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Special Notice #389: Possible Supernova in NGC 4303 (M61) - PSN J12215757+0428185

October 29, 2014: The CBAT Transient Object Confirmation Page (follow-up page = http://www.cbat.eps.harvard.edu/unconf/followups/J12215757+0428185.html) reports the discovery of a possible supernova in M61 (NGC 4303) by Koichi Itagaki (Yamagata, Japan) on 2014 Oct. 29.8376 UT at magnitude 13.6 CCD unfiltered.

Coordinates:  R.A. 12 21 57.57   Dec. +04 28 18.5   (2000.0)

Alert Notice 505: Monitoring of Northern dwarf novae for radio jets campaign

October 24, 2014: Ms. Deanne Coppejans (PhD candidate, Radboud University Nijmegen (Netherlands) and University of Cape Town) and colleagues have requested AAVSO observer assistance in monitoring several dwarf novae in support of their campaign to observe them in outburst with the Very Large Array (VLA) to search for radio jets.

Silicon and Glass

Everyone’s familiar with the term ‘bricks and mortar’. Many donors prefer to give to specific projects or programs that result in well-defined, tangible goods, such as the new wing of a building, a playground, or furniture and athletic equipment for a recreation center.

Special Notice #388: Outburst of VSX J213806.5+261957

October 23, 2014: Carey Chiselbrook (Georgia, United States; AAVSO observer code CCY) observed the WZ Sge-type dwarf nova VSX J213806.5+261957 in outburst at a visual magnitude of 9.7 on 2014 October 22.0590 (JD 2456952.55903). Prior to the outburst detection,  the last observation (also by CCY) indicated the star was not in outburst less than 24 hours prior (mvis < 13.8 at JD 2456951.6326).

Charts and Sequences Update October 22, 2014

The following objects have had new or revised sequences added since the end of May. Please be sure you are using the most up to date charts and sequences if you observe any of these objects.

A complete listing of new and revised sequences for 2014 is available here.

Solar Bulletin - Volume 70, Number 09

The September 2014 Solar Bulletin is now available. 
Please visit the Solar Bulletinweb page to download your copy: 
http://www.aavso.org/solar-bulletin

AAVSO Newsletter for October 2014 is published

AAVSO Newsletter 62, October 2014 is now available to members

The AAVSO Newsletter is a periodic, general forum that supports our various observing programs with lists of new targets, observing programming ideas, and general information that spans a wide area of interest. Guest writers contribute pieces that can range from current events to book reviews.

Alert Notice 506: Alpha Com eclipse observing campaign

January 16, 2015:  THIS CAMPAIGN HAS BEEN CANCELLED. PLEASE SEE AAVSO SPECIAL NOTICE #395 FOR DETAILS.

 

December 5, 2014: Drs. Matthew W. Muterspaugh and Gregory W. Henry (Tennessee State University) have requested AAVSO observers' assistance in monitoring the possible Algol-like binary star alpha Com before, during, and after the eclipse they have predicted for mid-to-late January 2015.

New eJAAVSO preprint: Amplitude variations in pulsating yellow supergiants

ejaavso 283

Amplitude Variations in Pulsating Yellow Supergiants

   pdf

John R. Percy
Rufina Y. H. Kim

Department of Astronomy and Astrophysics, University of Toronto, Toronto, ON M5S 3H4, Canada

Received June 12, 2014; revised July 24, 2014; accepted July 24, 2014

Abstract

Alert Notice 504: Epsilon Aur monitoring during predicted pulsation phase

September 17, 2014: Dr. Robert Stencel (University of Denver Astronomy Program) has requested that AAVSO observers monitor epsilon Aurigae from now through the end of the observing season.

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