Civic Intelligence

American Association of Variable Star

EIN 04-2164402 • 501(c)3 • Cambridge, MA

Profile

To enable anyone, anywhere, to participate in scientific discovery through variable star astronomy.

185 Alewife Brook Parkway 410Cambridge, MA 02138

www.aavso.org

Siviq Scores

Precomputed percentiles relative to similar nonprofits. These scores are descriptive rather than judgmental.

Liabilities / Assets

21st percentile

0.02x

Higher debt load relative to assets than 21% of similar nonprofits.

501(c)3 • $10M-$25M nonprofits • Source year 2024

Liabilities / Revenue

62nd percentile

0.36x

Higher debt load relative to revenue than 62% of similar nonprofits.

501(c)3 • $10M-$25M nonprofits • Source year 2024

Net Margin

15th percentile

-13%

Higher net margin than 15% of similar nonprofits.

501(c)3 • $10M-$25M nonprofits • Source year 2024

Top Officer Pay

55th percentile

$201,795

Higher top officer pay than 55% of similar nonprofits.

Top officer pay equals 18.8% of source-year revenue.

501(c)3 • $10M-$25M nonprofits • Source year 2024

Asset Growth

81st percentile

19%

Faster asset growth than 81% of similar nonprofits.

501(c)3 • $10M-$25M nonprofits • Annualized from 2023 to 2024

Revenue Growth

86th percentile

55%

Faster revenue growth than 86% of similar nonprofits.

501(c)3 • $10M-$25M nonprofits • Annualized from 2023 to 2024

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

Trend Graphs

Balance Sheet Trend

Grouped bars show assets, liabilities, and net assets across loaded filings.

$20M$15M$10M$5.0M$0Assets 2011: $13,302,521Liabilities 2011: $45,108Net Assets 2011: $13,257,4132011Assets 2012: $14,188,493Liabilities 2012: $66,448Net Assets 2012: $14,122,0452012Assets 2013: $14,732,230Liabilities 2013: $37,742Net Assets 2013: $14,694,4882013Assets 2014: $15,043,042Liabilities 2014: $35,769Net Assets 2014: $15,007,2732014Assets 2015: $13,796,249Liabilities 2015: $49,049Net Assets 2015: $13,747,2002015Assets 2016: $14,054,919Liabilities 2016: $66,203Net Assets 2016: $13,988,7162016Assets 2017: $14,959,492Liabilities 2017: $62,287Net Assets 2017: $14,897,2052017Assets 2018: $14,973,026Liabilities 2018: $107,390Net Assets 2018: $14,865,6362018Assets 2019: $14,622,983Liabilities 2019: $76,699Net Assets 2019: $14,546,2842019Assets 2020: $13,708,362Liabilities 2020: $119,879Net Assets 2020: $13,588,4832020Assets 2021: $16,117,198Liabilities 2021: $112,886Net Assets 2021: $16,004,3122021Assets 2022: $15,233,992Liabilities 2022: $464,913Net Assets 2022: $14,769,0792022Assets 2023: $16,088,028Liabilities 2023: $420,023Net Assets 2023: $15,668,0052023Assets 2024: $19,079,368Liabilities 2024: $385,998Net Assets 2024: $18,693,3702024

Highlighted filing

2024

Assets$19,079,368
Liabilities$385,998
Net Assets$18,693,370

Operations Trend

Revenue, expenses, and net income by year, with the latest filing highlighted.

$3.0M$2.0M$1.0M$0-$1.0MRevenue 2011: $1,203,692Expenses 2011: $1,386,739Net Income 2011: -$183,0472011Expenses 2012: $1,510,8372012Revenue 2013: $2,298,760Expenses 2013: $1,484,751Net Income 2013: $814,0092013Revenue 2014: $2,990,225Expenses 2014: $1,402,796Net Income 2014: $1,587,4292014Revenue 2015: $1,320,142Expenses 2015: $1,428,723Net Income 2015: -$108,5812015Revenue 2016: $791,640Expenses 2016: $1,050,136Net Income 2016: -$258,4962016Revenue 2017: $665,724Expenses 2017: $942,993Net Income 2017: -$277,2692017Revenue 2018: $1,949,464Expenses 2018: $1,057,144Net Income 2018: $892,3202018Revenue 2019: $110,788Expenses 2019: $993,319Net Income 2019: -$882,5312019Revenue 2020: $212,157Expenses 2020: $997,617Net Income 2020: -$785,4602020Revenue 2021: $1,024,120Expenses 2021: $969,435Net Income 2021: $54,6852021Revenue 2022: $2,634,853Expenses 2022: $1,034,647Net Income 2022: $1,600,2062022Revenue 2023: $691,694Expenses 2023: $1,194,983Net Income 2023: -$503,2892023Revenue 2024: $1,074,729Expenses 2024: $1,216,226Net Income 2024: -$141,4972024

