Liabilities / Assets
30th percentile
Higher debt load relative to assets than 30% of similar nonprofits.
EIN 86-0724677 • 501(c)3 • Tucson, AZ
Profile
The lbt corporation's purpose is to maintain and operate a large optical observatory for astronomical research which will expand humanity's knowledge of space from the vicinity of earth to the edge of the observable universe.
Precomputed percentiles relative to similar nonprofits. These scores are descriptive rather than judgmental.
Liabilities / Assets
30th percentile
Higher debt load relative to assets than 30% of similar nonprofits.
Liabilities / Revenue
60th percentile
Higher debt load relative to revenue than 60% of similar nonprofits.
Net Margin
5th percentile
Higher net margin than 5% of similar nonprofits.
Top Officer Pay
8th percentile
Higher top officer pay than 8% of similar nonprofits.
Top officer pay equals 0.2% of source-year revenue.
Asset Growth
10th percentile
Faster asset growth than 10% of similar nonprofits.
Revenue Growth
6th percentile
Faster revenue growth than 6% of similar nonprofits.
Assets
Down$94,570,234
Down $7,009,356 (-6.9%) from 2023
Liabilities
Down$7,563,457
Down $159,467 (-2.1%) from 2023
Net Assets
Down$87,006,777
Down $6,849,889 (-7.3%) from 2023
Revenue
Down$15,240,683
Down $8,879,745 (-37%) from 2023
Expenses
Down$22,090,572
Down $480,964 (-2.1%) from 2023
Net Income
Down-$6,849,889
Down $8,398,781 (-542%) from 2023
Most recent year
2024 • Form 990Detailed filing. Detailed filing data is available for this year.
The LBT Corporation's purpose is to maintain and operate a large optical observatory for astronomical research which will expand mankind's knowledge of space from the vicinity of Earth to the edge of the observable universe.
To construct and operate a research facility known as the Large Binocular Telescope.
| Line | Beginning | End | Change |
|---|---|---|---|
| Assets | |||
| Land, Buildings, and Equipment, Net | $97,459,680 | $89,180,740 | ▼ $8,278,940 |
| Cash and Non-Interest-Bearing Accounts | $3,011,888 | $4,235,240 | ▲ $1,223,352 |
| Savings and Temporary Cash Investments | $1,035,000 | $1,069,650 | ▲ $34,650 |
| Prepaid Expenses and Deferred Charges | $73,022 | $84,604 | ▲ $11,582 |
| Total Assets | $101,579,590 | $94,570,234 | ▼ $7,009,356 |
| Liabilities | |||
| Other Liabilities | $7,411,187 | $7,284,547 | ▼ $126,640 |
| Accounts Payable and Accrued Expenses | $311,737 | $278,910 | ▼ $32,827 |
| Total Liabilities | $7,722,924 | $7,563,457 | ▼ $159,467 |
| Net Assets / Fund Balance | |||
| Net Assets Without Donor Restrictions | $93,856,666 | $87,006,777 | ▼ $6,849,889 |
| Total Net Assets Fund Balance | $93,856,666 | $87,006,777 | ▼ $6,849,889 |
| Total Liabilities and Net Assets / Fund Balance | $101,579,590 | $94,570,234 | ▼ $7,009,356 |
| Asset | Book Value | Depreciation | Basis |
|---|---|---|---|
| Equipment | $48,261,342 | $65,605,367 | $113,866,709 |
| Buildings | $40,919,398 | $31,612,311 | $72,531,709 |
| Name | Title | Base | Total |
|---|---|---|---|
| Adriano Fontana | Chiarman & President | $27,500 | $27,500 |
| Name | Title |
|---|---|
| Chris Kochanek | Vice Chairman |
| Andreas Quirrenbach | Director |
| Dennis Zaritsky | Director |
| Evan Kirby | Director |
| Matthias Steinmetz | Director |
| Roberto Ragazzoni | Director |
| Buell Jannuzi | Director & Member Representative |
| Fillippo Zerbi | Member Representative |
| Hans-Walter Rix | Member Representative |
| Susan Olesik | Member Representative |
| Elizabeth Green | Secretary |
| Mathias Voss | Treasurer |
| Contractor | Services | Location | Compensation |
|---|---|---|---|
| ADS International | Design/Fabrication/Testing/Calibration | Via Pio Galli Sindacalist 3, Lecco, It | $165,489 |
