Special Notice #177: Observing Campaign on the Secondary Eclipse of zeta Aurigae
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AAVSO Special Notice #177
Observing
eclipsing binary
Special Notice #35: Eclipse of HD74057
February 24, 2007
Don Davies discovered a 7th magnitude eclipsing binary (GSC 02484-00592, HD74057, VSX J084246.2+315145) in May, 2005, announced on our discussion group (posting 5/27/2005), and subsequently published in Peremennye Zvezdy:
http://www.astronet.ru/db/varstars/msg/1212913
The coordinates are
08:42:45.900 +31:51:41.00 J2000
and the approximate magnitude is V=7.18, with (B-V) = 0.56
Alert Notice 155: Nova Cygni 1992 [V1974 Cyg] AND Nova Sagittarii 1992 [V4157 Sgr] AND Supernova 1992G in NGC 3294 AND Predicted eclipse of the very long period eclipsing binary 2205+55 EE Cephei
THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS
25 Birch Street, Cambridge, MA 02138 USA
BITNET: aavso@cfa SPAN: cfa::aavso
INTERNET: aavso@cfa.harvard.edu
Tel. 617-354-0484 FAX 617-354-0665
AAVSO ALERT NOTICE 155 (February 20, 1992)
NOVA CYGNI 1992 [V1974 CYG]
Alert Notice 540: Secondary eclipse of b Persei is underway
March 10, 2016: Further to AAVSO Alert Notice 537, the anticipated secondary eclipse of b Per is underway, according to information from campaign astronomer Dr. Donald F. Collins. Dr. Collins writes:
Special Notice #406: KIC 02856960 entering eclipse window
August 7, 2015: Further to AAVSO Alert Notice 525, we are entering the critical period of observations for KIC 02856960. Time series observations are urgently requested for this eclipsing binary beginning immediately (2015 August 07, JD 2457242) and continuing for the next five days, through the end of 2015 August 12.
Alert Notice 525: Observing Campaign on KIC 02856960
July 31, 2015: The AAVSO requests time-series observations of the eclipsing binary system KIC 02856960 beginning immediately, with intensive coverage urgently requested during the window of 2015 August 8.0 through August 12.0. Observations are requested on behalf of an international campaign coordinated by Dr.
Special Notice #394: Observations of b Persei urgently requested
January 12, 2015: Photometry by P. Benni (AAVSO observer code BPAD; Massachusetts, United States), D. Collins (CDK; North Carolina, United States), F. Campos (CFRA; Catalunya, Spain), and F. Melillo (MFR; New York, United States) suggest that b Persei may have entered eclipse around JD 2457033.6 (2015 January 11.1 UT). Time-series photometric observations of this bright star are urgently requested beginning immediately, and continuing for the next two weeks (through at least 2015 January 26 UT) and possibly beyond.
Alert Notice 506: Alpha Com eclipse observing campaign
January 16, 2015: THIS CAMPAIGN HAS BEEN CANCELLED. PLEASE SEE AAVSO SPECIAL NOTICE #395 FOR DETAILS.
December 5, 2014: Drs. Matthew W. Muterspaugh and Gregory W. Henry (Tennessee State University) have requested AAVSO observers' assistance in monitoring the possible Algol-like binary star alpha Com before, during, and after the eclipse they have predicted for mid-to-late January 2015.
Alert Notice 504: Epsilon Aur monitoring during predicted pulsation phase
Note: A thread for this campaign has been created in the AAVSO Campaigns and Observation Reports discussion forum: https://www.aavso.org/eps-aur-monitoring
CONTINUED AT LEAST THROUGH 2021 - Elizabeth O. Waagen, 17 April 2020
September 17, 2014: Dr. Robert Stencel (University of Denver Astronomy Program) has requested that AAVSO observers monitor epsilon Aurigae from now through the end of the observing season.
Alert Notice 321: Multicolor CCD campaign for AS 325 to support Spitzer observations
July 13, 2005
Summary
We request nightly BVRI CCD observations of the symbiotic eclipsing binary star AS 325 until December 1, 2005. The goal of the campaign is to determine the nature of this enigmatic system by looking for changes in color during the current eclipse and also to support upcoming observations with the Spitzer Space Telescope planned for September.