Liabilities / Assets
21st percentile
Higher debt load relative to assets than 21% of similar nonprofits.
EIN 04-2164402 • 501(c)3 • Cambridge, MA
Profile
To enable anyone, anywhere, to participate in scientific discovery through variable star astronomy.
Precomputed percentiles relative to similar nonprofits. These scores are descriptive rather than judgmental.
Liabilities / Assets
21st percentile
Higher debt load relative to assets than 21% of similar nonprofits.
Liabilities / Revenue
62nd percentile
Higher debt load relative to revenue than 62% of similar nonprofits.
Net Margin
15th percentile
Higher net margin than 15% of similar nonprofits.
Top Officer Pay
55th percentile
Higher top officer pay than 55% of similar nonprofits.
Top officer pay equals 18.8% of source-year revenue.
Asset Growth
81st percentile
Faster asset growth than 81% of similar nonprofits.
Revenue Growth
86th percentile
Faster revenue growth than 86% of similar nonprofits.
Assets
Up$19,079,368
Up $2,991,340 (+19%) from 2023
Liabilities
Down$385,998
Down $34,025 (-8.1%) from 2023
Net Assets
Up$18,693,370
Up $3,025,365 (+19%) from 2023
Revenue
Up$1,074,729
Up $383,035 (+55%) from 2023
Expenses
Up$1,216,226
Up $21,243 (+1.8%) from 2023
Net Income
Up-$141,497
Up $361,792 (+72%) from 2023
Most recent year
2024 • Form 990Detailed filing. Detailed filing data is available for this year.
To promote, collaborate in and, facilitate the sharing of information relating to variable type star astronomical observation, research and data collection
To enable anyone, anywhere, to participate in scientific discovery through variable star astronomy.
| Line | Beginning | End | Change |
|---|---|---|---|
| Assets | |||
| Investments in Publicly Traded Securities | $14,704,292 | $17,896,382 | ▲ $3,192,090 |
| Savings and Temporary Cash Investments | $932,379 | $810,395 | ▼ $121,984 |
| Cash and Non-Interest-Bearing Accounts | $120,708 | $109,962 | ▼ $10,746 |
| Prepaid Expenses and Deferred Charges | $14,064 | $22,234 | ▲ $8,170 |
| Land, Buildings, and Equipment, Net | $27,590 | $21,685 | ▼ $5,905 |
| Total Assets | $16,088,028 | $19,079,368 | ▲ $2,991,340 |
| Other Assets Total | $288,995 | $218,710 | ▼ $70,285 |
| Liabilities | |||
| Other Liabilities | $281,645 | $213,039 | ▼ $68,606 |
| Accounts Payable and Accrued Expenses | $58,052 | $91,422 | ▲ $33,370 |
| Deferred Revenue | $80,326 | $81,537 | ▲ $1,211 |
| Total Liabilities | $420,023 | $385,998 | ▼ $34,025 |
| Net Assets / Fund Balance | |||
| Net Assets Without Donor Restrictions | $12,085,730 | $15,038,831 | ▲ $2,953,101 |
| Net Assets With Donor Restrictions | $3,582,275 | $3,654,539 | ▲ $72,264 |
| Total Net Assets Fund Balance | $15,668,005 | $18,693,370 | ▲ $3,025,365 |
| Total Liabilities and Net Assets / Fund Balance | $16,088,028 | $19,079,368 | ▲ $2,991,340 |
| Asset | Book Value | Depreciation | Basis |
|---|---|---|---|
| Equipment | $13,028 | $117,672 | $130,700 |
| Other Land Buildings | $8,657 | $8,677 | $17,334 |
| Period | Beginning | Contrib. | Gain/Loss | Other Uses | End |
|---|---|---|---|---|---|
| 2023 | $15,282,474 | $14,300 | ▲ $3,841,741 | $732,566 | $18,405,949 |
| 2022 | $14,226,892 | - | ▲ $1,746,958 | $691,376 | $15,282,474 |
| 2021 | $14,368,646 | $3,082,306 | ▼ $2,574,619 | $649,441 | $14,226,892 |
| 2020 | $12,248,049 | $12,540 | ▲ $2,744,637 | $636,580 | $14,368,646 |
| 2019 | $13,199,403 | $24,023 | ▼ $231,328 | $744,049 | $12,248,049 |
| Name | Title | Full / Part Time | Base | Other | Total |
|---|---|---|---|---|---|
| Dr Brian Kloppenborg | Executive Director | FT | $172,132 | $29,663 | $201,795 |
| Name | Title |
|---|---|
| David Cowall | Past President |
| Richard Berry | President |
| Dennis Conti | 2nd Vice President |
| Sarah Austrin Willis | Vice President |