| Line Item | Amount |
|---|---|
| Other Expenses | $22,053,072 |
| Salaries, Compensation, and Employee Benefits | $27,500 |
| Grants and Similar Amounts Paid | $10,000 |
| Professional Fundraising Fees | $0 |
| Total Fundraising Expense | $0 |
| Line Item | Program | Management | Fundraising | Total |
|---|---|---|---|---|
| Depreciation Depletion | $8,596,364 | - | - | $8,596,364 |
| Occupancy | $1,156,539 | - | - | $1,156,539 |
| Other Expenses | $766,905 | $2,012,731 | - | $766,905 |
| Fees for Services Other | $317,739 | $52,116 | - | $369,855 |
| All Other Expenses | $155,679 | - | - | $155,679 |
| Travel | $84,736 | - | - | $84,736 |
| Advertising | - | $47,329 | - | $47,329 |
| Office Expenses | $39,521 | $1,752 | - | $41,273 |
| Fees for Services Accounting | - | $28,860 | - | $28,860 |
| Current Officers, Directors, Trustees, and Key Employees | - | $27,500 | - | $27,500 |
| Information Technology | $23,229 | - | - | $23,229 |
| Conferences and Meetings | $1,520 | $20,134 | - | $21,654 |
| Grants to Domestic Individuals | $10,000 | - | - | $10,000 |
| Insurance | - | $3,643 | - | $3,643 |
| Total Functional Expenses | $19,896,507 | $2,194,065 | $0 | $22,090,572 |
| Line Item | Amount |
|---|---|
| Expenses per Audited Statements | $22,090,572 |
| Total Expenses per Audited Statements | $22,090,572 |
| Total Expenses per Form 990 | $22,090,572 |
| Expenses Not Reported on Financial Statements | $0 |
| Expenses Not Reported on Form 990 | $0 |
| Line Item | Amount |
|---|---|
| Professional Fundraising Fees | $0 |
| Interested Party | Relationship | Description | Shared Revenue | Amount |
|---|---|---|---|---|
| - | Founding Member of the Organization (Operations Support Agreement) | Quarterly payments for salary, equipment and supply charges to UA accounts. | No | $9,290,545 |
| Liability | Amount |
|---|---|
| Asset Retirement Obligation | $5,000,000 |
| Due to Related Parties | $2,207,816 |
| Member Prepayment | $76,731 |
“The Organization is supported by members which have agreed to continue to support the telescope program through member contributions proportionate to their membership levels. The members are allocated time for telescope use proportionate to their contributions made through both cash and non-cash payments.”
“Members of the Organization appoint members to the Board of Directors.”
“Amendments of the Articles of Incorporation require unanimous approval of members.”
“Contemporaneous documentation is taken at Governing Body meetings. However, documentation is not taken at Committee meetings.”
“The Business Manager will conduct an initial review of the Form 990. The Finance committee then reviews the Form 990 on behalf of the Board of Directors. Upon approval of the Finance Committee, the Board is notified that the Form 990 is available on-line and the President is authorized to sign the Form 990 for submission to the IRS.”
“The Corporate Secretary distributes annual Conflict of Interest forms to all directors, officers, member representatives, voting members of the Board Finance Committee, members of the Board Scientific Advisory Committee, the Observatory director and business manager. By signing the forms and returning them to the Secretary, these people affirm that they have read and understand the Conflict of Interest policy of the LBT Corporation and have disclosed any possible conflicts. The Secretary reviews the forms for any disclosures and keeps them with the corporate records. Any disclosed conflicts are referred to the Board for their information. Any further action concerning disclosed conflicts or possible conflicts are handled according to the procedures contained in the LBT Corporation Conflict of Interest policy.”
