catalogs=5000)