| Arne Hendon | Director |
| Diogo Teixeira | Director |
| Eric Hintz | Director |
| Mark Munkacsy | Director |
| Matt Craig | Director |
| Pat Boyce | Director |
| Peter Bealo | Director |
| Thomas Maccarone | Director |
| Walt Cooney | Director |
| Kris Larsen | Secretary |
| Robert Stephens | Treasurer |
| Line Item | Amount |
|---|---|
| Salaries, Compensation, and Employee Benefits | $754,418 |
| Other Expenses | $461,808 |
| Total Fundraising Expense | $64,566 |
| Grants and Similar Amounts Paid | $0 |
| Professional Fundraising Fees | $0 |
| Line Item | Program | Management | Fundraising | Total |
|---|---|---|---|---|
| Other Salaries and Wages | $261,212 | $126,627 | $24,443 | $412,282 |
| Current Officers, Directors, Trustees, and Key Employees | $135,717 | $71,425 | $12,730 | $219,872 |
| Occupancy | $56,513 | $28,857 | $5,326 | $90,696 |
| Conferences and Meetings | $76,942 | $4,230 | $7,542 | $88,714 |
| Fees for Service Investment Mgmnt Fees | - | $55,681 | - | $55,681 |
| Fees for Services Other | $46,122 | $7,415 | $184 | $53,721 |
| Other Employee Benefits | $18,029 | $30,932 | $1,797 | $50,758 |
| Information Technology | $20,872 | $26,705 | $2,293 | $49,870 |
| Payroll Taxes | $30,208 | $14,644 | $2,827 | $47,679 |
| Fees for Services Accounting | $15,747 | $11,386 | $1,798 | $28,931 |
| Pension Plan Contributions | $16,199 | $6,115 | $1,513 | $23,827 |
| Office Expenses | $8,875 | $5,385 | $819 | $15,079 |
| Travel | $11,482 | $631 | $1,125 | $13,238 |
| Insurance | $5,191 | $5,160 | $515 | $10,866 |
| Depreciation Depletion | $3,129 | $6,127 | $258 | $9,514 |
| Advertising | $7,742 | $-614 | $334 | $7,462 |
| Fees for Services Legal | $2,025 | $1,464 | $231 | $3,720 |
| Other Expenses | $2,319 | $1,162 | $219 | $3,700 |
| Total Functional Expenses | $743,500 | $408,160 | $64,566 | $1,216,226 |
| Line Item | Amount |
|---|---|
| Total Expenses per Form 990 | $1,216,226 |
| Total Expenses per Audited Statements | $1,173,489 |
| Expenses per Audited Statements | $1,160,545 |
| Expenses Not Reported on Financial Statements | $55,681 |
| Expenses Not Reported on Form 990 | $12,944 |
| Line Item | Amount |
|---|---|
| Professional Fundraising Fees | $0 |
| Liability | Amount |
|---|---|
| Operating Lease Liabilities | $213,039 |
“There shall be three classes of membership in the association: members, honorary members and organizational members. The eligibility requirements and rights of each class of members shall be as follows: members: any individual who is interested in the advancement of variable star work and kindred subjects shall be eligible to become a member. Upon application and payment of dues, in such amounts as shall be determined by the board of directors from time to time, such persons shall become members. Members shall pay annual dues, may serve as officers or directors of the association, and are entitled to vote on association affairs. Honorary members: the board of directors may elect any individual as an honorary member in recognition of such individual's distinguished contribution to astronomy. The secretary shall notify such individual of his/her eligibility to become an honorary member and he/she shall become so upon notifying the secretary of acceptance. Honorary members shall not be liable for the payment of dues and shall not be eligible to serve as an officer of the association, but may serve on the board of directors and may vote on association affairs. Organizational members: corporations and other entities desirous of encouraging the work of the association may become organizational members. Organizational members do not pay dues, may not hold office or serve on the board of directors, and are not entitled to vote on association affairs.”
