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News and Announcements

19 July Special Notice #364: 1RXS J213807.1+261958 (OT J213806.6+261957) HST obs next week

July 19, 2013: HST/COS is scheduled to observe the WZ Sge-type variable 1RXS J213807.1+261958 (= OT J213806.6+261957) next week. Observations are scheduled for:

1RXS J213807.1+261958 (OT J213806.6+261957)
            2013 July 25 17:26:50 through 21:05:23 UT


The scheduling team will likely make their final decision early on July 24, and your observations will be essential now through July 26.

16 July Special Notice #363: HS 2214+2845 (= V513 Peg) obs critical now

July 16, 2013: Based on your observations, the HST/COS team will be making the final decision tomorrow afternoon (2013 July 17) or the next morning whether to observe the dwarf nova HS 2214+2845 = V513 Peg on:

V513 Peg (HS 2214+2845) 2013 July 18 21:08:59 through July 19 01:04:23 UT


V513 Peg is 16.8V at minimum and 12.5V at maximum. Please monitor V513 Peg closely through July 19.

16 July Two new eJAAVSO preprints

ej238: "I-band Measurements of Red Giant Variables: Methods and Photometry of 66 Stars" by T. T. Moon

ej239: "V2331 Cygni is an Algol Variable With Deep Eclipses" by H. Bengisson, et al.

www.aavso.org/ejaavso

12 July Solar Bulletin - Volume 69, Number 6

The June 2013 Solar Bulletin is now available.

11 July VStar Version 2.15.3 Release

VStar version 2.15.3 has just been released!

This version of VStar includes a new .jnlp file which means that if you used VStar before and have a file called vstar.jnlp on your computer, you should delete it and get the new one by clicking the "Download VStar Now" file from here:

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

You should also replace any plugins you have with new versions from here:

11 July Announcing the 2013 AAVSO Council Nominees

Please click on the names of the nominees to view their extended online biographies.  All members will receive Council election ballots in the mail before the end of August.  Best of luck to all of our nominees!

08 July Special Notice #362: OR And and AX For obs critical now

July 8, 2013: The VY Scl variable OR And continues in its low state, so it has been scheduled for HST/COS observations. Based on your observations, the HST/COS team will be making the final decision tomorrow morning (2013 July 9) whether to observe OR And on:

OR And 2013 July 10 11:47:01 through 15:56:12 UT

OR And is ~18V in its low state and ~14.5V in its high state.

03 July The July AAVSO Newsletter is published

AAVSO Newsletter 57 - July 2013

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

01 July Visual Observing Manual in Hungarian - 2013 edition

The Hungarian version of the recently revised Manual for Visual Observing of Variable Stars - Vizuális Változócsillag-észlelők Kézikönyve - is now available for download here:

http://www.aavso.org/visual-observing-manual-hungarian

25 June Charts and Sequences Update June 2013

Improvements to existing sequences and creation of new sequences for newly discovered and previously known variables continues at a brisk pace. Below is a list of new or revised sequences adopted since April 4, 2013.

If you observe any of these stars, please be sure you are using th most recent version of the comparison star sequence on your charts.

This list is attached below in .csv and .xlsx formats for your convenience.

24 June Special Notice #361: CC Scl observations DATE REVISED

June 24, 2013: The date given in AAVSO Special Notice #360 for the HST/COS  observations of the SU UMa-type dwarf nova CC Scl has been REVISED from June 27 to:

CC Scl   2013 Jun 29 03:19:13 through 05:54:10 UT

The HST team will be making a final decision early on June 28 about observing CC Scl based substantially on your observations, so they are essential.
 

24 June Special Notice #360: CC Scl observations critical this week

June 24, 2013: HST/COS is scheduled to observe the SU UMa-type dwarf nova CC Scl:

CC Scl   2013 June 27 02:12:04 through 05:39:30 UT

The HST team will be making a final decision early on June 26 about observing CC Scl based substantially on your observations, so they are essential.
 

20 June Alert Notice 485: AG Dra monitoring requested for multiwavelength campaign

June 20, 2013: Dr. Andrea Dupree (Harvard-Smithsonian Center for Astrophysics) has requested AAVSO monitoring of the symbiotic variable AG Draconis from now through at least September 2013 for correlation with upcoming Chandra x-ray and HST ultraviolet observations.

