diff --git a/Observatory/CDPP-AMDA/MMS.xml b/Observatory/CDPP-AMDA/MMS.xml
index 4ce18a2..f08fcec 100644
--- a/Observatory/CDPP-AMDA/MMS.xml
+++ b/Observatory/CDPP-AMDA/MMS.xml
@@ -5,9 +5,9 @@
     <ResourceID>spase://CNES/Observatory/CDPP-AMDA/MMS</ResourceID>
     <ResourceHeader>
       <ResourceName>MMS</ResourceName>
-      <AlternateName></AlternateName>
+      <AlternateName>Magnetospheric Multiscale Mission</AlternateName>
       <ReleaseDate>2019-03-01T20:05:54Z</ReleaseDate>
-      <Description></Description>
+      <Description>MMS consists of four identical spacecraft that orbit around Earth through the dynamic magnetic system surrounding our planet to study a little-understood phenomenon called magnetic reconnection.</Description>
       <Contact>
         <PersonID>spase://SMWG/Person/Thomas.Moore</PersonID>
         <Role>ProjectScientist</Role>
diff --git a/Observatory/CDPP-AMDA/MMS1.xml b/Observatory/CDPP-AMDA/MMS1.xml
index 0b9a48a..aa532ac 100644
--- a/Observatory/CDPP-AMDA/MMS1.xml
+++ b/Observatory/CDPP-AMDA/MMS1.xml
@@ -5,11 +5,11 @@
     <ResourceID>spase://CNES/Observatory/CDPP-AMDA/MMS1</ResourceID>
     <ResourceHeader>
       <ResourceName>MMS1</ResourceName>
-      <AlternateName></AlternateName>
+      <AlternateName>Magnetospheric Multiscale Mission #1</AlternateName>
       <ReleaseDate>2019-03-01T20:05:54Z</ReleaseDate>
       <Description></Description>
       <Contact>
-        <PersonID>spase://CNES/Person/</PersonID>
+        <PersonID>spase://SMWG/Person/Thomas.Moore</PersonID>
         <Role>ProjectScientist</Role>
       </Contact>
     </ResourceHeader>
@@ -17,5 +17,8 @@
     <Location>
        <ObservatoryRegion>Earth.Magnetosphere</ObservatoryRegion>
     </Location>
+    <OperatingSpan>
+      <StartDate>2015-09-01T00:00:00</StartDate>
+    </OperatingSpan>
   </Observatory>
 </Spase>
diff --git a/Observatory/CDPP-AMDA/MMS1234.xml b/Observatory/CDPP-AMDA/MMS1234.xml
index 1361dc7..ac90a72 100644
--- a/Observatory/CDPP-AMDA/MMS1234.xml
+++ b/Observatory/CDPP-AMDA/MMS1234.xml
@@ -3,7 +3,8 @@
  <Observatory>
   <ResourceID>spase://CNES/Observatory/CDPP-AMDA/MMS1234</ResourceID>
   <ResourceHeader>
-   <ResourceName>MMS1234</ResourceName>
+   <ResourceName>MMS_1234</ResourceName>
+   <AlternateName>Magnetospheric Multiscale Mission : 4 s/c</AlternateName>
    <ReleaseDate>2019-03-01T20:05:54Z</ReleaseDate>
    <Description>Observatory combining the measurements providing by the 4 MMS probes, MMS1, MMS2, MMS3 and MMS4</Description>
    <Contact>
diff --git a/Observatory/CDPP-AMDA/MMS2.xml b/Observatory/CDPP-AMDA/MMS2.xml
index 8b09044..df8114e 100644
--- a/Observatory/CDPP-AMDA/MMS2.xml
+++ b/Observatory/CDPP-AMDA/MMS2.xml
@@ -5,7 +5,7 @@
     <ResourceID>spase://CNES/Observatory/CDPP-AMDA/MMS2</ResourceID>
     <ResourceHeader>
       <ResourceName>MMS2</ResourceName>
-      <AlternateName></AlternateName>
+      <AlternateName>Magnetospheric Multiscale Mission #2</AlternateName>
       <ReleaseDate>2019-03-01T20:05:54Z</ReleaseDate>
       <Description></Description>
       <Contact>
diff --git a/Observatory/CDPP-AMDA/MMS3.xml b/Observatory/CDPP-AMDA/MMS3.xml
index 9adcc08..9015ed5 100644
--- a/Observatory/CDPP-AMDA/MMS3.xml
+++ b/Observatory/CDPP-AMDA/MMS3.xml
@@ -5,7 +5,7 @@
     <ResourceID>spase://CNES/Observatory/CDPP-AMDA/MMS3</ResourceID>
     <ResourceHeader>
       <ResourceName>MMS3</ResourceName>
-      <AlternateName></AlternateName>
+      <AlternateName>Magnetospheric Multiscale Mission #3</AlternateName>
       <ReleaseDate>2019-03-01T20:05:54Z</ReleaseDate>
       <Description></Description>
       <Contact>
--
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