News and Announcements
|13 May||Special Notice #353: SDSS J153817.35+512338.0 obs crucial now and DT Oct is next||
May 13, 2013: Further to AAVSO Alert Notice 471 (http://www.aavso.org/aavso-alert-notice-471) and AAVSO Special Notice #351 (http://www.aavso.org/aavso-special-notice-351), HST/COS is scheduled to observe the dwarf nova SDSS J153817.35+512338.0:
|09 May||AAVSO Councilor Dr. Chryssa Kouveliotou elected to National Academy of Sciences||
We are pleased and proud that AAVSO Council member Dr. Chryssa Kouveliotou has been elected to membership in the National Academy of Sciences.
|08 May||Special Notice #352: Correction to target name in Special Notice #351||
May 8, 2013: In AAVSO Special Notice #351 (http://www.aavso.org/aavso-special-notice-351), one of the upcoming HST/COS targets was referred to as ASAS1600-48. The name of this system as found in VSX is ASAS J160048-4846.2. Please use this name when reporting observations to the AAVSO International Database. Many thanks.
|08 May||Special Notice #351: 1RXS J105010.3-140431 obs crucial now and upcoming targets||
May 8, 2013: Further to AAVSO Alert Notice 471 (http://www.aavso.org/aavso-alert-notice-471)and AAVSO Special Notice #350 (http://www.aavso.org/aavso-special-notice-350), HST/COS is scheduled to observe the eclipsing WZ Sge-type cataclysmic variable 1RXS J105010.3-140431:
|06 May||Three new JAAVSO preprints||
ej 225: "Two New Cool Variables in the Field of NGC 659" by Steven P. Souza
ej 226: "The Interesting Light Curve and Pulsation Frequencies of KIC 9204718" by Garrison Turner and John Holaday
ej 227: "Nine New Variable Stars in Cygnus and Variability Type Determination of [Wm2007] 1176" by Riccardo Furgoni
|30 April||Special Notice #350: 1RXS J105010.3-140431 and SDSS J153817.35+512338.0 next HST/COS targets||
April 30, 2013: Further to AAVSO Alert Notice 471 (http://www.aavso.org/aavso-alert-notice-471), HST/COS is scheduled to observe the eclipsing WZ Sge-type cataclysmic variable 1RXS J105010.3-140431:
|30 April||Special Notice #349: HST/COS Observations CANCELLED for SDSS J154453.60+255348.8||
April 30, 2013: Further to AAVSO Alert Notice 471 (http://www.aavso.org/aavso-alert-notice-471) and AAVSO Special Notice 348 (http://www.aavso.org/aavso-special-notice-348), HST/COS was scheduled to observe the eclipsing dwarf nova SDSS J154453.60+255348.8 tonight:
|30 April||New VStar Release||
VStar version 2.15.1 has just been released. If you have been using VStar already, the new version will be automatically downloaded next time you open it. If you have never used VStar before (or don't know what it is) then you can learn about it and download the latest version from this page:
There are also a lot of fantastic plugins available for VStar which you can get here:
|28 April||Optical observations of GRB 130427A||
We're pleased to note that GCN Circular #14490 has been published, detailing time-series photometry of the bright GRB 130427A by Patrick Wiggins. His observations provide a comprehensive record of the three hours of the early evolution of this incredibly bright afterglow.
Congratulations to Patrick on his observations!
|22 April||Special Notice #348: QZ Lib observations critical now for HST/COS and SDSS J154453.60+255348.8 next target||
April 22, 2013: Further to AAVSO Alert Notice 471 (http://www.aavso.org/aavso-alert-notice-471), HST/COS is scheduled to observe the eclipsing WZ Sge-type cataclysmic variable QZ Lib:
|18 April||Data Usage Guidelines||
Data usage guidelines
Revised 2013 April 17
|17 April||Spring Meeting Hotel Deadline Extended!||
The deadline for hotel reservations for the upcoming spring meeting has been extended to April 22nd! It is not too late to decide to join us at Appalachian State University for this unique meeting. Please visit the Meeting Information Page for details and the registration link.