13 June Citizen Sky Research Paper Published

A science education research paper, 'Changes in participants' scientific attitudes and epistemological beliefs during an astronomical citizen science project', written by Aaron Price and Hee-Sun Lee has been published in the Journal of Research in Science Teaching (JRST).

12 June Solar Bulletin - Volume 69, Number 5

The May 2013 Solar Bulletin is now available.

12 June JAAVSO 41.1 is published

JAAVSO Volume 41, Number 1, 2013, is published

http://www.aavso.org/jaavso-published-volumes

12 June Special Notice #359: OR And monitoring needed for HST/COS campaign

June 12, 2013: Among the research options in the HST/COS CV campaign underway are observing two VY Scl stars in the low state, the only time the white dwarf is observable. OR And is now in its low state, at 18th V magnitude as of 2013 June 11 UT.

12 June Special Notice #358: BD Pav obs critial tonight

June 12, 2013: Based on your observations, the HST/COS team will be making the final decision tomorrow morning (2013 June 13) whether to observe BD Pav.

Your observations tonight (June 12/13) are CRITICAL. HST/COS is scheduled to observe the eclipsing dwarf nova BD Pav:

BD Pav 2013 June 14 04:40:42 through 09:46:09 UT


If you can observe BD Pav, a few V-band snapshots would be sufficient and very helpful. BD Pav is 15.4V at minimum and 12.4V at maximum.

07 June Special Notice #357: BD Pav next HST COS target followed by QZ Ser

June 7, 2013: Further to AAVSO Alert Notice 471 (http://www.aavso.org/aavso-alert-notice-471) and AAVSO Special Notice #356 (http://www.aavso.org/aavso-special-notice-356), HST/COS is scheduled to observe the eclipsing dwarf nova BD Pav:

BD Pav 2013 June 14 04:40:42 through 09:46:09 UT

06 June SAS Newsletter

The latest newsletter of the Society for Astronomical Sciences (SAS) with informantion on their most recent meeting - including a mention of our own Mike Simonsen!

06 June New eJAAVSO preprint: Very Short-Duration UV–B Optical Flares in RS CVn-type Star Systems

ej236: "Very Short-Duration UV–B Optical Flares in RS CVn-type Star Systems" by G. A. Vander Haagen

www.aavso.org/ejaavso

04 June Special Notice #356: V1108 Her obs urgent TONIGHT and new date for BD Pav

June 4, 2013: Further to AAVSO Alert Notice 471 (http://www.aavso.org/aavso-alert-notice-471) and AAVSO Special Notice #355 (http://www.aavso.org/aavso-special-notice-355), HST/COS is scheduled to observe the WZ Sge-type cataclysmic variable V1108 Her:

V1108 Her  2013 June 6 09:32:19 through 13:42:14 UT

04 June Alert Notice 484: Nova Sco 2013 = PNV J17335943-3606216

June 4, 2013:

Event: Nova Sco 2013 = PNV J17335943-3606216

Discovered by: Koichi Nishiyama (Kurume, Japan) and Fujio Kabashima (Miyaki, Japan)

Discovery Magnitude: unfiltered CCD magnitude 11.1, from two 40-s unfiltered CCD frames, using a 105-mm f/4 camera lens (+SBIG STL6303E camera)

Discovery date: 2013 June 03.6146 UT

Coordinates: R.A. = 17 33 59.44, Decl.= -36 06 20.7 (2000.0)

04 June Visual Observing Manual in French - 2013 edition

The French version of the newly revised Manual for Visual Observing of Variable Stars - Manuel pour l'observation visuelle des étoiles variables - is now available for download here:

http://www.aavso.org/visual-observing-manual-french

31 May Special Notice #355: V1108 Her next HST COS target followed by BD Pav

May 31, 2013: Further to AAVSO Alert Notice 471 (http://www.aavso.org/aavso-alert-notice-471)and AAVSO Special Notice #354 (http://www.aavso.org/aavso-special-notice-354), HST/COS is scheduled to observe the WZ Sge-type cataclysmic variable V1108 Her:

V1108 Her  2013 June 6 09:32:19 through 13:42:14 UT

PLEASE NOTE THAT THE DATE HAS BEEN REVISED FROM SPECIAL NOTICE #354.

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