“Members elect annually three board members, who have three year terms.”
“Amendments to the bylaws, dissolution of the organization”
“The financial statements and tax returns will be reviewed by the executive committe prior to approval. In the past the practice has been to go through it line-by-line.”
“Circumstances have been rare where potential conflicts could arise because the commercial engagement policy is very restrictive on how we can interact with equipment vendors. Those restrictions were slightly loosened with an update to the policy in may 2025. Board members required to sign conflict of interest policy annually.”
“Other officers not compensated. Key employees other than executive director have compensation determined by the executive director after the overall budget for compensation has been approved by the board.”
“The bylaws are available on the website. Other documents such as the conflict of interest policy are stored on google drive and made available to board members and officers.”
“The association is exempt from federal income taxes as an organization formed for charitable purposes under section 501(c)(3) of the internal revenue code ("irc"). The association is also exempt from state income taxes. Donors may deduct contributions made to the association within the irs requirements. The association's income tax filings are subject to audit by various taxing authorities. The association's open audit periods are 2021 - 2024.”
This appendix keeps the raw XML leaves available for debugging and edge-case review. The human report above is the primary experience.
| Path | # | Value |
|---|---|---|
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| IRS990/AccountsPayableAccrExpnssGrp/BOYAmt | 0 | 58052 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 91422 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | 0 |
| IRS990/ActivityOrMissionDesc | 0 | TO ENABLE ANYONE, ANYWHERE, TO PARTICIPATE IN SCIENTIFIC DISCOVERY THROUGH VARIABLE STAR ASTRONOMY. |
| IRS990/AdvertisingGrp/FundraisingAmt | 0 | 334 |
| IRS990/AdvertisingGrp/ManagementAndGeneralAmt | 0 | -614 |
| IRS990/AdvertisingGrp/ProgramServicesAmt | 0 | 7742 |
| IRS990/AdvertisingGrp/TotalAmt | 0 | 7462 |
| IRS990/AllOtherContributionsAmt | 0 | 188109 |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | 1 |
| IRS990/AuditCommitteeInd | 0 | 1 |
| IRS990/BackupWthldComplianceInd | 0 | 1 |
| IRS990/BooksInCareOfDetail/BusinessName/BusinessNameLine1Txt | 0 | BRIAN KLOPPENBORG |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 6173540484 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 185 ALEWIFE BROOK PARKWAY |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | CAMBRIDGE |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | MA |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 02138 |
| IRS990/BusinessRlnWith35CtrlEntInd | 0 | 0 |
| IRS990/BusinessRlnWithFamMemInd | 0 | 0 |
| IRS990/BusinessRlnWithOrgMemInd | 0 | 0 |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 120708 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 109962 |
| IRS990/ChangeToOrgDocumentsInd | 0 | 0 |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 0 |
| IRS990/CollectionsOfArtInd | 0 | 0 |
| IRS990/CompCurrentOfcrDirectorsGrp/FundraisingAmt | 0 | 12730 |
| IRS990/CompCurrentOfcrDirectorsGrp/ManagementAndGeneralAmt | 0 | 71425 |
| IRS990/CompCurrentOfcrDirectorsGrp/ProgramServicesAmt | 0 | 135717 |
| IRS990/CompCurrentOfcrDirectorsGrp/TotalAmt | 0 | 219872 |
| IRS990/CompensationFromOtherSrcsInd | 0 | 0 |
| IRS990/CompensationProcessCEOInd | 0 | 1 |
| IRS990/CompensationProcessOtherInd | 0 | 0 |
| IRS990/ConferencesMeetingsGrp/FundraisingAmt | 0 | 7542 |
| IRS990/ConferencesMeetingsGrp/ManagementAndGeneralAmt | 0 | 4230 |
| IRS990/ConferencesMeetingsGrp/ProgramServicesAmt | 0 | 76942 |
