Comments

Either the period should be adjusted to a shorter value (because transits are occurring ~15 minutes early in July) or there's an interesting TTV (produced by another planet in a resonant orbit). An investigation by Alonso et al (link) of precision measurements of 80 consequtive transits (139 days) by CoRoT showed no evidence for TTV greater than ~10 seconds. This result was obtained by analyzing LC data in a way that minimized stellar activity effects; when the data were processed using a simple LC fitting procedure the greatest TTV anomaly was ~20 seconds. Therefore it is unlikely that the TTV of this amateur data is real.

Basic data

    RA = 19:27:06.5, DE = +01:23:02
    Season = July 14
    V = 12.57
    HJDo = 4237.53562 ± 0.00014
    P = 1.7429964 ± 0.0000017 days
    Depth = 35.3 ± 0.3 mmag
    Length = 2.266 ± 0.013 hr

Table of amateur observations

 
Let's not take the slope seriously until there's more data.

Light Curves - Amateur

8804roe1




8729roe3


8729roe2


8606ayiC



8607klid


Light Curves - Professional


Copied from discovery paper: Alonso et al, 2008

Finder Charts

References

Discovery paper: Alonso et al, 2008a
TTV & Secondary Transit Search: Alonso et al, 2008b

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WebMaster: Bruce L. Gary.  Nothing on this web page is copyrighted. This site opened:  May 08, 2008.  Last Update:  August 06, 2008.