how to execute a stored procedure like sysadmin or workaround for checking mirroring

Hello,

I try to create a stored prod for checking db mirroring without be sysadmin :
create procedure check_mirror WITH EXECUTE AS ...  AS

set nocount on;
SELECT a.name +'|'+ CAST(isnull(b.mirroring_role,'') AS varchar(15)) +'|'+ CAST(isnull(b.mirroring_partner_instance,'') AS varchar(15))from sys.databases a INNER JOIN sys.database_mirroring b ON a.database_id=b.database_id where mirroring_role is null or mirroring_role=1 or mirroring_role=2

Thanks
bibi