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CHOICE course enrollment is open: "CCD Photometry, Part 1"

Topics covered include system testing and basic image calibrations from bias and dark frame subtraction to flat fielding.

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Annual Meeting & Workshop

Submit your abstract | Spectroscopy workshop schedule | Register!

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Join Exoplanet Exploration: Citizens Help NASA Observe Other Worlds with Exoplanet Watch!

https://www.aavso.org/exoplanet-watch-pr

Welcome to the AAVSO!

New explorers are welcome.
YOU can be an astronomer.

https://www.youtube.com/watch?v=tgCB2lBRk8s&t=5s

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The mission of the AAVSO is to enable anyone, anywhere to participate in scientific discovery through variable star astronomy.

Resources

(VSX) Variable Star Index

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The Journal of the AAVSO

/apps/jaavso

Submit and Access Data

/databases

Tools and Observer Resources

/observers

Observing Sections

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Education

CHOICE Courses, Manuals, Videos

/education

Shop

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Join and Support

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The AAVSO is an equal opportunity and discrimination / harassment free environment.
Please read our policies HERE

AAVSO at a Glance

Variable Star Observations in Database:

4 6 , 0 2 1 , 3 3 8 and Counting ...

Last Observation Received:

4 sec ago by MPFA - Pamela Morgan-McKee (US)

Alf Cyg Aug 5.2208 1.280V

Plot Alf Cyg light curve

Alert Notice 751: RU Lup and BP Tau to be observed by HST and XMM-Newton

Aug 3

Alert Notice 750: T CrB photometry and spectroscopy requested for HST and XMM-Newton observations

Aug 3

LPV of the Month (August 2021): miu Cep

Aug 3

Alert Notice 749: Nova in Vulpecula: N Vul 2021 = TCP J20210770+2914093

Jul 30

Photoelectric Targets and Data Reduction

Jul 26

News Archives

Our Stellar Partners

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Resources

Pick a Star

AAVSO at a Glance

Variable Star Observations in Database:

Last Observation Received:

Our Stellar Partners