| IRS990/ConferencesMeetingsGrp/TotalAmt | 0 | 88714 |
| IRS990/ConflictOfInterestPolicyInd | 0 | 1 |
| IRS990/ConservationEasementsInd | 0 | 0 |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | 0 |
| IRS990/CreditCounselingInd | 0 | 0 |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 188109 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/CYInvestmentIncomeAmt | 0 | 730591 |
| IRS990/CYOtherExpensesAmt | 0 | 461808 |
| IRS990/CYOtherRevenueAmt | 0 | 0 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 156029 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | -141497 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 754418 |
| IRS990/CYTotalExpensesAmt | 0 | 1216226 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 64566 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 1074729 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | 1 |
| IRS990/DeductibleArtContributionInd | 0 | 0 |
| IRS990/DeductibleNonCashContriInd | 0 | 0 |
| IRS990/DeferredRevenueGrp/BOYAmt | 0 | 80326 |
| IRS990/DeferredRevenueGrp/EOYAmt | 0 | 81537 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | 0 |
| IRS990/DepreciationDepletionGrp/FundraisingAmt | 0 | 258 |
| IRS990/DepreciationDepletionGrp/ManagementAndGeneralAmt | 0 | 6127 |
| IRS990/DepreciationDepletionGrp/ProgramServicesAmt | 0 | 3129 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 9514 |
| IRS990/Desc | 0 | THE AAVSO, THROUGH ITS MEMBERS AND THE BROADER ASTRONOMICAL COMMUNITY, CONDUCTS ASTRONOMICAL RESEARCH, DOES DATA COLLECTION, MAINTAINS A DATABASE OF KNOWN VARIABLE STARS, A DATABASE OF INDIVIDUAL OBSERVATIONS MEASURING BRIGHT OF STARS IN VARIOUS COLORS, A DATABASE OF EXOPLANET OBSERVATIONS, A DATABASE OF SUNSPOT COUNTS, AND A DATABASE OF SPECTROGRAPHS. THE AAVSO HAS ABOUT 1,400 MEMBERS, THE MAJORITY OF WHICH CONTRIBUTE ASTRONOMICAL OBSERVATIONS. THE VARIABLE STAR DATABASE HAS 2 MILLION KNOWN VARIABLE STARS. THERE ARE ABOUT 65 MILLION BRIGHTNESS OBSERVATIONS, 8 THOUSAND EXO-PLANET TRANSITS, 15 THOUSAND SPECTRA, AND 181 THOUSAND SOLAR OBSERVATIONS. THE AAVSO ORGANIZES OBSERVING CAMPAIGNS OR PROVIDES A PLATFORM FOR PROFESSIONAL ASTRONOMERS TO REQUEST MONITORING OF STARS FOR SPACECRAFT MISSIONS. |
| IRS990/DescribedInSection501c3Ind | 0 | 1 |
| IRS990/DisregardedEntityInd | 0 | 0 |
| IRS990/DocumentRetentionPolicyInd | 0 | 1 |
| IRS990/DonorAdvisedFundInd | 0 | 0 |
| IRS990/DonorRestrictionNetAssetsGrp/BOYAmt | 0 | 3582275 |
| IRS990/DonorRestrictionNetAssetsGrp/EOYAmt | 0 | 3654539 |
| IRS990/DonorRstrOrQuasiEndowmentsInd | 0 | 1 |
| IRS990/ElectionOfBoardMembersInd | 0 | 1 |
| IRS990/EmployeeCnt | 0 | 7 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | 1 |
| IRS990/EngagedInExcessBenefitTransInd | 0 | 0 |
| IRS990/ExpenseAmt | 0 | 552477 |
| IRS990/FamilyOrBusinessRlnInd | 0 | 0 |
| IRS990/FederalGrantAuditRequiredInd | 0 | 0 |
| IRS990/FeesForServicesAccountingGrp/FundraisingAmt | 0 | 1798 |
| IRS990/FeesForServicesAccountingGrp/ManagementAndGeneralAmt | 0 | 11386 |
| IRS990/FeesForServicesAccountingGrp/ProgramServicesAmt | 0 | 15747 |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 28931 |
| IRS990/FeesForServicesLegalGrp/FundraisingAmt | 0 | 231 |
| IRS990/FeesForServicesLegalGrp/ManagementAndGeneralAmt | 0 | 1464 |
| IRS990/FeesForServicesLegalGrp/ProgramServicesAmt | 0 | 2025 |
| IRS990/FeesForServicesLegalGrp/TotalAmt | 0 | 3720 |
| IRS990/FeesForServicesOtherGrp/FundraisingAmt | 0 | 184 |
| IRS990/FeesForServicesOtherGrp/ManagementAndGeneralAmt | 0 | 7415 |
| IRS990/FeesForServicesOtherGrp/ProgramServicesAmt | 0 | 46122 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 53721 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/ManagementAndGeneralAmt | 0 | 55681 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/TotalAmt | 0 | 55681 |
| IRS990/ForeignActivitiesInd | 0 | 0 |
| IRS990/ForeignFinancialAccountInd | 0 | 0 |
