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eclipse

Special Notice #333: Eclipse underway in b Per and photometry needed urgently

February 6, 2013: According to photometry provided by Don Collins (CDK, Swannanoa, NC), the eclipse in the b Per system (HD 26961), predicted for around 2013 January 25, is underway now and began February 4-5. Photometry - multicolor if possible - is urgently needed now to cover the rest of this eclipse, which may last for up to four days altogether, and see post-eclipse behavior of the system.

Alert Notice 476: Multicolor photometry of triple system b Per requested

January 4, 2013: Dr. Bob Zavala (U.S. Naval Observatory, Flagstaff) has requested AAVSO assistance in obtaining multicolor photometry of the bright triple system b Per in order to prepare for and detect a possible eclipse of the AB components by the C component predicted for 2013 January 23. At 4.5V, b Per, which is also a radio source, is an excellent target for photoelectric photometrists and DSLR observers.

Alert Notice 464: Observers requested for Jovian Extinction Events (JEE2012)

July 5, 2012:  Scotty Degenhardt (Santa Fe, NM), a pioneer in the use of video for timing eclipses of solar system and stellar objects and a research member of the International Occultation Timing Association (IOTA), has informed the AAVSO of a research project he and colleagues are working on: modeling the Jovian dust field, moon atmospheres, and Io’s Torus through Jovian Extinction Events (JEE). He has invited AAVSO observers to participate by observing these Jovian extinction events and reporting their observations.

Alert Notice 462: Monitoring of J1407 for next extrasolar ring system transit

Note: A thread for this campaign has been created in the AAVSO Campaigns and Observation Reports discussion forum:  https://www.aavso.org/j-1407-monitoring-campaign

This campaign has been continued through at least 2020. Please continue to monitor J1407, although the level of coverage may be somewhat reduced.  -  Elizabeth O. Waagen, 17 April 2020

CONTINUED THROUGH 2017

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