News and Announcements
|26 July||Special Notice #367: Outburst of the UGWZ star UZ Bootis||
Carey Chiselbrook (CCY; Georgia, United States) reports via the AAVSO Forums that the WZ Sge-type variable UZ Bootis is in outburst. It was observed visually at magnitude 12.8 on 2013 Jul 26 02:00 UT (JD 2456499.58194). The outburst was confirmed by Walter MacDonald (MDW; Ontario, Canada) imaged the field and found UZ Boo at V=12.69 03:25 UT (JD 2456499.6394). Observations of UZ Bootis -- both visual estimates and CCD time series -- are encouraged throughout the outburst.
|24 July||Special Notice #366: Symbiotic variable AS 270 brightening||
July 24, 2013: AAVSO observer Steve O'Connor (OCN; St. George's, Bermuda) reports a possible brightening episode of the symbiotic variable AS 270. O'Connor reports the star at V=12.75+/- 0.02 on 2013 July 24.535 (JD 2456498.035). The most recent prior observation reported to the AAVSO International Database (M. Linnolt, LMK; Ocean View, Hawaii, United States) had AS 270 at m(vis)=14.1 on 2013 July 13.390 (JD 2456486.890), suggesting a rise of more than one magnitude in less than two weeks.
|19 July||Alert Notice 487: Supernova 2013dy in NGC 7250 = PSN J22181760+4034096||
July 19, 2013
|19 July||Special Notice #365: Correction to AAVSO Special Notice #364||
July 19, 2013: In AAVSO Special Notice #364 (http://www.aavso.org/aavso-special-notice-364)
|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:
|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:
|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.
|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:
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:
|03 July||The July AAVSO Newsletter is published||
AAVSO Newsletter 57 - July 2013
|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:
|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:
|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:
|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
|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.
|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:
|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