AMERICAN ASSOCIATION OF VARIABLE STAR OB
EIN 04-2164402 · Science & Technology (U310)
What they do
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. THE AAVSO HAS ABOUT 30 of THESE CAMPAIGNS EACH YEAR. THE OBSERVATIONS and DATABASES ARE CITED IN ABOUT 300 RESEARCH ARTICLES EACH YEAR.
How to reach them
ContactBRIAN KLOPPENBORGEXECUTIVE DIRECTOR
In care of% DR BRIAN KLOPPENBORG
Mailing address1770 MASSACHUSETTS AVE STE 121, CAMBRIDGE, MA 02140-2808
Main phone(617) 354-0484 WebsiteVisit the charity’s website Emailaavso@aavso.orgAdditional emailfeedback@aavso.orgSource: Form 990 public record. Confirm details with the nonprofit before visiting or sending anything.
Represent this organization?Claim this nonprofit to change contact informationAbout this charity
- Recognized since
- February 1954
- County
- Middlesex
Should I give to this charity?
Of every $100 spent, about $60.40 was reported for mission work. Use the spending picture below and ask what results that work produced.
Plain answer: A tax form cannot prove that a charity is doing good. It can show how the charity says it spent its money—and point out questions you should ask.
Basic facts we verified
Money report from 2024The charity has a recent tax report to read.
They explain their jobThe charity tells us what it is trying to do.
They name their leaders15 people are listed in the latest report.
You can reach themThey list contact information, so you can ask questions.
Money made simple
Ask these three easy questions
- Who did you help? Ask for a recent story or report that shows real results.
- What will my money do? Ask exactly what your gift will pay for.
- Is this really the charity? Give only through its official website or confirmed phone number.
Bottom line: Do not decide from a name, mission statement, or tax status alone. Look at where the money went, then ask what changed, who was helped, and what your gift will do. YouCanGiveBack does not endorse or grade organizations.
Financial picture
A quick look at the charity’s latest reported finances. The complete report adds exact spending amounts, financial history, grants, funders, contractors, fees, and leadership pay.
How reported expenses were divided
This free view shows the broad spending mix. Exact dollar amounts and revenue comparisons are included in the complete report.
Mission work is the Form 990 category called program services. These are the organization’s reported accounting categories, not an independent measure of results.