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.
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.
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:
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.
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
