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New ejaavso preprint: "Times of Minima and New Ephemerides..." by A. Marchini et al.

ej 141: "Times of Minima for Several Eclipsing Binaries and New Ephemerides for V569 Lyrae, V571 Lyrae, and V572 Lyrae" (A. Marchini et al.)

Alert Notice 435: V5588 Sgr = Nova Sagittarii 2011 No. 2 = PNV J18102135-2305306 [V5588 Sgr]

Apri1 3, 2011

Event: V5588 SGR = NOVA SAGITTARII 2011 No. 2 = PNV J18102135-2305306  [V5588 Sgr]

Discovered by: Koichi Nishiyama, Kurume, Japan, and Fujio Kabashima, Miyaki, Japan

Discovery Date: ~ 2011 March 27.832 UT

Discovery Magnitude: unfiltered CCD magnitude mag 11.7 on two 40-s unfiltered CCD frames using a 105-mm f/4 camera lens (+ SBIG STL6303E camera)

Position: R.A. = 18:10:21.35, Decl. = -23:05:30.6 (equinox 2000.0)

Special Notice #238: HST observations scheduled for GW Lib

April 2, 2011: Further to AAVSO Alert Notice 433, Dr. Paula Szkody, University of Washington, informs us that the time of the HST observations of GW Lib has been set for Friday night, 2011 April 8/9. The ground observations to confirm that the object is not in outburst - and allow the HST observations to take place - will thus need to take place on Thursday, April 7/8.

Charts and Sequences Update April 2011

April 1, 2011

The following variable stars have either new or revised sequences and charts. If you observe any of these stars you should update your charts to the most recent version. 

Thank you, 
The AAVSO Charts and Sequences Team 







deleted 2 duplicates


Special Notice #237: Nova Sagittarii 2011 No. 2 = PNV J18102135-2305306 [V5588 Sgr]

March 28, 2011: We have been informed by the Central Bureau for Astronomical Telegrams (Central Bureau Electronic Telegram 2679, Daniel W. E. Green, ed.) that Koichi Nishiyama, Kurume, Japan, and Fujio Kabashima, Miyaki, Japan, report their discovery of a possible nova [V5588 Sgr] at magnitude 11.7 on two unfiltered CCD frames taken around March 27.832 UT. They confirmed the object on images taken on March 27.832 UT.

Last Chance! Help us plan for the 100th Annual Meeting of the AAVSO

Hello AAVSOers!

If you have not already completed the survey, please help us to plan for the Centennial Annual Meeting by answering these 10 questions.

Alert Notice 433: Request for observations of GW Lib in support of HST observations

March 20, 2011: Dr. Paula Szkody, University of Washington, has requested our help in monitoring the cataclysmic variable GW Lib for upcoming Hubble Space Telescope observations, scheduled to be made during the week of 2011 April 7-11 UT. Dr. Szkody also observed this object with HST in March 2010 (see AAVSO Alert Notice 417).

Centennial Celebration Update March 2011

We are nearing the end of the first quarter of our centennial year. This is a good time to take a look at what has transpired thus far and what is yet to come.

Observer Challenges

The Twenty Million and Counting! Contest is over now that the database has passed this milestone. The winner, with the prediction closest to the actual day of the milestone was Christopher Watson of San Diego, California.


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