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New Logo Contest Deadline is Close

As part of the AAVSO's Centennial Celebrations we are holding a contest to design a new logo for the organization. This is just a quick reminder that the deadline for submission to the contest is July 1. As of this posting we have five submissions. Click here for more information on the logo contest and instructions on how to submit a design. 

20% Discount on New Centennial Book (updated)

July 21 Update: The books are here! The AAVSO has 100 copies of the book that we are selling at the same Cambridge Press discounted rate of $80. So please order from the AAVSO store and help support the organization. We have the books in stock for immediate shipment.

But wait, there's more! If you add an order for one of our limited edition Centennial T-Shirts, we will take $15 off your total order at checkout.

JAAVSO vol. 39, nr. 1, is published

The Journal of the American Association of Variable Star Observers (JAAVSO), Volume 39, Number 1, 2011, is now available for downloading and for hardcopy purchase.


http://www.aavso.org/jaavso-v39n1

AAVSO Eclipsing Binary Ephemeris for 2011 available

The 2011 AAVSO Eclipsing Binary Ephemeris, prepared by Gerry Samolyk, is now available online at

http://www.aavso.org/eclipsing-binary-ephemerides

Good observing!

Special Notice #243: Pre-SN 2011dh images of M51 requested

June 7, 2011: Iair Arcavi and Avishay Gal-Yam (on behalf of the Palomar Transient Factory) write:

Alert Notice 442: Nova Scorpii 2011 = PNV J16551100-3838120 [V1312 Sco]

June 3, 2011

Event: Nova Scorpii 2011 = PNV J16551100-3838120  [V1312 Sco]

Discovered by: John Seach, Chatsworth Island, NSW, Australia

Discovery Date: 2011 June 1.40 UT

Discovery Magnitude: magnitude 9.5 on three CCD images (limiting
mag 11.0) taken with a digital SLR camera (+ 50-mm f/1.2 lens
+ orange filter).  

Coordinates: R.A. = 16:55:11, Decl. = -38:38:12 (equinox 2000.0)

Special Notice #241: New Supernova in M51

June 3, 2010: A new supernova in M51 was discovered by A. Riou and confirmed by several sources, including the Palomar Transient Factory (Silverman et al., ATEL 3398). It is located at 13:30:05.08 +47:10:11.2 J2000 and has a magnitude of about 13.5. Nice images of the supernova can be found at: http://6888comete.free.fr/fr/imageSN.htm PTF also obtained a spectra from Keck, indicating that this is a type II supernova with a relatively blue continuum with P-Cygni profiles in the Balmer series.

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