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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)

http://www.aavso.org/ejaavso140

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.

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.

Abstract Deadline TODAY 3/9!

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

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.
 

SN2011b

 

new sequence

Special Notice #236: HST observations scheduled for SDSS074545

March 4, 2011: Further to AAVSO Alert Notice 431, Dr. Paula Szkody, University of Washington, informs us that the time of the HST observations of SDSS074545 has been set for 5:22-9:32 UT on 2011 March 13. This is Saturday night March 12/13. The ground observations to confirm that the object is not in outburst - and allow the HST observations to take place - will then need to take place on Friday, March 11/12.

Two new jaavso preprints...

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

http://www.aavso.org/ejaavso139

 

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

http://www.aavso.org/ejaavso138

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: http://www.aavso.org/vstar-overview

AAVSO Bulletin 74 for 2011

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

Pages

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