News and Announcements
|19 August||Nova Del 2013||
Below is a listing of the various AAVSO publications, posts, and articles on the new bright nova in Delphinus. Use the links on the right side of the page to find out more about the AAVSO and how you can get in on the action.
|16 August||AAVSO Alert Notice 489: Nova Delphini 2013 = PNV J20233073+2046041||
August 16, 2013
|16 August||Binocular Sequence and Charts Now Available for Nova Del 2013||
Due to the very bright eruption of Nova Del 2013, we have created a binocular sequence specifically for this nova that can be plotted using the Binocular Chart option on the chart plotter (VSP).
For best results specify a field of view of 900 arc minutes (15 degrees) and a limiting magnitude of 7 and click on the Binocular Chart option. This will produce an uncluttered chart with a sequence from 6.9 - 3.5V for use with binoculars. Or you may simply download the chart attached to this page.
|13 August||Solar Bulletin - Volume 69, Number 7||
The July 2013 Solar Bulletin is now available.
|12 August||New eJAAVSO preprint: Data mining the Ogle-II I-band database...||
ej240: "Data Mining the Ogle-II I-band Database for Eclipsing Binary Stars" by Marco Ciocca
|05 August||AAVSO Professional Survey for 2013||
AAVSO Councillor Kevin Paxson has completed and presented the results of the AAVSO's survey of the professional astronomical community. The AAVSO solicited participation from professional astronomers in an online survey early this year, and the results are now available in both raw and summarized form, with commentary and analysis from Kevin. The results were presented at the 2013 Spring Meeting of the AAVSO, and the final reports are now avail
|01 August||Alert Notice 488: Observations of AA Tau requested to schedule XMM-Newton||
August 1, 2013: Dr. Hans Moritz Guenther (Harvard-Smithsonian Center for Astrophysics) has requested nightly observations of the classical T Tauri star AA Tau in order to schedule x-ray observations with XMM-Newton that have been planned for between 2013 August 15 and September 15.
|01 August||Search for New AAVSO Director Underway!||
From: Kevin B. Marvel, AAVSO Director Search Committee Chair and Executive Director, American Astronomical Society
|26 July||Special Notice #368: Bright transient in M74 - PSN J01364816+1545310||
July 26, 2013: Patrick Schmeer (SPK, Bischmischeim, Germany) reports via baavss-alert and vsnet-alert that a bright (12.4 U) transient, discovered in M74 (NGC 628) on 2013 July 25.80 UT, has been announced on the CBAT Transient Objects Confirmation Page. The discover's name does not appear there. The presence of the transient has been confirmed by Andrzej Pigulski on 2013 July 27 0:00 UT in vsnet-alert 16057.
|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: