Skip to main content

News and Announcements

15 April AAVSO Alert Notice 437

Campaign to monitor the recurrent nova T Pyx throughout 2011 eruption

April 15, 2011:  Further to AAVSO Alert Notice 436, a fast photometry observing campaign has been initiated by Dr. Bradley Schaefer (Louisiana State University) to monitor the recurrent nova T Pyxidis throughout its current eruption.

14 April Alerta de AAVSO 436

Erupción de la nova recurrente T Pyxidis
14 de abril de 2011

La nova recurrente T Pyxidis ha sido descubierta en erupción. Fue detectada por M. Linnolt (Hawaii, Estados Unidos) con magnitud visual 13.0 en abril 14.2931, 2011 (JD 2455665.7931), y confirmada por A. Plummer (m(vis)=12.2, JD 2455665.8847) y S. Kerr (m(vis)=11.3, JD 2455665.9410).  Esta es la primer erupción de T Pyx desde el 7 de diciembre de 1966, hace casi 45 años. Se solicitan urgentemente observaciones de esta rara variable eruptiva, comenzando inmediatamente.

14 April AAVSO Alert Notice 436

Outburst of the recurrent nova T Pyx

06 April 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.)

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

Apri1 3, 2011

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

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)

02 April AAVSO Special Notice #238

HST observations scheduled for GW Lib

01 April 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 






31 March How to report new variable star discoveries

What do I do when I discover a new variable star?

(Jump to Reporting Possible Nova Discoveries)

30 March Alert Notice 434: Outburst of NSV 1436

March 30, 2011: The cataclysmic variable NSV 1436 has been discovered in outburst.  This is the first bright outburst of this star observed since 1948, and followup observations are strongly encouraged.  Little is known about the nature of NSV 1436, and observations may help shed light on whether the star is an infrequently outbursting normal dwarf nova, a WZ Sge star, or recurrent nova.

28 March AAVSO Special Notice #237

NOVA SAGITTARII 2011 No. 2 = PNV J18102135-2305306

21 March Edward A. Halbach, 1909-2011

21 March 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.

20 March 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).

16 March 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.

16 March New ejaavso preprint: "Orbital Period of Three Cataclysmic Variables" by P. Wils

ej 140: "The Orbital Period of Three Cataclysmic Variables From WASP Data" (P. Wils)

14 March Alert Notice 432: Supernova 2011at = PSN J09285756-1448206 in MCG -02-24-27

March 14, 2011

Discovered by: Lou Cox, Jack Newton, and Tim Puckett, Ellijay, GA, in the course of the Puckett Observatory Supernova Search

Discovery Date: March 10.214 UT

Discovery Magnitude: unfiltered CCD magnitude 14.5 (limiting magnitude 19.0) taken with a 0.40-m reflector at Portal, AZ

Position: R.A. = 09:28:57.56  Decl. = -14:48:20.6 (equinox 2000.0)
SN 2011at is 20.4" east and 6.3" north of the center of PGC 26905 = MCG -02-24-27.

14 March 2nd DSLR Online Chat: March 19 at 11:00 AM ET

Members from the Citizen Sky DSLR Documentation and Reduction team will be hosting a second chat on Saturday, March 19 at 11:00 AM Eastern.  If you have questions about using your DSLR camera for photometry, or any portion of their tutorials please plan to attend.  Science questions are also welcome. More details on how to join the chat will follow this week. Click here for info on how to join the chat.

09 March Abstract Deadline TODAY 3/9!

This is a friendly abstract deadline reminder for the joint AAVSO/AAS meeting being held in Boston this May:

05 March DSLR Chat Transcript From Last Saturday at 11am ET (-5UT)

Note: This chat is over. A transcript can be found here.

05 March Charts and Sequences update March 2011


The following stars have new or revised sequences since Feb. 02, 2011.
If you observe any of these stars, please update your charts as soon as possible.
This batch of updates includes many stars visible from the southern heisphere only.


04 March AAVSO Special Notice #236

HST observations scheduled for SDSS074545

04 March Two new jaavso preprints...

ej 139: Recent Maxima of 56 Short Period Pulsating Stars (G. Samolyk)


ej 138: The Z CamPaign: Year 1 (M. Simonsen)

02 March View your VPHOT data with VStar!

A new version of VStar has just been released, and along with it, a plugin that will allow you to upload data to plot in the AAVSO Extended File Format. Which means... you can now view your data as output by VPHOT.

To download VStar or read more about it, please visit this page:

To read more about the VStar plugin mentioned above or download it or one of the other ones for your own use, see this page:

25 February AAVSO Bulletin 74 for 2011

Predicted Dates of Maxima and Minima of 381 Long Period Variables for 2011

24 February Alert Notice 431: Request to monitor SDSS074545 for HST Observations

February 25, 2011: Dr. Paula Szkody (University of Washington) has requested our help in monitoring the cataclysmic variable SDSS074545 (SDSS J074531.91+453829.5) for upcoming Hubble Space Telescope observations. The HST observations are scheduled to be made during the week of 2011 March 7-14. Dr. Szkody also observed this object with HST in October-November 2007 (see AAVSO Alert Notice 359).

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