| IRS990/ForeignOfficeInd | 0 | 0 |
| IRS990/Form8282PropertyDisposedOfInd | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 35.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 1 | 6.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 2 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 3 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 4 | 3.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 5 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 6 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 7 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 8 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 9 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 10 | 3.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 11 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 12 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 13 | 3.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 14 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 15 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 0 | X |
| 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 |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 6 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 7 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 8 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 9 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 10 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 11 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 12 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 13 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 14 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 15 | X |
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| IRS990/Form990PartVIISectionAGrp/OfficerInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 4 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 5 | X |
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| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 10 | 0 |
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| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | SARAH AUSTRIN WILLIS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | DENNIS CONTI |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | ROBERT STEPHENS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | KRIS LARSEN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | DAVID COWALL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | DIOGO TEIXEIRA |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | ERIC HINTZ |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | THOMAS MACCARONE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | PETER BEALO |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | PAT BOYCE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 12 | ARNE HENDON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 13 | WALT COONEY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 14 | MARK MUNKACSY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 15 | MATT CRAIG |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 0 | 182132 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 4 | 0 |
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| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 12 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 13 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 14 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 15 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 12 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 13 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 14 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 15 | 0 |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 0 | EXECUTIVE DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | VICE PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | 2ND VICE PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | TREASURER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | SECRETARY |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | PAST PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 11 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 12 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 13 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 14 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 15 | DIRECTOR |
