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        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE J, PART I, #3 AND PART II:</FormAndLineReferenceDesc>
        <ExplanationTxt>The officers of the Astrophysical Research Consortium (ARC) receive compensation for their work with ARC from the respective universities, NMSU, JHU and U-Washington, unrelated exempt organizations. ARC reimburses the organizations for their compensation.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part I, Line 6, Volunteers:</FormAndLineReferenceDesc>
        <ExplanationTxt>The volunteers are the independent board members.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 6</FormAndLineReferenceDesc>
        <ExplanationTxt>ARC is a consortium consisting of eight member universities.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 7a</FormAndLineReferenceDesc>
        <ExplanationTxt>Each member of ARC has two representatives on the Board of Governors, who are appointed by the member institutions' academic administrations.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 7b</FormAndLineReferenceDesc>
        <ExplanationTxt>Members have approval rights in accordance with Title 24 of the Washington non-profit corporation act.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>Each member of the Board of Governors is given a copy of the Form 990 prior to its submission.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>All Board members and officers of ARC are covered by a Conflict of Interest Policy. There are bi-annual reviews of the individual Conflict of Interest statements by the governance committee, which determines whether a conflict exists. All statements are kept on file. Board members are expected to disclose conflicts as they may arise on the honor system, with the oversight of the governance committee. If a conflict exists or arises during the course of the business, the governance committee investigates and determines any action to take in accordance with the policy. This may include a member being prohibited from participating in the deliberations and decisions with respect to the transaction.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>ARC makes governing documents available to the public upon request.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part XI, Line 8, Prior Period Adjustments:</FormAndLineReferenceDesc>
        <ExplanationTxt>The 2016 audited financial statements were finalized after the 2016 tax return was filed. The prior period adjustment shown on the 2017 Form 990, Part XI, reflects audit changes to the beginning of year amounts shown on the 2017 Form 990, Part X, Column (A).</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>