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News and Announcements

17 April Spring Meeting Hotel Deadline Extended!

The deadline for hotel reservations for the upcoming spring meeting has been extended to April 22nd!  It is not too late to decide to join us at Appalachian State University for this unique meeting.  Please visit the Meeting Information Page for details and the registration link.

17 April Solar Bulletin - Volume 69, Number 3

The March 2013 Solar Bulletin is now available.

16 April Annual Report for 2011-2012 is published

The AAVSO Annual Report for FY 2011-2012 is now available online.

11 April The AAVSO Newsletter - April 2013 - is published

AAVSO Newsletter 56 - April 2013

09 April Special Notice #347: Correction to AAVSO Special Notice #346

April 9, 2013:  In AAVSO Special Notice #346 (, IU Leo was said to have a close companion about 2 arcsec to the NE. This is not correct - it is IY UMa that has this close companion.

We extend sincere apologies to Dr. Szkody for misquoting her and to our readers for the error.

This AAVSO Special Notice was compiled by Elizabeth O. Waagen.


08 April Special Notice #346: RZ Leo observations critical now for HST/COS and IU Leo next target

April 8, 2013:  Further to AAVSO Alert Notice 471 ( and AAVSO Special Notice #345 (, HST/COS is scheduled to observe the eclipsing SU UMa-type dwarf nova RZ Leo:

RZ Leo  2013 Apr 11 07:18:24 through 14:15:5 UT

04 April Charts and Sequences Update April 2013

The following charts (listed in order by constellation) have new or revised sequences since December 20, 2012. This list is quite long. A .csv file is available as an attachment here at the bottom of the page as well.

If you observe any of these stars please update your charts as soon as possible. 

03 April 102nd Spring Meeting of the AAVSO

AAVSO 102nd Spring Meeting was held at Appalachian State University in Boone, NC.  


03 April Alert Notice 482: Monitoring requested for dust production study in developing planetary systems

April 4, 2013: Huan Meng and Dr. George Rieke (University of Arizona) have requested AAVSO assistance in monitoring three bright stars with developing planetary systems. The stars have been observed with NASA's Spitzer Space Telescope to have varying levels of dust in the circumstellar disk. These varying levels are thought to be produced through collisions among the asteroid-size debris in the disk.

02 April Special Notice #345: MR UMa observations needed now and RZ Leo next HST/COS target

April 2, 2013:  Further to AAVSO Alert Notice 471 ( and AAVSO Special Notice #344 (, HST/COS is scheduled to observe the eclipsing SU UMa-type dwarf nova MR UMa:

MR UMa  2013 April 4 04:12:40 through 08:44:27 UT

27 March AAVSO Solar Bulletin 1945-1953

Scanned copies of the AAVSO Solar Bulletin Vol. 1 (1945) through Vol. 9 (1953) are now online. These first nine volumes were edited and produced by the first Solar Division Chairman, Neal J. Heines (1892-1955).

Our thanks to volunteer Anna Hillier for making these scans at AAVSO Headquarters.

25 March Special Notice #344: IY UMa and MR UMa next HST/COS targets

March 25, 2013:  Further to AAVSO Alert Notice 471 ( and AAVSO Special Notice #342 (, HST/COS is scheduled to observe the eclipsing SU UMa-type dwarf nova IY UMa:

19 March Alert Notice 481: Nova Survey participation requested

March 19, 2013:  The AAVSO solicits participation in an online survey from our member and observer communities. The survey is being conducted in advance of an upcoming long-term observing campaign that will be launched in mid-April 2013.  We are seeking participation in this survey from as broad a sample of the AAVSO community as possible, and your responses will help us gauge the effectiveness of the campaign and serve the observer community better.

