American Association of Variable Star Observers

What American Association of Variable Star Observers does

The American Association of Variable Star Observers (AAVSO) is a 501(c)(3) nonprofit founded in 1911 and headquartered in Cambridge, Massachusetts, that operates one of the world's largest citizen-science astronomy platforms. Its core function is collecting, curating, and distributing variable star observations contributed by a global network of amateur and professional astronomers; the AAVSO International Database now holds over 84 million observations and continues to receive new submissions in near-real time (e.g., a T CrB observation logged 19 minutes before page render). The organization coordinates time-sensitive observing campaigns supporting NASA missions including the Hubble Space Telescope, TESS, and James Webb Space Telescope, and issues more than 800 historical Alert Notices to mobilize the observer network around novae, exoplanet transits, and other transient events.

The platform is an integrated suite of web applications and databases: VSX (Variable Star Index) as the canonical variable star catalog, VSP for finder charts, LCG for light-curve generation, VPhot for photometric reduction, AVSpec for spectroscopy, Exosite for exoplanet data, the LPV Maxima/Minima historical archive, and the AAVSOnet robotic telescope network. VSX cross-references external catalogs including SIMBAD, Gaia DR3, SDSS, ASAS-SN, CRTS, SuperWASP, Aladin, APASS, and DESI-Legacy, making AAVSO a coordinating layer between amateur observation and professional survey infrastructure. The organization also publishes the peer-reviewed JAAVSO journal and operates educational programs (CHOICE courses), an annual meeting (115th in November 2026 in Santa Fe), and community forums now hosted on a modern platform at forums.aavso.org.

AAVSO's business model is that of a member-supported scientific nonprofit. Revenue is generated through annual membership dues, voluntary donations, store merchandise sales, and JAAVSO publication revenue, supplemented by NSF funding and in-kind contributions from institutional partners. Membership is global, with active observers in the USA, UK, Australia, and New Zealand among other countries. The organization is governed by a board led by Director Dr. Brian Kloppenborg and Treasurer Robert Stephens, with no parent company, equity ownership, or external investors; financial figures are not publicly disclosed.

Name

American Association of Variable Star Observers

Legal name

American Association of Variable Star Observers

Website

https://aavso.org

Company type

Private

Founded year

1911

Operating status

Operating

Headcount range

11–50 employees

Short description

AAVSO is a 501(c)(3) nonprofit founded in 1911 that runs a global citizen-science platform collecting, curating, and distributing variable star observations from amateur and professional astronomers, with 84M+ observations supporting NASA missions and peer-reviewed research.

Ownership category

akta.pro rank

Product category

Citizen Science Astronomy Platform

NAICS

Other Scientific and Technical Consulting Services (541690), Computer Systems Design and Related Services (54151)

SIC

Services-Computer Integrated Systems Design (7373)

akta.pro primary industry

Survey, Panel & Fieldwork Services (BPAHALAJ)

Keywords

• Variable star observation
• Citizen science astronomy
• Photometric data analysis
• Amateur astronomy community
• Stellar variability research

Headquarters

HQ city

Cambridge

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2C

Offering type

Software

Cost components

Personnel, Technology or R&D, Operations, Marketing or Sales, Others

Revenue model

1. Membership Dues: Annual membership fees for individuals joining the AAVSO organization with benefits including access to databases, resources, and community participation.
2. Donations: Voluntary contributions from supporters, members, and the public to support the organization's mission and operations.
3. Store Sales: Sale of merchandise, publications, and educational materials through the AAVSO store.
4. JAAVSO Publications: The Journal of the American Association of Variable Star Observers published periodically, available in print and digital formats.

Go-to-market motion1 record

Distribution channels5 records

Marketing channels9 records

Core offering

The AAVSO operates a comprehensive variable star observation and research platform combining multiple proprietary databases (VSX, International Database with 84+ million observations, AVSpec, Exosite) and web-based analysis tools (LCG, VSP, VPhot, Global Data Search). The organization coordinates a global network of amateur observers who contribute photometric and spectroscopic data, supports professional astronomical research including space telescope missions, publishes the peer-reviewed JAAVSO journal, and provides educational courses through the CHOICE program.