“Only one director receives a fee for service on the Board. That fee was set after review by the independent directors of the Corporation in consultation with the Corporation's audit and tax advisors. It was increased by the Board to $30,000 in April 2024. The first payment was $5,000 based on the previous compensation of $20,000, and the remaining three payments were $7,500 each, totaling $27,500 for 2024. The salary of the Observatory Director, and all other employees, is set by the University of Arizona pursuant to an operational support agreement with the LBT Corporation.”
“The governing documents and financial statements are available upon request.”
“The Corporation is exempt from income taxes under both Federal Internal Revenue Code ("IRC") Section 501(c)(3) and Arizona income tax laws, and is classified as other than a private foundation under IRC Section 509(a)(1). The Corporation also qualifies for the charitable contribution deduction under IRC Section 170(b)(1)(a). Management has considered its tax positions in accordance with the accounting standard for uncertainty in income taxes and believes that all of the positions taken in its federal and state exempt organization tax returns are more likely than not to be sustained upon examination. Management is not aware of any matters which would cause the Corporation to lose its tax-exempt status. The Corporation's returns are subject to examination by federal and state taxing authorities, generally for three years and four years, respectively, after they are filed. Should the Corporation ever be subject to interest and penalties related to unrecognized tax benefits, they would be classified in general and administrative expenses in the accompanying financial statements. During the years ended December 31, 2024 and 2023, the Corporation did not recognize any interest and penalties.”
This appendix keeps the raw XML leaves available for debugging and edge-case review. The human report above is the primary experience.
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| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 278910 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | 0 |
| IRS990/ActivityOrMissionDesc | 0 | To construct and operate a research facility known as the Large Binocular Telescope. |
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| IRS990/AdvertisingGrp/TotalAmt | 0 | 47329 |
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| IRS990/AllOtherExpensesGrp/ProgramServicesAmt | 0 | 155679 |
| IRS990/AllOtherExpensesGrp/TotalAmt | 0 | 155679 |
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| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 5206265231 |
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| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | Tucson |
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| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 85721 |
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| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 3011888 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 4235240 |
| IRS990/ChangeToOrgDocumentsInd | 0 | 0 |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 1 |
| IRS990/CollectionsOfArtInd | 0 | 0 |
| IRS990/CompCurrentOfcrDirectorsGrp/ManagementAndGeneralAmt | 0 | 27500 |
| IRS990/CompCurrentOfcrDirectorsGrp/TotalAmt | 0 | 27500 |
| IRS990/CompensationFromOtherSrcsInd | 0 | 0 |
| IRS990/CompensationProcessCEOInd | 0 | 0 |
| IRS990/CompensationProcessOtherInd | 0 | 1 |
| IRS990/ConferencesMeetingsGrp/ManagementAndGeneralAmt | 0 | 20134 |
| IRS990/ConferencesMeetingsGrp/ProgramServicesAmt | 0 | 1520 |
| IRS990/ConferencesMeetingsGrp/TotalAmt | 0 | 21654 |
| IRS990/ConflictOfInterestPolicyInd | 0 | 1 |
| IRS990/ConservationEasementsInd | 0 | 0 |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | 0 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 0 | 165489 |
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| IRS990/CYContributionsGrantsAmt | 0 | 15123001 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 10000 |
| IRS990/CYInvestmentIncomeAmt | 0 | 63939 |
| IRS990/CYOtherExpensesAmt | 0 | 22053072 |
