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News and Announcements | AAVSO
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100 Years of Citizen Astronomy 1911-2011

News and Announcements

AAVSO Alert Notice 443: Long-term monitoring of four AGN in support of ground-based spectroscopy July 8, 2011 - 12:32pm

Dr. Misty Bentz of Georgia State University requests observations of four active galactic nuclei (AGN) for a study of variability in these sources by the STARE Collaboration.

Delta Scorpii: el nacimiento de una estrella Be July 8, 2011 - 9:26am

This is also available in English

Las estrellas Be

El estadio Be no es sólo una etapa evolutiva en las vidas de algunas estrellas calientes de tipo B de rápida rotación sino también un fenómeno transitorio que puede ir y venir con el paso de los años en la misma estrella.  Varias razones se han propuesto para explicar el comportamiento de estas estrellas y aun están en debate.

AAVSO 100th Annual Meeting July 7, 2011 - 2:57pm

October 4-8, 2011

Cambridge & Woburn, MA

The AAVSO 100th Annual Meeting will be held at AAVSO HQ in Cambridge, MA and the Hilton Hotel in Woburn, MA.

Preliminary Meeting Schedule

Registration and Oral/Poster Paper Submission Forms will go online within a week.

Delta Scorpii: the birth of a Be star July 7, 2011 - 9:20am

También disponible en español

The Be stars

Be-ness is not only an evolutionary stage in the lives of some rapidly rotating hot B-type stars but also a transient phenomenon that may come and go over the years for the same star.  Several reasons have been proposed to explain the behavior of these stars and are still in debate.

Charts and Sequences Update July 2011 July 7, 2011 - 8:11am

 

Variable Star iPhone App Now Free July 6, 2011 - 1:49pm

The Variables Stars and AstroClock iPhone apps are now available for free. Thanks, Diatom software!

Arne Henden Receives Leslier C. Peltier Award July 5, 2011 - 10:35am

Arne Henden received the Leslier C. Peltier Award from the Astronomical League last weekend at their annual meeting in Utah. Click here for Sky & Telescope's coverage of the meeting.

Arne joins fellow AAVSO staffer Elizabeth Waagen and current member/observer Gerry Samolyk as past winners.

Basic Observation Planner July 1, 2011 - 9:03am
Variable type (Use "%" for wildcard):
Faint limit of equipment
AAVSO Special Notice #244: Continued close monitoring of T Pyx requested June 30, 2011 - 3:59pm

Continued close monitoring of T Pyx requested

June 30, 2011: Since its outburst on 2011 April 14 (see AAVSO Alert Notice 436), the recurrent nova T Pyx has been very well monitored by visual and instrumental observers who can reach -32o. Thank you! Currently T Pyx is visual/V magnitude ~8.3.

Variable Star Astronomy TOC in Belorussian June 29, 2011 - 4:01pm

Galina Miklosic has recently translated the table of contents for our Variable Star Astronomy curriculum to Belorussian. Thank you, Galina!

New eJAAVSO: Light Curve of the Eccentric Eclipsing Binary GSC 3152-1202, by R. K. Buchheim June 28, 2011 - 10:21am

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 June 28, 2011 - 10:13am

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 June 24, 2011 - 9:03am

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 Observing Section Created to study Young Stellar Objects (YSOs) June 15, 2011 - 5:12pm

 Michael Poxon has taken it upon himself to head a new AAVSO section on his favorite class of variable star: Pre-Main Sequence Stars (YSO/PMS). The AAVSO has had a long history of working with such objects, especially the "Orion variables" that were monitored by many visual observers for years.

New Logo Contest Deadline is Close June 15, 2011 - 10:41am

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. 

The Cepheid Variable M31_V1: Hubble's First Cepheid June 14, 2011 - 3:37pm

20% Discount on New Centennial Book (updated) June 8, 2011 - 12:56pm

June 22 Update: Chris Stephan has reported that the book is backordered until July 31. The AAVSO has ordered 100 copies which we will sell at the discounted rate. We expect arrival in mid July. Stay tuned for the AAVSO order form.

JAAVSO vol. 39, nr. 1, is published June 8, 2011 - 11:35am

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 June 7, 2011 - 4:10pm

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

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

Good observing!

AAVSO Special Notice #243: Pre-SN 2011dh images of M51 requested June 7, 2011 - 3:34pm

Pre-SN 2011dh images of M51 requested

Margaret Mayall Assistantship Open for Applications for Summer 2011 June 6, 2011 - 3:49pm

(update: this position has been filled.)

AAVSO Special Notice #242 June 3, 2011 - 5:36pm

SN 2011dh = Supernova in M51 = PSN J13303600+4706330


June 3, 2011: As an update to AAVSO Special Notice #241 (http://www.aavso.org/aavso-special-notice-241), the supernova in M51 has been designated SN 2011dh. Discovery, classification, and observation information have been published in IAU CBET 2736 (Daniel W. E. Green, ed.).

Coordinates: 13:30:05.08 +47:10:11.2  (J2000.0)

AAVSO Alert Notice 442 June 3, 2011 - 4:25pm

NOVA SCORPII 2011 = PNV J16551100-3838120

AAVSO Special Notice #241 June 3, 2011 - 11:50am

New Supernova in M51

Women in the Geosciences: Past, Present, and Future June 3, 2011 - 11:39am

The following announcement is made on behalf of long time AAVSO observer/member Dr. Kristine Larsen:

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