Getting Data from SCCM

Getting data from SCCM via Get-WmiObject

If anyone can help me out I would certainly appreciate it. I'm new to powershell and I'm not understanding it very well.

Here is what I'm trying to do, I have a script that pull computername from a txt file and does a foreach to bring back the data for each computer. I guess my syntax is not correct and I've been looking everywhere for information on how to do this.

Here is my script below.

    $list = import-csv -path '.\Computers.txt'

    $objectCollection=@()

    $list | %{
        $wmi_computersystem = Get-WmiObject -Class win32_ComputerSystem -ComputerName $_.computername
        $wmi_SCCM = Get-WmiObject -Class SMS_R_System -ComputerName HFDSCCM -Namespace "root\SMS\Site_HFD" -Filter $("Name = '$_.computername'")

        $object = New-Object psobject
        Add-Member -InputObject $object -MemberType NoteProperty -Name Name -Value $wmi_computersystem.Name
        Add-Member -InputObject $object -MemberType NoteProperty -Name SCCM_HostName -Value $wmi_SCCM.Name
        Add-Member -InputObject $object -MemberType NoteProperty -Name SCCM_OS -Value $wmi_SCCM.ADSiteName
       
       
                $objectCollection +=  $object

        $object
$objectCollection | export-csv -path '.\ComputerInfo.csv' -NoTypeInformation -Append
    }