| IRS990/CYOtherRevenueAmt | 0 | 53743 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 0 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | -6849889 |
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| IRS990/CYTotalExpensesAmt | 0 | 22090572 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 0 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 15240683 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | 1 |
| IRS990/DeductibleArtContributionInd | 0 | 0 |
| IRS990/DeductibleNonCashContriInd | 0 | 0 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | 0 |
| IRS990/DepreciationDepletionGrp/ProgramServicesAmt | 0 | 8596364 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 8596364 |
| IRS990/Desc | 0 | A total of 280 nights were offered to the LBTO partners and science staff in 2024 for scientific observations, while 22 were devoted to engineering work. Poor weather conditions resulted in a loss of 37% of science observing time during 2024, which is somewhat better than the long-term average.A total of 48 scientific papers based on LBT data were published in 2024 in refereed journals. |
| IRS990/DescribedInSection501c3Ind | 0 | 1 |
| IRS990/DisregardedEntityInd | 0 | 0 |
| IRS990/DocumentRetentionPolicyInd | 0 | 1 |
| IRS990/DonorAdvisedFundInd | 0 | 0 |
| IRS990/DonorRstrOrQuasiEndowmentsInd | 0 | 0 |
| IRS990/ElectionOfBoardMembersInd | 0 | 1 |
| IRS990/EmployeeCnt | 0 | 0 |
| IRS990/EngagedInExcessBenefitTransInd | 0 | 0 |
| IRS990/ExpenseAmt | 0 | 19896507 |
| IRS990/FamilyOrBusinessRlnInd | 0 | 0 |
| IRS990/FederalGrantAuditRequiredInd | 0 | 0 |
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| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 28860 |
| IRS990/FeesForServicesOtherGrp/ManagementAndGeneralAmt | 0 | 52116 |
| IRS990/FeesForServicesOtherGrp/ProgramServicesAmt | 0 | 317739 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 369855 |
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| IRS990/ForeignFinancialAccountInd | 0 | 0 |
| IRS990/ForeignOfficeInd | 0 | 0 |
| IRS990/Form8282PropertyDisposedOfInd | 0 | 0 |
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| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 10 | 2.00 |
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| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 12 | 2.00 |
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| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 4 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 5 | X |
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| IRS990/Form990PartVIISectionAGrp/OfficerInd | 1 | X |
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| IRS990/Form990PartVIISectionAGrp/OfficerInd | 3 | X |
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| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | Roberto Ragazzoni |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | Matthias Steinmetz |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | Evan Kirby |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | Dennis Zaritsky |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | Buell Jannuzi |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | Hans-Walter Rix |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | Susan Olesik |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | Fillippo Zerbi |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | Mathias Voss |
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| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | Director & Member Representative |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | Member Representative |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | Member Representative |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | Member Representative |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 11 | Treasurer |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 12 | Secretary |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | 1 |
| IRS990/FormationYr | 0 | 1992 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | 0 |
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| IRS990/FSAuditedInd | 0 | 1 |
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| IRS990/GamingActivitiesInd | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 11 |
| IRS990/GovernmentGrantsAmt | 0 | 7561501 |
| IRS990/GrantAmt | 0 | 10000 |
| IRS990/GrantsToDomesticIndividualsGrp/ProgramServicesAmt | 0 | 10000 |
| IRS990/GrantsToDomesticIndividualsGrp/TotalAmt | 0 | 10000 |
| IRS990/GrantsToIndividualsInd | 0 | 1 |
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| IRS990/InformationTechnologyGrp/ProgramServicesAmt | 0 | 23229 |
| IRS990/InformationTechnologyGrp/TotalAmt | 0 | 23229 |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 3643 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 3643 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 63939 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 63939 |
| IRS990/InvestmentInJointVentureInd | 0 | 0 |
| IRS990/IRPDocumentCnt | 0 | 3 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 97217678 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 97459680 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 89180740 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 186398418 |
| IRS990/LegalDomicileStateCd | 0 | AZ |
| IRS990/LoanOutstandingInd | 0 | 0 |
| IRS990/LobbyingActivitiesInd | 0 | 0 |
| IRS990/LocalChaptersInd | 0 | 0 |
| IRS990/MaterialDiversionOrMisuseInd | 0 | 0 |
| IRS990/MembersOrStockholdersInd | 0 | 1 |
| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | 0 |
| IRS990/MinutesOfGoverningBodyInd | 0 | 1 |
| IRS990/MissionDesc | 0 | The LBT Corporation's purpose is to maintain and operate a large optical observatory for astronomical research which will expand humanity's knowledge of space from the vicinity of Earth to the edge of the observable universe. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | 0 |
| IRS990/MoreThan5000KToOrgInd | 0 | 0 |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 93856666 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 87006777 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 0 |
| IRS990/NoDonorRestrictionNetAssetsGrp/BOYAmt | 0 | 93856666 |
| IRS990/NoDonorRestrictionNetAssetsGrp/EOYAmt | 0 | 87006777 |
| IRS990/NondeductibleContributionsInd | 0 | 0 |
| IRS990/OccupancyGrp/ProgramServicesAmt | 0 | 1156539 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 1156539 |
| IRS990/OfficeExpensesGrp/ManagementAndGeneralAmt | 0 | 1752 |
| IRS990/OfficeExpensesGrp/ProgramServicesAmt | 0 | 39521 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 41273 |
| IRS990/OfficerMailingAddressInd | 0 | 0 |
| IRS990/OperateHospitalInd | 0 | 0 |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsFASB117Ind | 0 | X |
| IRS990/OtherChangesInNetAssetsAmt | 0 | 0 |
| IRS990/OtherExpensesGrp/Desc | 0 | Contract Personnel |
| IRS990/OtherExpensesGrp/Desc | 1 | UA Support Services |
| IRS990/OtherExpensesGrp/Desc | 2 | MGIO Contract Services |
| IRS990/OtherExpensesGrp/Desc | 3 | Other Operating Expense |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 0 | 2012731 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 7109041 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 1 | 1635234 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 2 | 766905 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 7109041 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 2012731 |
| IRS990/OtherExpensesGrp/TotalAmt | 2 | 1635234 |
| IRS990/OtherExpensesGrp/TotalAmt | 3 | 766905 |
| IRS990/OtherLiabilitiesGrp/BOYAmt | 0 | 7411187 |
| IRS990/OtherLiabilitiesGrp/EOYAmt | 0 | 7284547 |
| IRS990/OtherRevenueMiscGrp/BusinessCd | 0 | 900099 |
| IRS990/OtherRevenueMiscGrp/Desc | 0 | Miscellaneous Income |
| IRS990/OtherRevenueMiscGrp/ExclusionAmt | 0 | 53743 |
| IRS990/OtherRevenueMiscGrp/TotalRevenueColumnAmt | 0 | 53743 |
| IRS990/OtherRevenueTotalAmt | 0 | 53743 |
| IRS990/OtherWebsiteInd | 0 | X |
| IRS990/PartialLiquidationInd | 0 | 0 |
| IRS990/PayPremiumsPrsnlBnftCntrctInd | 0 | 0 |
| IRS990/PoliticalCampaignActyInd | 0 | 0 |
| IRS990/PrepaidExpensesDefrdChargesGrp/BOYAmt | 0 | 73022 |
| IRS990/PrepaidExpensesDefrdChargesGrp/EOYAmt | 0 | 84604 |
| IRS990/PrincipalOfficerNm | 0 | Adriano Fontana |
| IRS990/ProfessionalFundraisingInd | 0 | 0 |