Highlighted filing

2024

Revenue$1,074,729
Expenses$1,216,226
Net Income-$141,497

Filings

Balance SheetOperations
YearAssetsLiabilitiesNet AssetsRevenueExpensesNet Income
2024Detailed filing. Detailed filing data is available for this year.$19.1$0.39$18.7$1.07$1.22$0.14
2023Detailed filing. Detailed filing data is available for this year.$16.1$0.42$15.7$0.69$1.19$0.50
2022Facts available. Structured filing facts are available, but richer extracted sections are limited.$15.2$0.46$14.8$2.63$1.03$1.60
2021Detailed filing. Detailed filing data is available for this year.$16.1$0.11$16.0$1.02$0.97$0.05
2020Detailed filing. Detailed filing data is available for this year.$13.7$0.12$13.6$0.21$1.00$0.79
2019Detailed filing. Detailed filing data is available for this year.$14.6$0.08$14.5$0.11$0.99$0.88
2018Detailed filing. Detailed filing data is available for this year.$15.0$0.11$14.9$1.95$1.06$0.89
2017Detailed filing. Detailed filing data is available for this year.$15.0$0.06$14.9$0.67$0.94$0.28
2016Detailed filing. Detailed filing data is available for this year.$14.1$0.07$14.0$0.79$1.05$0.26
2015Detailed filing. Detailed filing data is available for this year.$13.8$0.05$13.7$1.32$1.43$0.11
2014Detailed filing. Detailed filing data is available for this year.$15.0$0.04$15.0$2.99$1.40$1.59
2013Facts available. Structured filing facts are available, but richer extracted sections are limited.$14.7$0.04$14.7$2.30$1.48$0.81
2012Facts available. Structured filing facts are available, but richer extracted sections are limited.$14.2$0.07$14.1$1.51
2011Summary only. Only limited summary data is available for this year.$13.3$0.05$13.3$1.20$1.39$0.18
Latest Filing Detail
Jump To
Filing Snapshot
Filing Period
Oct 1, 2023 to Sep 30, 2024
Signed
Aug 12, 2025
Return Version
2023v6.0
Gross Receipts
$7,181,278
Mission and Program Overview

Mission

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.

Balance Sheet Detail
LineBeginningEndChange
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 Categories

AssetBook ValueDepreciationBasis
Equipment$13,028$117,672$130,700
Other Land Buildings$8,657$8,677$17,334

Endowment Activity

PeriodBeginningContrib.Gain/LossOther UsesEnd
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
Compensation and Service Providers

Employees

NameTitleFull / Part TimeBaseOtherTotal
Dr Brian KloppenborgExecutive DirectorFT$172,132$29,663$201,795

Board Members and Trustees

NameTitle
David CowallPast President
Richard BerryPresident
Dennis Conti2nd Vice President
Sarah Austrin WillisVice President
Arne HendonDirector
Diogo TeixeiraDirector
Eric HintzDirector
Mark MunkacsyDirector
Matt CraigDirector
Pat BoyceDirector
Peter BealoDirector
Thomas MaccaroneDirector
Walt CooneyDirector
Kris LarsenSecretary
Robert StephensTreasurer
Revenue and Support

Revenue Composition

Contributions and Grants
$188,109
Program Service Revenue
$156,029
Investment Income
$730,591
Other Revenue
$0
All Other Contributions
$188,109
Change in Net Assets
$-141,497

Audited Revenue Reconciliation

Revenue per Audited Statements
$1,019,048
Revenue Not Reported on Financial Statements
$55,681
Revenue Not Reported on Form 990
$3,179,806
Total Revenue per Audited Statements
$4,198,854
Total Revenue per Form 990
$1,074,729
Expenses and Functional Allocation

Major Expense Lines

Line ItemAmount
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

Functional Expense Allocation

Line ItemProgramManagementFundraisingTotal
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

Audited Expense Reconciliation

Line ItemAmount
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
Fundraising, Events, and Gaming
Fundraising activities
No
Gaming activities
No
Professional fundraiser used
No

Fundraising and Gaming Totals

Line ItemAmount
Professional Fundraising Fees$0
Political and Lobbying Activity
Political campaign activity
No
Lobbying activity
No
Subject to proxy tax
No
Debt and Bond Financing

Other Reported Liabilities

LiabilityAmount
Operating Lease Liabilities$213,039
Governance and Compliance

Governance Checklist

Compiled or reviewed by an accountant
No
Annual disclosure for covered persons
Yes
Audit committee
Yes
Backup withholding compliance
Yes
Business relationship with 35% controlled entity
No
Business relationship with family members
No
Business relationship with organization members
No
Material changes to governing documents
No
Compensation from other sources disclosed
No
CEO compensation reviewed
Yes
Other officer compensation reviewed
No
Conflict-of-interest policy
Yes
Audited financial statements prepared
No
Key decisions subject to board approval
Yes
Management duties delegated
No

Governance Explanations

Form 990, Part VI, Section A, Line 6

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.

