eclipsing system

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

Alert Notice 570: NR TrA (Nova TrA 2008) monitoring in support of XMM observations

March 7, 2017 : Dr. Fred Walter (Stony Brook University) has requested AAVSO observers' assistance in monitoring NR TrA (Nova TrA 2008) in support of upcoming XMM Newton observations. The XMM observations will take place 2017 March 13 06:21 through March 14 10:34 UT.

Alert Notice 537: Observations of a secondary eclipse of b Persei requested

February 26, 2016: Dr. Donald F. Collins (AAVSO member, Swannanoa, NC), Dr. Robert Zavala (US Naval Observatory, Flagstaff Station), and Jason Sanborn (Lowell Observatory) request high time-resolution observations of the bright eclipsing star b Persei (not beta) during an expected secondary eclipse of the third star of the system as it is expected to pass behind the close orbiting stars of the system in the two weeks centered on March 7, 2016. Dr. Collins provides the information below.