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AAVSO Bulletin

The AAVSO Bulletin: Predicted Dates of Maxima and Minima of Long Period Variables is a long-running publication of the AAVSO. It gives predictions of dates of maxima and minima for hundreds of long period variables (Miras and semiregulars) in the AAVSO program, and is intended to be an observing guide and planning tool for all observers of LPV stars, amateur and professional alike.

The currently published Bulletin for January 2018 through February 2019 is Bulletin 81.

AAVSO Bulletin 73 for 2010 00 hr


IMPORTANT NOTICE: Bulletin 73 was NOT prepared in the same way as in the past. 
READ THE INTRODUCTION before you use the Bulletin; contact AAVSO Headquarters for more precise dates for research.

# - needs more observations
& - needs more observations urgently
@ - needs more observations very urgently
% - has fair to excellent photometric data but needs visual observations


AAVSO Bulletin 73 for 2010 in a single text file

Dear Observers,						February 2010

AAVSO Bulletin 73, containing predicted maxima and minima dates for 562 long 
period variables for 2010 and approximate dates for January and February 2011, 
has been published and is available online. Paper copies are also available on 
request to AAVSO Headquarters.

Materials in the Bulletin folder include:
 - Note to Observers for 2010 (please read!)
 - How to Use Bulletin 73 (contains new information; please be sure to read)

AAVSO Maxima and Minima of Long Period Variables, 1900-2008

Elizabeth O. Waagen, Janet A. Mattei, and Matthew R. Templeton

Click here for data access


Long-term observations of long period variable stars are essential to the determination of period, change in period, change in behavior resulting from mass loss and/or evolution, mode of pulsation (fundamental or overtone), internal structure, and phase at specific times for these stars.

Observed Maxima Timings of RR Lyrae Stars

Observed Maxima Timings of RR Lyrae Stars

Globular Cluster Omega Centauri
Many RR Lyrae stars were discovered in globular clusters where they could be used as standard candles for cosmic distance estimations.


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