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Solar Bulletin - Volume 73, Number 04

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

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

Solar Observing Guide - in French

Thanks to a wonderful volunteer effort by Bernard Candela, we now have available a French translation of The AAVSO Solar Observing Guide!  Many thanks Bernard!

 

Alert Notice 576: Nova in Ophiuchus - TCP J17394608-2457555

May 11, 2017

Event: Nova in Ophiuchus

Discovered by: Koichi Itagaki (Yamagata, Japan)

Discovery magnitude: magnitude 13.6 (CCD, unfiltered, using 0.20-m f/3.0 reflector + CCD)

Special Notice #429: V694 Mon (MWC 560) spectroscopy requested

May 2, 2017: Further to AAVSO Alert Notice 538, the campaign from 2016 on V694 Mon (MWC 560) has been continued, but with different requirements. Photometry is no longer specifically requested on a regular basis (although ongoing observations that do not interfere with other obligations are welcome). Spectroscopy on a cadence of a week or two is requested to monitor changes in the disk outflow. V694 Mon is presently nearing opposition, but the request for spectroscopy continues until further notice.

Alert Notice 575: Monitoring of Swift J1357.2-0933 (CRTS J135716.8-093238) requested

April 28, 2017: Dr. Gregory Sivakoff (University of Alberta) has requested AAVSO observers' assistance in monitoring Swift J1357.2-0933 (CRTS J135716.8-093238) during its current outburst.

Introducing... The AAVSO Solar Observing Guide

Thanks to a lot of hard work on the part of long-time sunspot observer Frank Dempsey and his team, the AAVSO is proud to announce the publication of a brand new observing manual designed to help introduce observers to the art and science of solar observing.

The AAVSO Solar Observing Guide

Click the link above to read more and download your copy - free of charge.

 

 

Alert Notice 574: Monitoring of EPIC 204278916 requested

April 25, 2017: Dr. Carlo Manara (ESA Science and Technology SCI-S, the Netherlands) and colleagues have requested AAVSO assistance in monitoring the young, disk-bearing low-mass (M type) pre-main-sequence star EPIC 204278916 (2MASS J16020757-2257467).

Solar Bulletin - Volume 73, Number 03

 

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

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

Alert Notice 573: V2492 Cyg monitoring requested in support of XMM observations

April 6, 2017 : Dr. Nicolas Grosso (CNRS, Observatoire Astronomique de Strasbourg) has requested AAVSO assistance in monitoring the young eruptive star (FUOR type) V2492 Cyg from the optical to the infrared in support of X-ray observations with XMM-Newton scheduled for 2017 April 18 UT.

The XMM observations will take place: 2017-04-18 03:27:07 UT - 2017-04-18 14:17:07 UT.

AAVSO Newsletter 72, April 2017, is published

AAVSO Newsletter 72, April 2017 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.

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