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| IRS990/FormationYr | 0 | 1911 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | 0 |
| IRS990/FSAuditedBasisGrp/SeparateBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | 1 |
| IRS990/FundraisingActivitiesInd | 0 | 0 |
| IRS990/GainOrLossGrp/SecuritiesAmt | 0 | 310534 |
| IRS990/GamingActivitiesInd | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 15 |
| IRS990/GrantsToIndividualsInd | 0 | 0 |
| IRS990/GrantsToOrganizationsInd | 0 | 0 |
| IRS990/GrantToRelatedPersonInd | 0 | 0 |
| IRS990/GrossAmountSalesAssetsGrp/SecuritiesAmt | 0 | 6417083 |
| IRS990/GrossReceiptsAmt | 0 | 7181278 |
| IRS990/GroupReturnForAffiliatesInd | 0 | 0 |
| IRS990/IncludeFIN48FootnoteInd | 0 | 1 |
| IRS990/IndependentAuditFinclStmtInd | 0 | 1 |
| IRS990/IndependentVotingMemberCnt | 0 | 14 |
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| IRS990/IndoorTanningServicesInd | 0 | 0 |
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| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InformationTechnologyGrp/FundraisingAmt | 0 | 2293 |
| IRS990/InformationTechnologyGrp/ManagementAndGeneralAmt | 0 | 26705 |
| IRS990/InformationTechnologyGrp/ProgramServicesAmt | 0 | 20872 |
| IRS990/InformationTechnologyGrp/TotalAmt | 0 | 49870 |
| IRS990/InsuranceGrp/FundraisingAmt | 0 | 515 |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 5160 |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 5191 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 10866 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 420057 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 420057 |
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| IRS990/InvestmentsPubTradedSecGrp/BOYAmt | 0 | 14704292 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 17896382 |
| IRS990/IRPDocumentCnt | 0 | 6 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 126349 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 27590 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 21685 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 148034 |
| IRS990/LegalDomicileStateCd | 0 | MA |
| IRS990/LessCostOthBasisSalesExpnssGrp/SecuritiesAmt | 0 | 6106549 |
| 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 | 1 |
| IRS990/MinutesOfGoverningBodyInd | 0 | 1 |
| IRS990/MissionDesc | 0 | THE AAVSO PROVIDES AMATEUR ASTRONOMERS AND STUDENTS THE OPPORTUNITY TO MAKE REAL AND DIRECT CONTRIBUTIONS TO ASTRONOMY. IN PROGRAMS THEY COMPLETE AT THEIR OWN PACE, WE TEACH THEM HOW TO MAKE OBSERVATIONS AND HOW TO ANALYZE ASTRONOMICAL DATA, AND WE OFFER THEM THE OPPORTUNITY TO PARTICIPATE IN OBSERVING CAMPAIGNS DESIGNED TO PRODUCE PEER-REVIEWED PUBLISHED PAPERS. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | 0 |
| IRS990/MoreThan5000KToOrgInd | 0 | 0 |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 15668005 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 18693370 |
| IRS990/NetGainOrLossInvestmentsGrp/ExclusionAmt | 0 | 310534 |
| IRS990/NetGainOrLossInvestmentsGrp/TotalRevenueColumnAmt | 0 | 310534 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 0 |
| IRS990/NetUnrlzdGainsLossesInvstAmt | 0 | 3166862 |
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| IRS990/NoDonorRestrictionNetAssetsGrp/EOYAmt | 0 | 15038831 |
| IRS990/NondeductibleContributionsInd | 0 | 0 |