|17 April||Solar Bulletin - Volume 69, Number 3||
The March 2013 Solar Bulletin is now available.
|16 April||Annual Report for 2011-2012 is published||
The AAVSO Annual Report for FY 2011-2012 is now available online.
|11 April||The AAVSO Newsletter - April 2013 - is published||
AAVSO Newsletter 56 - April 2013
|09 April||Special Notice #347: Correction to AAVSO Special Notice #346||
April 9, 2013: In AAVSO Special Notice #346 (http://www.aavso.org/aavso-special-notice-346), IU Leo was said to have a close companion about 2 arcsec to the NE. This is not correct - it is IY UMa that has this close companion.
|08 April||Special Notice #346: RZ Leo observations critical now for HST/COS and IU Leo next target||
April 8, 2013: Further to AAVSO Alert Notice 471 (http://www.aavso.org/aavso-alert-notice-471) and AAVSO Special Notice #345 (http://www.aavso.org/aavso-special-notice-345), HST/COS is scheduled to observe the eclipsing SU UMa-type dwarf nova RZ Leo:
|04 April||Charts and Sequences Update April 2013||
The following charts (listed in order by constellation) have new or revised sequences since December 20, 2012. This list is quite long. A .csv file is available as an attachment here at the bottom of the page as well.
If you observe any of these stars please update your charts as soon as possible.
|03 April||102nd Spring Meeting of the AAVSO||
AAVSO 102nd Spring Meeting will be held at Appalachian State University in Boone, NC. We hope that you will be able to join us for this very special meeting.
Click to jump straight to the Meeting Operations Page, where you can register, view your registration summary, pay your registration fee, submit an abstract, or revise your abstract.
|03 April||Alert Notice 482: Monitoring requested for dust production study in developing planetary systems||
April 4, 2013: Huan Meng and Dr. George Rieke (University of Arizona) have requested AAVSO assistance in monitoring three bright stars with developing planetary systems. The stars have been observed with NASA's Spitzer Space Telescope to have varying levels of dust in the circumstellar disk. These varying levels are thought to be produced through collisions among the asteroid-size debris in the disk.
|02 April||Special Notice #345: MR UMa observations needed now and RZ Leo next HST/COS target||
April 2, 2013: Further to AAVSO Alert Notice 471 (http://www.aavso.org/aavso-alert-notice-471) and AAVSO Special Notice #344 (http://www.aavso.org/aavso-special-notice-344), HST/COS is scheduled to observe the eclipsing SU UMa-type dwarf nova MR UMa:
|27 March||AAVSO Solar Bulletin 1945-1953||
Scanned copies of the AAVSO Solar Bulletin Vol. 1 (1945) through Vol. 9 (1953) are now online. These first nine volumes were edited and produced by the first Solar Division Chairman, Neal J. Heines (1892-1955).
Our thanks to volunteer Anna Hillier for making these scans at AAVSO Headquarters.
|25 March||Special Notice #344: IY UMa and MR UMa next HST/COS targets||
March 25, 2013: Further to AAVSO Alert Notice 471 (http://www.aavso.org/aavso-alert-notice-471) and AAVSO Special Notice #342 (http://www.aavso.org/aavso-special-notice-342), HST/COS is scheduled to observe the eclipsing SU UMa-type dwarf nova IY UMa:
|19 March||Alert Notice 481: Nova Survey participation requested||
March 19, 2013: The AAVSO solicits participation in an online survey from our member and observer communities. The survey is being conducted in advance of an upcoming long-term observing campaign that will be launched in mid-April 2013. We are seeking participation in this survey from as broad a sample of the AAVSO community as possible, and your responses will help us gauge the effectiveness of the campaign and serve the observer community better.
|18 March||Special Notice #343: GK Per outburst appears to be underway||
March 18, 2013: The old nova GK Per (N Per 1901), which has dwarf nova outbursts, appears to be going into outburst, according to observations submitted to the AAVSO International Database: