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Solar Bulletin - Volume 74, 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

JAAVSO Volume 46 Number 2, 2018 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 46, Number 2, 2018

Articles in This Issue

Alert Notice 658: EC 21178-5417 being observed with Chandra

December 3, 2018: Further to AAVSO Alert Notice 652, Dr. Koji Mukai (NASA-Greenbelt Space Flight Center) informs us that EC 21178-5417, one of the novalike variables in his target list, will be observed with Chandra on 2018 December 5 20:18 UT - December 6 01:00 UT.

LPV of the Month December, 2018

The Extreme Miras

AAVSO Membership Meeting November 17th, 2018

Recordings of the AAVSO Membership Meeting November 17th, 2018

Lowell Observatory, Flagstaff Arizona

Secretary's Report - Gary Walker

Treasurer's Report - Bob Stephens

Alert Notice 657: HerbigAeBe stars need monitoring for Chandra observations

November 21, 2018: Dr. Hans Moritz Guenther (MIT; Kavli Institute for Astrophysics and Space Research) and colleagues have requested AAVSO observers' assistance in monitoring several HerbigAeBe stars in support of upcoming observations scheduled with Chandra.

Solar Bulletin - Volume 74, Number 10

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

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

Alert Notice 656: Chandra observation date revised for XZ Tau and HL Tau

Note: Edited November 20, 2018, to clarify the links to the forum threads for this campaign. - E. Waagen

November 7, 2018: Further to AAVSO Alert Notice 654, the date and time of the Chandra observations of the T Tauri stars XZ Tau and HL Tau scheduled for 2018 November 15 have been revised to November 11 and 12.

Dr. David Principe (MIT) informs us that Chandra is now scheduled to observe the targets on:

LPV of the Month November, 2018

S Ori

Deep Red image of S Ori from SDSS

Overview

S Ori is a Mira type Long Period Variable (LPV).  It has an Oxygen rich spectrum range of M6.5e-M9.5e.

It’s position in the sky is at 05 29 00.90  -04 41 32.8 which makes it viewable from both the northern and southern hemisphere.  S Ori is a “winter” star in the northern hemisphere so it’s now in “season. 

Alert Notice 655: Anticipated secondary eclipse of b Persei by its third star in November 2018

Note: Text revised October 30 to include date and time on which the predicted eclipse window is centered. It was further revised November 2 to correct the SAO number of b Per and to correct the position of the check star. - E. O. Waagen

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