| IRS990/ProhibitedTaxShelterTransInd | 0 | 0 |
| IRS990/PYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/PYContributionsGrantsAmt | 0 | 24078690 |
| IRS990/PYExcessBenefitTransInd | 0 | 0 |
| IRS990/PYGrantsAndSimilarPaidAmt | 0 | 10000 |
| IRS990/PYInvestmentIncomeAmt | 0 | 41172 |
| IRS990/PYOtherExpensesAmt | 0 | 22541536 |
| IRS990/PYOtherRevenueAmt | 0 | 566 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 0 |
| IRS990/PYRevenuesLessExpensesAmt | 0 | 1548892 |
| IRS990/PYSalariesCompEmpBnftPaidAmt | 0 | 20000 |
| IRS990/PYTotalExpensesAmt | 0 | 22571536 |
| IRS990/PYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/PYTotalRevenueAmt | 0 | 24120428 |
| IRS990/QuidProQuoContributionsInd | 0 | 0 |
| IRS990/RcvFndsToPayPrsnlBnftCntrctInd | 0 | 0 |
| IRS990/ReconcilationRevenueExpnssAmt | 0 | -6849889 |
| IRS990/RegularMonitoringEnfrcInd | 0 | 1 |
| IRS990/RelatedEntityInd | 0 | 0 |
| IRS990/RelatedOrganizationCtrlEntInd | 0 | 0 |
| IRS990/ReportInvestmentsOtherSecInd | 0 | 0 |
| IRS990/ReportLandBuildingEquipmentInd | 0 | 1 |
| IRS990/ReportOtherAssetsInd | 0 | 0 |
| IRS990/ReportOtherLiabilitiesInd | 0 | 1 |
| IRS990/ReportProgramRelatedInvstInd | 0 | 0 |
| IRS990/RevenueAmt | 0 | 0 |
| IRS990/SavingsAndTempCashInvstGrp/BOYAmt | 0 | 1035000 |
| IRS990/SavingsAndTempCashInvstGrp/EOYAmt | 0 | 1069650 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearAmt | 0 | 15123001 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus1YearAmt | 0 | 24078690 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 12373805 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 11908500 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 12292800 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/TotalAmt | 0 | 75776796 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearAmt | 0 | 63939 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus1YearAmt | 0 | 13149 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 318 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 48 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 41 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/TotalAmt | 0 | 77495 |
| IRS990ScheduleA/OtherIncome170Grp/CurrentTaxYearAmt | 0 | 53743 |
| IRS990ScheduleA/OtherIncome170Grp/CurrentTaxYearMinus1YearAmt | 0 | 566 |
| IRS990ScheduleA/OtherIncome170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 2153 |
| IRS990ScheduleA/OtherIncome170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 476 |
| IRS990ScheduleA/OtherIncome170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 2045 |
| IRS990ScheduleA/OtherIncome170Grp/TotalAmt | 0 | 58983 |
| IRS990ScheduleA/PublicOrganization170Ind | 0 | X |
| IRS990ScheduleA/PublicSupportCY170Pct | 0 | 0.53530 |
| IRS990ScheduleA/PublicSupportPY170Pct | 0 | 0.53230 |
| IRS990ScheduleA/PublicSupportTotal170Amt | 0 | 40638202 |
| IRS990ScheduleA/SubstantialContributorsTotAmt | 0 | 35138594 |
| IRS990ScheduleA/ThirtyThrPctSuprtTestsCY170Ind | 0 | X |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearAmt | 0 | 15123001 |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus1YearAmt | 0 | 24078690 |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 12373805 |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 11908500 |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 12292800 |
| IRS990ScheduleA/TotalCalendarYear170Grp/TotalAmt | 0 | 75776796 |
| IRS990ScheduleA/TotalSupportAmt | 0 | 75913274 |
| IRS990ScheduleB/ContributorInformationGrp/ContributorBusinessName/BusinessNameLine1 | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorNum | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/AddressLine1 | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/AddressLine2 | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/City | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/State | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/ZIPCode | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/TotalContributionsAmt | 0 | RESTRICTED |
| IRS990/ScheduleBRequiredInd | 0 | 1 |
| IRS990ScheduleD/BuildingsGrp/BookValueAmt | 0 | 40919398 |
| IRS990ScheduleD/BuildingsGrp/DepreciationAmt | 0 | 31612311 |
| IRS990ScheduleD/BuildingsGrp/OtherCostOrOtherBasisAmt | 0 | 72531709 |
| IRS990ScheduleD/EquipmentGrp/BookValueAmt | 0 | 48261342 |
| IRS990ScheduleD/EquipmentGrp/DepreciationAmt | 0 | 65605367 |
| IRS990ScheduleD/EquipmentGrp/OtherCostOrOtherBasisAmt | 0 | 113866709 |
| IRS990ScheduleD/ExpensesNotReportedAmt | 0 | 0 |
| IRS990ScheduleD/ExpensesNotRptFinclStmtAmt | 0 | 0 |
| IRS990ScheduleD/ExpensesSubtotalAmt | 0 | 22090572 |
| IRS990ScheduleD/FootnoteTextInd | 0 | X |
| IRS990ScheduleD/OtherLiabilitiesOrgGrp/Amt | 0 | 5000000 |
| IRS990ScheduleD/OtherLiabilitiesOrgGrp/Amt | 1 | 2207816 |
| IRS990ScheduleD/OtherLiabilitiesOrgGrp/Amt | 2 | 76731 |
| IRS990ScheduleD/OtherLiabilitiesOrgGrp/Desc | 0 | Asset Retirement Obligation |
| IRS990ScheduleD/OtherLiabilitiesOrgGrp/Desc | 1 | Due to Related Parties |
| IRS990ScheduleD/OtherLiabilitiesOrgGrp/Desc | 2 | Member Prepayment |
| IRS990ScheduleD/RevenueNotReportedAmt | 0 | 0 |
| IRS990ScheduleD/RevenueNotReportedFinclStmtAmt | 0 | 0 |
| IRS990ScheduleD/RevenueSubtotalAmt | 0 | 15240683 |
| IRS990ScheduleD/SupplementalInformationDetail/ExplanationTxt | 0 | The Corporation is exempt from income taxes under both Federal Internal Revenue Code ("IRC") Section 501(c)(3) and Arizona income tax laws, and is classified as other than a private foundation under IRC Section 509(a)(1). The Corporation also qualifies for the charitable contribution deduction under IRC Section 170(b)(1)(a). Management has considered its tax positions in accordance with the accounting standard for uncertainty in income taxes and believes that all of the positions taken in its federal and state exempt organization tax returns are more likely than not to be sustained upon examination. Management is not aware of any matters which would cause the Corporation to lose its tax-exempt status. The Corporation's returns are subject to examination by federal and state taxing authorities, generally for three years and four years, respectively, after they are filed. Should the Corporation ever be subject to interest and penalties related to unrecognized tax benefits, they would be classified in general and administrative expenses in the accompanying financial statements. During the years ended December 31, 2024 and 2023, the Corporation did not recognize any interest and penalties. |
| IRS990ScheduleD/SupplementalInformationDetail/FormAndLineReferenceDesc | 0 | Part X, Line 2: |
| IRS990ScheduleD/TotalBookValueLandBuildingsAmt | 0 | 89180740 |
| IRS990ScheduleD/TotalExpensesPerForm990Amt | 0 | 22090572 |
| IRS990ScheduleD/TotalLiabilityAmt | 0 | 7284547 |
| IRS990ScheduleD/TotalRevenuePerForm990Amt | 0 | 15240683 |
| IRS990ScheduleD/TotalRevEtcAuditedFinclStmtAmt | 0 | 15240683 |
| IRS990ScheduleD/TotExpnsEtcAuditedFinclStmtAmt | 0 | 22090572 |
| IRS990ScheduleI/GrantRecordsMaintainedInd | 0 | 1 |
| IRS990ScheduleI/GrantsOtherAsstToIndivInUSGrp/CashGrantAmt | 0 | 10000 |
| IRS990ScheduleI/GrantsOtherAsstToIndivInUSGrp/GrantTypeTxt | 0 | Eastern Arizona College Foundation Scholarship |
| IRS990ScheduleI/GrantsOtherAsstToIndivInUSGrp/RecipientCnt | 0 | 2 |
| IRS990ScheduleI/SupplementalInformationDetail/ExplanationTxt | 0 | The Large Binocular Telescope Observatory provides scholarship funding to the Eastern Arizona College Foundation to support enrolled members of the San Carlos or White Mountain Apache Tribes at Eastern Arizona College. The Eastern Arizona college admissions office selects eligible students for the scholarship to fund their tuition costs. The Large Binocular Telescope Observatory is notified when each new recipient is selected by the Eastern Arizona College Foundation. |
| IRS990ScheduleI/SupplementalInformationDetail/FormAndLineReferenceDesc | 0 | Part I, Line 2: |
| IRS990/ScheduleJRequiredInd | 0 | 0 |
| IRS990ScheduleL/BusTrInvolveInterestedPrsnGrp/NameOfInterested/BusinessName/BusinessNameLine1Txt | 0 | The University of Arizona |
| IRS990ScheduleL/BusTrInvolveInterestedPrsnGrp/RelationshipDescriptionTxt | 0 | Founding Member of the Organization (Operations Support Agreement) |
| IRS990ScheduleL/BusTrInvolveInterestedPrsnGrp/SharingOfRevenuesInd | 0 | 0 |