| IRS990/OccupancyGrp/FundraisingAmt | 0 | 5326 |
| IRS990/OccupancyGrp/ManagementAndGeneralAmt | 0 | 28857 |
| IRS990/OccupancyGrp/ProgramServicesAmt | 0 | 56513 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 90696 |
| IRS990/OfficeExpensesGrp/FundraisingAmt | 0 | 819 |
| IRS990/OfficeExpensesGrp/ManagementAndGeneralAmt | 0 | 5385 |
| IRS990/OfficeExpensesGrp/ProgramServicesAmt | 0 | 8875 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 15079 |
| IRS990/OfficerMailingAddressInd | 0 | 0 |
| IRS990/OperateHospitalInd | 0 | 0 |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsFASB117Ind | 0 | X |
| IRS990/OtherAssetsTotalGrp/BOYAmt | 0 | 288995 |
| IRS990/OtherAssetsTotalGrp/EOYAmt | 0 | 218710 |
| IRS990/OtherChangesInNetAssetsAmt | 0 | 0 |
| IRS990/OtherEmployeeBenefitsGrp/FundraisingAmt | 0 | 1797 |
| IRS990/OtherEmployeeBenefitsGrp/ManagementAndGeneralAmt | 0 | 30932 |
| IRS990/OtherEmployeeBenefitsGrp/ProgramServicesAmt | 0 | 18029 |
| IRS990/OtherEmployeeBenefitsGrp/TotalAmt | 0 | 50758 |
| IRS990/OtherExpensesGrp/Desc | 0 | TELESCOPE SUPPLIES |
| IRS990/OtherExpensesGrp/Desc | 1 | DUES & SUBSCRIPTIONS |
| IRS990/OtherExpensesGrp/Desc | 2 | REPAIRS AND MAINTENANCE |
| IRS990/OtherExpensesGrp/FundraisingAmt | 0 | 612 |
| IRS990/OtherExpensesGrp/FundraisingAmt | 1 | 219 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 0 | 4828 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 1 | 1162 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 18502 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 1 | 6674 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 2 | 2319 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 18502 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 12114 |
| IRS990/OtherExpensesGrp/TotalAmt | 2 | 3700 |
| IRS990/OtherLiabilitiesGrp/BOYAmt | 0 | 281645 |
| IRS990/OtherLiabilitiesGrp/EOYAmt | 0 | 213039 |
| IRS990/OtherSalariesAndWagesGrp/FundraisingAmt | 0 | 24443 |
| IRS990/OtherSalariesAndWagesGrp/ManagementAndGeneralAmt | 0 | 126627 |
| IRS990/OtherSalariesAndWagesGrp/ProgramServicesAmt | 0 | 261212 |
| IRS990/OtherSalariesAndWagesGrp/TotalAmt | 0 | 412282 |
| IRS990/OwnWebsiteInd | 0 | X |
| IRS990/PartialLiquidationInd | 0 | 0 |
| IRS990/PayrollTaxesGrp/FundraisingAmt | 0 | 2827 |
| IRS990/PayrollTaxesGrp/ManagementAndGeneralAmt | 0 | 14644 |
| IRS990/PayrollTaxesGrp/ProgramServicesAmt | 0 | 30208 |
| IRS990/PayrollTaxesGrp/TotalAmt | 0 | 47679 |
| IRS990/PensionPlanContributionsGrp/FundraisingAmt | 0 | 1513 |
| IRS990/PensionPlanContributionsGrp/ManagementAndGeneralAmt | 0 | 6115 |
| IRS990/PensionPlanContributionsGrp/ProgramServicesAmt | 0 | 16199 |
| IRS990/PensionPlanContributionsGrp/TotalAmt | 0 | 23827 |
| IRS990/PoliticalCampaignActyInd | 0 | 0 |
| IRS990/PrepaidExpensesDefrdChargesGrp/BOYAmt | 0 | 14064 |
| IRS990/PrepaidExpensesDefrdChargesGrp/EOYAmt | 0 | 22234 |
| IRS990/PrincipalOfficerNm | 0 | BRIAN KLOPPENBORG |
| IRS990/ProfessionalFundraisingInd | 0 | 0 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 0 | 900099 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 1 | 541700 |
| IRS990/ProgramServiceRevenueGrp/Desc | 0 | MEMBERSHIP DUES |
| IRS990/ProgramServiceRevenueGrp/Desc | 1 | MEETINGS AND SYMPOSIUM |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 102472 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 1 | 53557 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 0 | 102472 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 1 | 53557 |