18 March Special Notice #343: GK Per outburst appears to be underway

March 18, 2013:  The old nova GK Per (N Per 1901), which has dwarf nova outbursts, appears to be going into outburst, according to observations submitted to the AAVSO International Database:

2013 March 11.03 UT, 13.0 (John Bortle, Stormville, NY);
12.87, 12.8 (Bill Wilson, Grange over Sands, Cumbria, England);
14.83, 12.7 (Gary Poyner, Birmingham, England);
15.02429 UT, 12.6 (Miroslav Komorous, London, ONT, Canada);
15.09443, 12.7 (Larry Shotter, Uniontown, PA);

18 March Special Notice #342: PU CMa, then IY UMa and MR UMa next HST/COS targets

March 18, 2013:  Further to AAVSO Alert Notice 471 (, HST/COS is scheduled to observe the SU UMa-type dwarf nova PU CMa:

PU CMa   2013 March 22 00:00:43 through 02:36:08 UT

The HST observations of PU UMa may be cancelled/postponed, as PU CMa is currently in outburst, according to observations reported to the AAVSO:

18 March New CHOICE Courses: Final days of registration!

Our two new CHOICE courses begin today. There is still time to register just under the wire! 

"Visual Observing Basics" and "CCD Photometry, Part One" will both will run March 18 through April 12, 2013.  Visit the CHOICE homepage for more details and the registration link!

14 March Special Notice #341: V485 Cen observations crucial tonight through Sunday night

March 14, 2013:  Further to AAVSO Alert Notice 471 ( and AAVSO Special Notice #340 (, HST/COS is scheduled to observe the dwarf nova V485 Cen on 2013 March 16:

    V485 Cen  2013 March 16 03:02:56 through 09:44:57 UT

13 March Solar Bulletin - Volume 69, Number 2

The February 2013 Solar Bulletin is now available.

12 March Manual for Visual Observing of Variable Stars - update

The Manual for Visual Observing of Variable Stars (in English) has just been updated. To download this new and improved version, please visit

Many thanks to Mike Simonsen, Elizabeth Waagen and Matthew Templeton for their input and helpful suggestions.

Sara Beck
AAVSO Technical Staff, Science Team

08 March Alert Notice #480: MR UMa superoutburst coverage requested for HST observations

March 8, 2013:  Dr. Boris Gaensicke (Warwick University) has requested observations of the currently-outbursting SU UMa-type cataclysmic variable MR UMa in preparation for and support of HST observations scheduled for the week 2013 April 4-7.

06 March Special Notice #340: HST/COS observations 2013 March 8 and March 9

March 6, 2013: Further to AAVSO Alert Notice 471 ( and AAVSO Special Notice #339 (, HST/COS is scheduled to observe two of the dwarf novae in the CV campaign back-to-back:

on 2013 March 8:
SDSS J103533.03+055158.4  2013 March 8 07:42:37 through 15:04:27 UT
(V=18.8 at minimum, has eclipses)

28 February Special Notice #339: V406 Vir (SDSS J123813.73-033932.9) HST/COS observations early tomorrow

February 28, 2013:  Further to AAVSO Alert Notice 471 ( and AAVSO Special Notice #338 (, HST/COS is scheduled to observe V406 Vir (SDSS J123813.73-033932.9) tomorrow:

           V406 Vir 2013 March 1 08:37:30 through 14:04:33 UT

27 February Bulletin 76 for 2013 published and available online

AAVSO Bulletin 76 - Predicted Dates of Maxima and Minima of Long Period Variables for 2013 - has been published and is available from the AAVSO Bulletin page.

AAVSO Bulletin 76 gives predicted dates for 381 Mira and semiregular variables for the period January 2013 through February 2014. These dates are based on observations in the AAVSO International Database.

26 February ASP 125th Annual Meeting

The Astronomical Society of the Pacific (ASP) will hold its 125th Annual Meeting on "Ensuring STEM Literacy" in San Jose, CA from July 20 to July 24, 2013.  Early bird registration has begun and abstracts are currently being accepted.  Please visit the ASP meeting page for more information.

24 February Professional Astronomers: Invitation to Participate in an AAVSO Survey

The American Association of Variable Star Observers (AAVSO) invites the participation of professional astronomers in our "Professional Astronomer Survey of 2013."

AAVSO 49 Bay State Rd. Cambridge, MA 02138 617-354-0484