| IRS990ScheduleL/BusTrInvolveInterestedPrsnGrp/TransactionAmt | 0 | 9290545 |
| IRS990ScheduleL/BusTrInvolveInterestedPrsnGrp/TransactionDesc | 0 | Quarterly payments for salary, equipment and supply charges to UA accounts. |
| IRS990/ScheduleORequiredInd | 0 | 1 |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 0 | The Organization is supported by members which have agreed to continue to support the telescope program through member contributions proportionate to their membership levels. The members are allocated time for telescope use proportionate to their contributions made through both cash and non-cash payments. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 1 | Members of the Organization appoint members to the Board of Directors. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 2 | Amendments of the Articles of Incorporation require unanimous approval of members. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 3 | Contemporaneous documentation is taken at Governing Body meetings. However, documentation is not taken at Committee meetings. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 4 | The Business Manager will conduct an initial review of the Form 990. The Finance committee then reviews the Form 990 on behalf of the Board of Directors. Upon approval of the Finance Committee, the Board is notified that the Form 990 is available on-line and the President is authorized to sign the Form 990 for submission to the IRS. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 5 | The Corporate Secretary distributes annual Conflict of Interest forms to all directors, officers, member representatives, voting members of the Board Finance Committee, members of the Board Scientific Advisory Committee, the Observatory director and business manager. By signing the forms and returning them to the Secretary, these people affirm that they have read and understand the Conflict of Interest policy of the LBT Corporation and have disclosed any possible conflicts. The Secretary reviews the forms for any disclosures and keeps them with the corporate records. Any disclosed conflicts are referred to the Board for their information. Any further action concerning disclosed conflicts or possible conflicts are handled according to the procedures contained in the LBT Corporation Conflict of Interest policy. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 6 | Only one director receives a fee for service on the Board. That fee was set after review by the independent directors of the Corporation in consultation with the Corporation's audit and tax advisors. It was increased by the Board to $30,000 in April 2024. The first payment was $5,000 based on the previous compensation of $20,000, and the remaining three payments were $7,500 each, totaling $27,500 for 2024. The salary of the Observatory Director, and all other employees, is set by the University of Arizona pursuant to an operational support agreement with the LBT Corporation. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 7 | The governing documents and financial statements are available upon request. |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 0 | Form 990, Part VI, Section A, line 6 |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 1 | Form 990, Part VI, Section A, line 7a |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 2 | Form 990, Part VI, Section A, line 7b |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 3 | Form 990, Part VI, Section A, line 8b |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 4 | Form 990, Part VI, Section B, line 11b |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 5 | Form 990, Part VI, Section B, line 12c |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 6 | Form 990, Part VI, Section B, line 15b |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 7 | Form 990, Part VI, Section C, line 19 |
| IRS990/SchoolOperatingInd | 0 | 0 |
| IRS990/SignificantChangeInd | 0 | 0 |
| IRS990/SignificantNewProgramSrvcInd | 0 | 0 |
| IRS990/SubjectToExcsTaxNetInvstIncInd | 0 | 0 |
| IRS990/SubjectToProxyTaxInd | 0 | 0 |
| IRS990/SubjToTaxRmnrtnExPrchtPymtInd | 0 | 0 |
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