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Alert Notice 565: YZ Cnc Chandra observing campaign

December 19, 2016: Dr. Christian Knigge (University of Southampton) and colleagues have requested AAVSO coverage of the SU UMa-type dwarf nova YZ Cnc in support of Chandra X-ray observations to be carried out via a Target of Opportunity (TOO) triggering when the system is in a suitable outburst.

YZ Cnc has normal outbursts about every 7-10 days, and superoutbursts about every 100-110 days. The astronomers are planning to use a superoutburst to trigger the TOO observations.

Solar Bulletin - Volume 72, Number 11

The November Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy: https://www.aavso.org/solar-bulletin

The November SID Data report is available here: https://www.aavso.org/sid-database

2017 JD Calendar is now available

The 2017 Julian Day calendar is now available for your viewing or downloading pleasure.

 

JAAVSO Volume 44 Number 2 2016 is published

eJAAVSO

http://www.aavso.org/apps/jaavso/volumes/

The printed version of this issue will be available soon. Please watch for the announcement on our main web page.

The Journal of the American Association of Variable Star Observers
Volume 44, Number 2, 2016

Editorial

Visual Observing Manual in German

A German translation of the AAVSO Manual for Visual Observing of Variable Stars is now available.

Many, many thanks to Ilka Petermann who volunteered a lot of time and effort to produce this translation.

CCD Photometry Guide in French

Thanks to a lot of hard work by a team of volunteers from both sides of the Atlantic working together, we now have a French translation of the AAVSO Guide to CCD Photometry.  You may download this Guide (free-of-charge) from here.

We would like to send our sincere thanks to:

Manon Bouchard (Canada)
Pierre Cheyssac (GAPRA, France)
Jean-Bruno Desrosiers (Canada)
Jean-Claude Mario (GAPRA, France)
Jean-Bernard Pioppa (GAPRA, France)
Florian Signoret (GAPRA, France)

Special Notice #426: Blazar CTA 102 (4C 11.69) in very bright outburst

December 1, 2016: The blazar CTA 102 (4C 11.69) has been in an active state in gamma-ray and optical wavelengths since 2015. During 2016, it has had numerous flaring episodes, particularly since late October. It is presently in an unprecedentedly bright optical state, and showing substantially increased emission in gamma-ray and near-infrared wavelengths.

Charts and Sequences Update November 2016

The charts and sequences team has been busy over the last several months preparing new sequences for newly discovered objects and revised sequences intended to improve existing sequences. If you observe any of these objects please update your charts and/or sequences. A file in .xlsx format is attached below for your convenience.

 

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