HD 15407A

October 2, 2015:  Further to AAVSO Alert Notice 511, issued in March 2015, Dr. George Rieke (University of Arizona) and colleagues' campaign to monitor planetary debris disks for variability using the Spitzer Space Telescope continues. AAVSO observations are requested to rule out variability of the stars themselves.

The second segment of observations of the four targets takes place from now into January 2016 according to the schedule below.

Campaign continued through 2017 at least. Also, campaign updated in  AAVSO Special Notice #408 (20151002).

March 13, 2015: Dr. George Rieke (University of Arizona) and colleagues have requested AAVSO assistance in monitoring four stars with developing planetary systems. The targets are RZ Psc, HD 15407A, V488 Per, and HD 23514. This campaign is similar to the one conducted in 2013 (see AAVSO Alert Notice 482).

October 24, 2013: HD 15407A is one of the targets in the current observing campaign by Huan Meng and Dr. George Rieke (runs through December 2013; see AAVSO Alert Notice 482). The very nearby star marked 96 (HD 15407B, AUID 000-BKY-170) was selected as the comparison star for this target. However, it has been found that the published magnitude of this star is questionable, and the astronomers have withdrawn it as the comparison.

April 4, 2013: Huan Meng and Dr. George Rieke (University of Arizona) have requested AAVSO assistance in monitoring three bright stars with developing planetary systems. The stars have been observed with NASA's Spitzer Space Telescope to have varying levels of dust in the circumstellar disk. These varying levels are thought to be produced through collisions among the asteroid-size debris in the disk.

April 3, 2013:  Huan Meng and Dr. George Rieke (University of Arizona) have requested AAVSO assistance in monitoring three bright stars with developing planetary systems. The stars have been observed with NASA's Spitzer Space Telescope to have varying levels of dust in the circumstellar disk. These varying levels are thought to be produced through collisions among the asteroid-size debris in the disk.