Came early, whereas a week earlier it came late..
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This is a difficult exoplaent to observe because it's a double star with separation = 11"arc. You need really good seeing for use of a photometry aperture that restricts flux measurements to just the exoplanet star (~0.5 mag fainter)
It's curious that one of the two transits is 15 min early and the other is 15 min late.
Basic Data
RA = 22:57:46.8, Decl = +38:40:30
Season = September 09
V ~ 10.2, B-V = 0.7; B~10.9, V~10.2, R~9.81, I ~ 9.56 (for combined flux of stars A and B: B~9.8, V~9.1, R~8.77, I = 8.52)
HJDo = 39997.79258(29), Winn et al, 2007
P = 4.46543(14) day, Winn et al, 2007
Depth = 14.0 ± 0.5 mmag (z-band), Winn et al, 2007
Length = 2.65 ± 0.02 hr (z-band), Winn et al, 2007
Table Summary of Transit Light Curves
| Date |
Filter |
Observer |
Depth [mmag] |
Length [hr] |
UT mid |
JD mid |
HJD mid |
HJD ephem |
dt [min] |
| 2007.09.15 |
CLR |
Vanmunster |
14 ± 3 |
2.9 ± 0.3 | 23.200 |
4359.46667 | 4359.47098 |
4359.48136 |
-15.0 |
| 2007.09.06 |
CLR |
Naves |
13 ± 3 |
2.73 ± 0.3 | 25.365 |
4350.55688 |
4350.56103 |
4350.55078 |
+14.8 |
Came early, whereas a week earlier it came late..
Transit was late. Depth is lower than for R-band, probably because CLR
filter is bluer than R (& limb darkening will produce lower depth
at bluer bands if exoplanet transit chord is close to star center).
Length agrees. Good job for a 12-inch and using
10-second exposure times (with associated low duty cycle).
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WebMaster: Bruce L. Gary. Nothing on this web page is copyrighted. This site opened: September 08, 2007. Last Update: February 09, 2008