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New eJAAVSO: Light Curve of the Eccentric Eclipsing Binary GSC 3152-1202, by R. K. Buchheim

Abstract

A complete light curve of this eccentric (~2.094d) eclipsing binary system has been determined, in B, V, and R bands. The primary and secondary minima are slightly different in depth, and the color index does not change during either primary or secondary eclipse. Newly-determined times of minimum confirm the previously-suspected rapid change in the orbital phase of the secondary minimum, implying significant apsidal motion.

http://www.aavso.org/ejaavso

Minor VSP upgrades

Hi, all. Today we rolled out some relatively minor upgrades to VSP. There is nothing groundbreaking here. It's mostly minor tweaks and bug fixes. But I'm outlining them here for your information:

Additions
 - There is a new "reset all" button that will reset all fields in the user interface to their default values.
 - The variable star designator (cross hairs at the center of the chart) now appears on all charts, regardless of the limiting magnitude.

New eJAAVSO: The Ross Variable Stars Revisited. I. by W. Osborn, O. F. Mills

Abstract

Better magnitudes and epochs have been determined for 189 of the 379 confirmed and suspected variable stars discovered by Ross from 1925 to 1931. Accurate positions have been determined for those objects for which unambiguous identifications had been lacking.

http://www.aavso.org/ejaavso

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!

Pages

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