| IRS990/ProgSrvcAccomActy2Grp/Desc | 0 | THE AAVSO HOLDS AN ANNUAL SCIENCE AND MEMBERSHIP MEETING EACH FALL. THE MEETING ROTATES THROUGHOUT THE COUNTRY TO GIVE MEMBERS A BETTER CHANCE TO PARTICIPATE. EACH MEETING HAS ABOUT 75 IN-PERSON PARTICIPANTS AND AN ADDITIONAL 25-50 ONLINE MEMBERS. THE MEETINGS ARE OFTEN HELD IN CONJUNCTION WITH A SPECIAL INTEREST WORKSHOP BEFORE OR AFTER THE MEETING. THE MEETING WILL HAVE 1-1/2 DAYS OF SCIENCE TALKS, INCLUDING RESEARCH PRESENTATION BY MEMBERS. THERE IS ALSO A RECEPTION, FINAL DINNER, AND A HALF DAY MEMBERSHIP MEETING WHERE FINANCIAL AND OPERATIONAL RESULTS ARE PRESENTED, AWARDS PRESENTED. AND THE INCOMING BOARD OF DIRECTORS IS VOTED UPON. |
| IRS990/ProgSrvcAccomActy2Grp/ExpenseAmt | 0 | 119800 |
| IRS990/ProgSrvcAccomActy2Grp/RevenueAmt | 0 | 40111 |
| IRS990/ProgSrvcAccomActy3Grp/Desc | 0 | THE AAVSO PROVIDES A NUMBER OF EDUCATIONAL COURSES, WEBINARS, MENTORING, ARTICLES, BLOG POSTS, AND OTHER COMMUNICATIONS. WE OPERATE AN ONLINE FORUM ON A NUMBER OF OBSERVING AND EQUIPMENT TOPICS. WE OPERATE A MENTORING PROGRAM FOR NEW OBSERVERS WHERE AN EXPERIENCED OBSERVER COACHES THEM. WE RECEIVE ABOUT 30 MENTORING REQUESTS PER YEAR. WE ALSO PROVIDE CHOICE COURSES, A MULTI-DAY EDUCATIONAL COURSE WHICH HAS ABOUT 100 PARTICIPANTS PER YEAR. EACH MONTH WE PROVIDE ZOOM WEBINARS ON VARIOUS SUBJECTS WHICH HAS ABOUT 2,000 PARTICIPANTS EACH YEAR. WE ALSO POST WEBINARS TO OUR YOUTUBE CHANNEL GETTING OVER 8,000 VIEWS. WE ALSO POST ARTICLES TO VARIOUS SOCIAL MEDIA SITES AND ARE A RESOURCE FOR THE NEWS MEDIA CONCERNING STAR RESEARCH. |
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| IRS990/ProgSrvcAccomActy3Grp/RevenueAmt | 0 | 13446 |
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| IRS990/PYContributionsGrantsAmt | 0 | 185936 |
| IRS990/PYExcessBenefitTransInd | 0 | 0 |
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| IRS990/PYInvestmentIncomeAmt | 0 | 390470 |
| IRS990/PYOtherExpensesAmt | 0 | 500882 |
| IRS990/PYOtherRevenueAmt | 0 | 0 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 115288 |
| IRS990/PYRevenuesLessExpensesAmt | 0 | -503289 |
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| IRS990/PYTotalExpensesAmt | 0 | 1194983 |
| IRS990/PYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/PYTotalRevenueAmt | 0 | 691694 |
| IRS990/QuidProQuoContributionsInd | 0 | 0 |
| IRS990/ReconcilationRevenueExpnssAmt | 0 | -141497 |
| 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 | 102472 |
| IRS990/SavingsAndTempCashInvstGrp/BOYAmt | 0 | 932379 |
| IRS990/SavingsAndTempCashInvstGrp/EOYAmt | 0 | 810395 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearAmt | 0 | 188109 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus1YearAmt | 0 | 185936 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 329791 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 563165 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 194848 |
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| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 151049 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 298461 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 413652 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/TotalAmt | 0 | 1686887 |
| IRS990ScheduleA/GrossReceiptsRltdActivitiesAmt | 0 | 311776 |
| IRS990ScheduleA/PublicOrganization170Ind | 0 | X |
| IRS990ScheduleA/PublicSupportCY170Pct | 0 | 0.46430 |
| IRS990ScheduleA/PublicSupportPY170Pct | 0 | 0.43340 |
| IRS990ScheduleA/PublicSupportTotal170Amt | 0 | 1461849 |
| IRS990ScheduleA/ThirtyThrPctSuprtTestsCY170Ind | 0 | X |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearAmt | 0 | 188109 |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus1YearAmt | 0 | 185936 |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 329791 |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 563165 |
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| IRS990ScheduleA/TotalSupportAmt | 0 | 3148736 |
| IRS990ScheduleB/ContributorInformationGrp/ContributorBusinessName/BusinessNameLine1 | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorNum | 0 | RESTRICTED |
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