Observation and analysis of X181590 on Nov. 14, 2010 (UTC)
Nov. 27, 2010
Kazuhisa Miyashita
The catalogue's detail of R3230 is as follows.
Catalogue details
Catalogue details
XZ 181590
RA = 22 3 49.6241 PM = -0.00145s
Dec = - 7 49 59.709 PM = -0.0327"
Mv = 11.08, Mb = 12.72, Mr = 10.22 Spectrum __ Dia: .0003" [Estimated]
Star is the primary of the following pair
Name Cmpt Yr1 Yr2: PA1 PA2 : Sep1 Sep2 : Mag1 Mag2: #1 #2 mean
RST4704 1939 1991: 146.0 147.0: 1.900 1.800: 11.34 11.46: X181590 ------
WDS Discoverer codes
RST Rossiter, R.A.
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Light curve and explanation
This is a faint star occultation, and the light curve scattered with air scintillation and CCD's noise.
The FFT low pass filtre was applied to reduce these noise. As a result, a rather clear step is obtained.
Comments from Brian Loader IOTA double star coordinator:
It does look that there is a step there, rather hidden in the noise.
The expected step time was 6.52 seconds, so in reasonable agreement with
your observation. Again it would be good to get further observations to
confirm this. There appears to be one or two possible opportunities in
2011, but the magnitude is likely to make observing difficult with any
telescope less than 30cm, or at brighter phases of the moon.
Miyashita's observation
Raw light curve.
FFT low pass filtre applied.
Calculation of component's magnitude.