Form 990, Part VI, Section A, Line 7A

Members elect annually three board members, who have three year terms.

Form 990, Part VI, Section A, Line 7B

Amendments to the bylaws, dissolution of the organization

Form 990, Part VI, Section B, Line 11B

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.

Form 990, Part VI, Section B, Line 12C

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.

Form 990, Part VI, Section B, Line 15A

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.

Form 990, Part VI, Section C, Line 19

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.

Filing and Contact Details

Filer

Filer Name
American Association of Variable Star Ob
EIN
04-2164402
Phone
6173540484
Address
185 ALEWIFE BROOK PARKWAY 410, CAMBRIDGE, MA 02138

Signing Officer

Name
Brian Kloppenborg
Title
Executive Director
Phone
6173540484
Signed
2025-08-12
Discuss with paid preparer
Yes

Organization Details

Principal Officer
Brian Kloppenborg
Formed
1911
Legal Domicile
Ma
Voting Board Members
15
Independent Board Members
14
Employees
7
Volunteers
800

Preparer

Firm
Doeren Mayhew
Address
305 WEST BIG BEAVER ROAD, TROY, MI 48084
Preparer
Megan Mccandlish CPA
Phone
2482443000
Supplemental Narrative

Financial Statement Notes

PART X, LINE 2:

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.

Raw XML AppendixShowing 400 of 599 raw XML fields

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/Desc0THE 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.
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IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt90
IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt100
IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt110
IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt120
IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt130
IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt140
IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt150
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IRS990/Form990PartVIISectionAGrp/PersonNm1RICHARD BERRY
IRS990/Form990PartVIISectionAGrp/PersonNm2SARAH AUSTRIN WILLIS
IRS990/Form990PartVIISectionAGrp/PersonNm3DENNIS CONTI
IRS990/Form990PartVIISectionAGrp/PersonNm4ROBERT STEPHENS
IRS990/Form990PartVIISectionAGrp/PersonNm5KRIS LARSEN
IRS990/Form990PartVIISectionAGrp/PersonNm6DAVID COWALL
IRS990/Form990PartVIISectionAGrp/PersonNm7DIOGO TEIXEIRA
IRS990/Form990PartVIISectionAGrp/PersonNm8ERIC HINTZ
IRS990/Form990PartVIISectionAGrp/PersonNm9THOMAS MACCARONE
IRS990/Form990PartVIISectionAGrp/PersonNm10PETER BEALO
IRS990/Form990PartVIISectionAGrp/PersonNm11PAT BOYCE
IRS990/Form990PartVIISectionAGrp/PersonNm12ARNE HENDON
IRS990/Form990PartVIISectionAGrp/PersonNm13WALT COONEY
IRS990/Form990PartVIISectionAGrp/PersonNm14MARK MUNKACSY
IRS990/Form990PartVIISectionAGrp/PersonNm15MATT CRAIG
IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt0182132
IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt10
IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt20
IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt30
IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt40
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IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt70
IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt80
IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt90
IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt100
IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt110
IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt120
IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt130
IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt140
IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt150
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IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt70
IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt80
IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt90
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IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt130
IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt140
IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt150
IRS990/Form990PartVIISectionAGrp/TitleTxt0EXECUTIVE DIRECTOR
IRS990/Form990PartVIISectionAGrp/TitleTxt1PRESIDENT
IRS990/Form990PartVIISectionAGrp/TitleTxt2VICE PRESIDENT
IRS990/Form990PartVIISectionAGrp/TitleTxt32ND VICE PRESIDENT
IRS990/Form990PartVIISectionAGrp/TitleTxt4TREASURER
IRS990/Form990PartVIISectionAGrp/TitleTxt5SECRETARY
IRS990/Form990PartVIISectionAGrp/TitleTxt6PAST PRESIDENT
IRS990/Form990PartVIISectionAGrp/TitleTxt7DIRECTOR
IRS990/Form990PartVIISectionAGrp/TitleTxt8DIRECTOR
IRS990/Form990PartVIISectionAGrp/TitleTxt9DIRECTOR
IRS990/Form990PartVIISectionAGrp/TitleTxt10DIRECTOR
IRS990/Form990PartVIISectionAGrp/TitleTxt11DIRECTOR
IRS990/Form990PartVIISectionAGrp/TitleTxt12DIRECTOR
IRS990/Form990PartVIISectionAGrp/TitleTxt13DIRECTOR
IRS990/Form990PartVIISectionAGrp/TitleTxt14DIRECTOR
IRS990/Form990PartVIISectionAGrp/TitleTxt15DIRECTOR
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IRS990/FormationYr01911
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IRS990/GrantsToOrganizationsInd00
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IRS990/GrossReceiptsAmt07181278
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IRS990/IncludeFIN48FootnoteInd01
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IRS990/IndivRcvdGreaterThan100KCnt01
IRS990/IndoorTanningServicesInd00
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IRS990/InformationTechnologyGrp/ManagementAndGeneralAmt026705
IRS990/InformationTechnologyGrp/ProgramServicesAmt020872
IRS990/InformationTechnologyGrp/TotalAmt049870
IRS990/InsuranceGrp/FundraisingAmt0515
IRS990/InsuranceGrp/ManagementAndGeneralAmt05160
IRS990/InsuranceGrp/ProgramServicesAmt05191
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IRS990/LobbyingActivitiesInd00
IRS990/LocalChaptersInd00
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IRS990/MembersOrStockholdersInd01
IRS990/MethodOfAccountingAccrualInd0X
IRS990/MinutesOfCommitteesInd01
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IRS990/MissionDesc0THE 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/MoreThan5000KToIndividualsInd00
IRS990/MoreThan5000KToOrgInd00
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IRS990/NetAssetsOrFundBalancesEOYAmt018693370
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IRS990/NetUnrlzdGainsLossesInvstAmt03166862
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IRS990/NoDonorRestrictionNetAssetsGrp/EOYAmt015038831
IRS990/NondeductibleContributionsInd00
IRS990/OccupancyGrp/FundraisingAmt05326
IRS990/OccupancyGrp/ManagementAndGeneralAmt028857
IRS990/OccupancyGrp/ProgramServicesAmt056513
IRS990/OccupancyGrp/TotalAmt090696
IRS990/OfficeExpensesGrp/FundraisingAmt0819
IRS990/OfficeExpensesGrp/ManagementAndGeneralAmt05385
IRS990/OfficeExpensesGrp/ProgramServicesAmt08875
IRS990/OfficeExpensesGrp/TotalAmt015079
IRS990/OfficerMailingAddressInd00
IRS990/OperateHospitalInd00
IRS990/Organization501c3Ind0X
IRS990/OrganizationFollowsFASB117Ind0X
IRS990/OtherAssetsTotalGrp/BOYAmt0288995
IRS990/OtherAssetsTotalGrp/EOYAmt0218710
IRS990/OtherChangesInNetAssetsAmt00
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IRS990/OtherEmployeeBenefitsGrp/ManagementAndGeneralAmt030932
IRS990/OtherEmployeeBenefitsGrp/ProgramServicesAmt018029
IRS990/OtherEmployeeBenefitsGrp/TotalAmt050758
IRS990/OtherExpensesGrp/Desc0TELESCOPE SUPPLIES
IRS990/OtherExpensesGrp/Desc1DUES & SUBSCRIPTIONS
IRS990/OtherExpensesGrp/Desc2REPAIRS AND MAINTENANCE
IRS990/OtherExpensesGrp/FundraisingAmt0612
IRS990/OtherExpensesGrp/FundraisingAmt1219
IRS990/OtherExpensesGrp/ManagementAndGeneralAmt04828
IRS990/OtherExpensesGrp/ManagementAndGeneralAmt11162
IRS990/OtherExpensesGrp/ProgramServicesAmt018502
IRS990/OtherExpensesGrp/ProgramServicesAmt16674
IRS990/OtherExpensesGrp/ProgramServicesAmt22319
IRS990/OtherExpensesGrp/TotalAmt018502
IRS990/OtherExpensesGrp/TotalAmt112114
IRS990/OtherExpensesGrp/TotalAmt23700
IRS990/OtherLiabilitiesGrp/BOYAmt0281645
IRS990/OtherLiabilitiesGrp/EOYAmt0213039
IRS990/OtherSalariesAndWagesGrp/FundraisingAmt024443
IRS990/OtherSalariesAndWagesGrp/ManagementAndGeneralAmt0126627
IRS990/OtherSalariesAndWagesGrp/ProgramServicesAmt0261212
IRS990/OtherSalariesAndWagesGrp/TotalAmt0412282
IRS990/OwnWebsiteInd0X
IRS990/PartialLiquidationInd00
IRS990/PayrollTaxesGrp/FundraisingAmt02827
IRS990/PayrollTaxesGrp/ManagementAndGeneralAmt014644
IRS990/PayrollTaxesGrp/ProgramServicesAmt030208
IRS990/PayrollTaxesGrp/TotalAmt047679
IRS990/PensionPlanContributionsGrp/FundraisingAmt01513
IRS990/PensionPlanContributionsGrp/ManagementAndGeneralAmt06115
IRS990/PensionPlanContributionsGrp/ProgramServicesAmt016199
IRS990/PensionPlanContributionsGrp/TotalAmt023827
IRS990/PoliticalCampaignActyInd00
IRS990/PrepaidExpensesDefrdChargesGrp/BOYAmt014064
IRS990/PrepaidExpensesDefrdChargesGrp/EOYAmt022234
IRS990/PrincipalOfficerNm0BRIAN KLOPPENBORG
IRS990/ProfessionalFundraisingInd00
IRS990/ProgramServiceRevenueGrp/BusinessCd0900099
IRS990/ProgramServiceRevenueGrp/BusinessCd1541700
IRS990/ProgramServiceRevenueGrp/Desc0MEMBERSHIP DUES
IRS990/ProgramServiceRevenueGrp/Desc1MEETINGS AND SYMPOSIUM
IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt0102472
IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt153557
IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt0102472
IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt153557
IRS990/ProgSrvcAccomActy2Grp/Desc0THE 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/ExpenseAmt0119800
IRS990/ProgSrvcAccomActy2Grp/RevenueAmt040111
IRS990/ProgSrvcAccomActy3Grp/Desc0THE 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.
IRS990/ProgSrvcAccomActy3Grp/ExpenseAmt071223
IRS990/ProgSrvcAccomActy3Grp/RevenueAmt013446
IRS990/ProhibitedTaxShelterTransInd00
IRS990/PYBenefitsPaidToMembersAmt00
IRS990/PYContributionsGrantsAmt0185936
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IRS990/PYGrantsAndSimilarPaidAmt00
IRS990/PYInvestmentIncomeAmt0390470
IRS990/PYOtherExpensesAmt0500882
IRS990/PYOtherRevenueAmt00
IRS990/PYProgramServiceRevenueAmt0115288
IRS990/PYRevenuesLessExpensesAmt0-503289
IRS990/PYSalariesCompEmpBnftPaidAmt0694101
IRS990/PYTotalExpensesAmt01194983
IRS990/PYTotalProfFndrsngExpnsAmt00
IRS990/PYTotalRevenueAmt0691694
IRS990/QuidProQuoContributionsInd00
IRS990/ReconcilationRevenueExpnssAmt0-141497
IRS990/RegularMonitoringEnfrcInd01
IRS990/RelatedEntityInd00
IRS990/RelatedOrganizationCtrlEntInd00
IRS990/ReportInvestmentsOtherSecInd00
IRS990/ReportLandBuildingEquipmentInd01
IRS990/ReportOtherAssetsInd00
IRS990/ReportOtherLiabilitiesInd01
IRS990/ReportProgramRelatedInvstInd00
IRS990/RevenueAmt0102472
IRS990/SavingsAndTempCashInvstGrp/BOYAmt0932379
IRS990/SavingsAndTempCashInvstGrp/EOYAmt0810395
IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearAmt0188109
IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus1YearAmt0185936
IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus2YearsAmt0329791
IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus3YearsAmt0563165
IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus4YearsAmt0194848
IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/TotalAmt01461849
IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearAmt0420057
IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus1YearAmt0403668
IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus2YearsAmt0151049
IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus3YearsAmt0298461
IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus4YearsAmt0413652
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IRS990ScheduleA/GrossReceiptsRltdActivitiesAmt0311776
IRS990ScheduleA/PublicOrganization170Ind0X
IRS990ScheduleA/PublicSupportCY170Pct00.46430
IRS990ScheduleA/PublicSupportPY170Pct00.43340
IRS990ScheduleA/PublicSupportTotal170Amt01461849
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IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus1YearAmt0185936
IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus2YearsAmt0329791
IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus3YearsAmt0563165
IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus4YearsAmt0194848
IRS990ScheduleA/TotalCalendarYear170Grp/TotalAmt01461849
IRS990ScheduleA/TotalSupportAmt03148736
IRS990ScheduleB/ContributorInformationGrp/ContributorBusinessName/BusinessNameLine10RESTRICTED
IRS990ScheduleB/ContributorInformationGrp/ContributorNum0RESTRICTED

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