HD 209458
AXA Light Curves

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    Basic data
    Table summary of transit measurements
    Transit LCs
    OOT LC
    Finder image

Comments on LCs on this web page

The period should be well established since this is the first bright transiting exoplanet with 8 years of transit observations. Probably there are fewer amateur observations of this BTE because by the time most amateurs began observing BTEs this target was well-observed by the professionals. The only value in observing this object is to evaluate how often "systematic errors" are present in amateur light curve data and my model fitting of it.

Basic data - This section updated 2009.09.11
    RA = 22:03:10.8, Decl = +18:53:04
    Season = Aug 24
    V = 7.66,
B-V = 0.59
    HJDo = 2826.628521
    P = 3.52474859 day
    Depth = 18.3
± 0.8 mmag (RBI bands)
    Length = 2.97
± 0.05 hr
    Fp = 0.30 ± 0.03, F2 = 0.80 ± 0.10

Summary of Transit Measurements This section updated 2009.09.11

The ephemeris for this exoplanet is so well determined, by professionals, that it will never be improved by us amateurs. But it can serve to show how often amateur data is so affected by systematics that outliers are produced.




Transit Light Curves

LCs in this section have not been included in table & plots (above)


LCs below here have been included in table & plots (above)



9831SG2  I see a possible starspot before egress, but then I also see similar features during the OOT portions. It would be nice to have a second observer for this event.








Note the high air mass at the end.

Out-of-Transit Light Curves

Finder Image

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WebMaster: Bruce L. GaryNothing on this web page is copyrighted. This site opened:  October 26, 2007 Last Update:  2009.11.01