Product overview

AAVSO provides a comprehensive platform for variable star observation and research, combining multiple interconnected tools and databases. The core offerings include the VSX (Variable Star Index) for variable star information, VSP (Variable Star Plotter) for finder charts, LCG (Light Curve Generator) for light curve visualization, VPhot for photometric reduction, and AVSpec for spectroscopy data. Supporting platforms include Global Data Search and Submit Photometric Observations applications, the Exosite exoplanet database, JAAVSO academic journal, AAVSOnet robotic telescope network, LPV Maxima and Minima historical database, MyNewsFlash and Alert Notices notification systems, the AAVSO Forums community platform, and CHOICE educational courses. The organization coordinates global amateur observations for professional astronomical research.

Differentiator

Problem solved

Functional benefit

Brands

• VSX (Variable Star Index): International Variable Star Index database maintained by AAVSO
• JAAVSO (The Journal of the AAVSO)
• AAVSOnet
• VPhot
• AAVSO Exoplanet Database (Exosite)

Named customers1 record

Segments4 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

Yes

API docs

API detail

Core technology

AI maturity

App detail

Integration10 records

AI capability4 records

Feature10 records

Partnerships

Two partnerships are on record, tiered core and minor.

• NASAcoreStrategic or Co-development PartnerNASA collaborates with AAVSO for ground-based observations supporting space telescope missions including Hubble Space Telescope, TESS, and James Webb Space Telescope. AAVSO observers provide photometric monitoring of exoplanet host stars and other targets requiring ground-based complement to space observations.
• Sky & TelescopeminorGTM or Marketing PartnerListed as a stellar partner on the AAVSO website. Sky & Telescope is a prominent astronomy publication and media outlet.

Scale indicators4 records

Recent moves7 records

Expansion highlights5 records

Others

• Sky & Telescope: Major amateur astronomy media outlet and AAVSO 'Stellar Partner'. Relevant as an adjacent ecosystem player reaching the same hobbyist audience and publishing on variable star topics.

Direct peers

• eBird (Cornell Lab of Ornithology): Citizen science project collecting bird observations from a global amateur network into a research database. Closely mirrors AAVSO's panel-based model of volunteer data collection feeding scientific research.
• Globe at Night: Citizen science campaign for measuring light pollution using stellar observations. Comparable niche citizen-science astronomy initiative leveraging amateur observers for global data collection.
• iNaturalist: Citizen science platform where amateur naturalists contribute observations to a shared global database. Directly comparable to AAVSO in operating model: volunteer contributors, large observational database, research-grade data outputs.
• Astronomical Society of the Pacific: Long-running U.S. astronomy nonprofit focused on education and public outreach. Similar nonprofit mission, audience overlap with amateur astronomers, and comparable educational programming to AAVSO.
• Zooniverse: The largest online citizen science platform, hosting projects across multiple scientific domains including astronomy. Comparable to AAVSO as a hub for distributed volunteer contributors generating research-grade data.

Emerging players

• Las Cumbres Observatory: Global network of robotic telescopes supporting time-domain and follow-up astronomy. Comparable to AAVSOnet in operating distributed automated telescopes for research and educational use.

Broad incumbents

• Royal Astronomical Society: Established professional astronomical society in the UK with broader scientific scope and membership base. Comparable as a long-standing astronomy membership organization, though more focused on professional astronomy than citizen observation.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• Xx.com/AAVSO
• YouTubeyoutube.com/channel/UCsAmXgodtwToO-pY9A6NpMQ
• Facebookfacebook.com/AAVSO
• Instagraminstagram.com/aavso
• LinkedInlinkedin.com/company/american-association-of-variable-star-observers

Revenue estimate

Valuation estimate

Number of profiles

Profiles10 records

Funding overview

Funding rounds

Investors

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M&A

Investments

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Frequently asked questions about American Association of Variable Star Observers