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News and Announcements

14 May Two new eJAAVSO preprints

ej 229: "Book Review: Scientific Writing for Young Astronomers"(C. Sterken, ed.) reviewd by E. Broens

ej 228: "V1820 Orionis: an RR Lyrae Star With Strong and Irregular Blazhko Effect" by P. de Ponthière et al.

http://www.aavso.org/ejaavso

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:

SDSS J153817.35+512338.0 2013 May 16 22:44:06 through May 17 02:14:05 UT

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.

ASAS J160048-4846.2, scheduled to be be observed 2013 Jul 8 UT, is a WZ Sge-type variable and is 17.9V at min and 12.6V at max.

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:

1RXS J105010.3-140431  2013 May 10 07:51:01 through 12:01:57 UT

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

http://www.aavso.org/ejaavso

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:

1RXS J105010.3-140431  2013 May 10 07:51:01 through 12:01:57 UT

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:

SDSS J154453.60+255348.8 2013 May 1 04:06:20 through 08:17:24 UT

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:

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

There are also a lot of fantastic plugins available for VStar which you can get here:

http://www.aavso.org/vstar-plugin-library

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:

QZ Lib  2013 Apr 26 14:37:44 through 21:23:30 UT

18 April Data Usage Guidelines

 

Data usage guidelines

Revised 2013 April 17

Jump to Formal policy: Acknowledgement for Using AAVSO Data
Jump to Dear Colleague letter from the Director on using AAVSO data

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.

http://www.aavso.org/annual-report

11 April The AAVSO Newsletter - April 2013 - is published

AAVSO Newsletter 56 - April 2013


http://www.aavso.org/aavso-newsletter

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.

We extend sincere apologies to Dr. Szkody for misquoting her and to our readers for the error.


This AAVSO Special Notice was compiled by Elizabeth O. Waagen.

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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:

RZ Leo  2013 Apr 11 07:18:24 through 14:15:5 UT

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 was held at Appalachian State University in Boone, NC.  

QUICK LINKS:

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:

MR UMa  2013 April 4 04:12:40 through 08:44:27 UT

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.

http://www.aavso.org/solar-bulletin

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.

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