HD 189733
AXA Light Curves

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

Comments on LCs on this web page

    Although there aren't many LCs it appears that mid-transits might be coming slightly late.
    The z-band depth may be 25 mmag, but V, R, and C-band depths differ (w/o a pattern).
    The z-band length may be 1.74 hr, but most V, R and C-band lengths are shorter.

Basic data
    RA = 20:00:43.7, Decl = +22:42:37
    Season = July 21
    V = 7.67, B-V = 1.08
    HJDo = 3988.80336
    P = 2.2185733 day
    Depth = 25 mmag (z-band)
    Length = 1.74 hr

Table Summary of transit measurements


 Date
 Filter
 Observer
 Depth [mmag]
 Length [hr]
 UT mid
 JD mid
 HJD mid
 HJD ephem
 dt [min]











7
 2007.11.05
 R
 Srdoc
 29
 1.70
 19.980
 4410.3325
 4410.3322
 4310.3322
 -0.1
6
 2007.09.29
 C
 Cruz
 27
 1.74
 02.74
 4372.6142
 4372.6165
 4372.6162
 +0.4
5
 2007.08.29
 V
 Orlando
 26
 1.6
 01.30
 4341.5542 4341.5580 4341.5565 +2.2
4
 2007.07.28
 R
 Srdoc
 29
 n/a
 n/a
 n/a
 n/a
 4310.4965
 n/a
3
 2007.07.28
 CLR
 Naves
 29
 1.69
 23.825
 4310.4927
 4310.4970 4310.4965 +0.7
2
 2007.04.22
 V
 Levin
 16.5
 1.7?
 09.080
 4212.8783
 4212.8777
 4212.8792
 -2.2
1
 2006.09.16
 R
 Gregorio
 30
 1.69
 23.01
 3995.4588
 3995.4618 3995.4591
 +3.8


Transit light curves





Thanks, Isaac Cruz, for creating this LC.


First attempt with a 8-inch telescope and V-band filter, by Steve Orlando (New York). Take note "beginners," you can do it too!


First submission for Gregor Srdoc! Good work! Same depth as measured by Ramon Naves in Spain for same transit.


Note the 2-second exposure time. Mid-transit "on schedule"!


Note the excellent 2-mnute RMS!


Looks like the observer's clock was set 1 hour off. If we subtract 1 hour from the observation times we'd be able to say that mid-transit was ~3 min late.

Out-of-Transit Light Curves


Just as ingress was expected a thunderstorm began! At least the 4.5 hours of OOT data is featureless.

Finder Image


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WebMaster: Bruce L. Gary.  Nothing on this web page is copyrighted. This site opened:  August 10, 2007.  Last Update:  November 07, 2007