Is there a way to get Article ObjectID with RMO ?

Merge replication on SQL 2014.

Is there a way to obtain the value in sysMergeArticles.ObjId through RMO ? I don't see any properties containing it in the RMO class.

PS Code : 

$publisher = "SRV-ONECMR"
$RMOserver = New-Object ('Microsoft.SqlServer.Replication.ReplicationServer') -argumentlist $publisher -ErrorAction Stop
$RMOserver.ReplicationDatabases['Arizona'].MergePublications['Arizona_OU'].MergeArticles | select *

SQL Code: 

SELECT a.Name, a.objid
FROM Arizona.dbo.sysmergearticles AS a