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Further to AAVSO Alert Notice #525, we are entering thecritical period of observations for KIC 02856960. Time series observations are urgentlyrequested for this eclipsing binary beginning immediately (2015 August 07, JD2457242) and continuing for the next five days, through the end of 2015 August12. KIC 02856960 is at an approximate magnitude of V=16.0, with the expectedampltidue of the eclipse being less than 0.08 magnitudes. The optimal S/N of observations is around100, but observers are asked to obtain as high a signal to noise as possiblewith net exposure times less than 10 minutes. If individual observations do not reach SN of 100, please submit themanyway, and they will be combined by the researchers during analysis. Observations in any of Ic, V, Rc or clearfilters are encouraged; multicolor observations are only requested if the totalset of filtered images can all be obtained within a single 10-minute window,otherwise only one filter should be used.
KIC 02856960 is located at the following (J2000)coordinates:
RA:19 29 31.52 , Decl: +38 04 35.9
The eclipse is predicted to show very complex structureover the next several days, and observations from all longitudes are urgentlyrequested. **Observers in central andeastern Asia and the Pacific Rim are especially encouraged to participate**along with all of our observers in North America and Europe.
Charts for KIC 02856960 may be generated via AAVSO's VSP:
A comparison star sequence is available; observers areencouraged to use the two comparisons labeled "148" and"151" closest to the variable if possible.
Please submit all observations promptly to the AAVSO viathe WebObs feature of the AAVSO website:
Please use the name "KIC 02856960" whensubmitting all observations.
This AAVSO Special Notice was prepared by M. Templeton.
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發表於 2015-8-8 08:57:08