Aktualny czas UTC:

AOTA – wyznaczenie momentów zjawisk zakryciowych z krzywych LC

SharpCap stempluje na końcu ekspozycji klatek (M. Zawilski)

Anyway, this detection is more or less affected by a lot of noise. So I 
suggest you to label it as UNCERTAIN (not POSITIVE) in the report.
Notice that the resulting chord is compatible with Maciej's observation 
but is not self sufficient. Practically, it will considered as a 
positive in Occult database with an "uncertain" flag.
(614) PIA- About the time stamping in Tangra: when Tangra asks you for 2 times to be entered manually at the end of the photometry, 
you have to pick the time common to both fields (in field mode) or the time which is not blurred (in frame mode). 
But in the case of the TIM-10 VTI, you have to add +0.02 sec to the time above (this is the only VTI which requires this correction). 

(614) PIA - Once in AOTA, you have to bin the data before analyzing the light curve. 
The help for this is in the window "integrity check" by using the alignments in the graphic and the "#frames integrated" and "starting at #" values. 
In your case, the right values are 8 and 4. 
In the next window "set integration + binning", you have to report these values in the Binning/integration fields. 
Then and only then, the light curve will show 1 integration = 1 point, and the analysis can begin.
Attached is my time extraction giving the following result:
D - 21:48:30.60 +/- 0.32 sec
R - 21:48:31.72 +/- 0.16 sec

Duration: 1.12 +/- 0.36 sec

 

 

1) In AOTA, you have to manually set the zones of transition (in yellow)
in tab 5, “adjust regions”, with enough points on each side of the
actual transitions, allowing AOTA to calculate the uncertainties based
on the noise of the curve. The rule, most of the time, is that the
uncertainties (red lines) should not touch a yellow border.

2) When setting the zones of transition, even when the event is short,
try to shift the 2nd and 3rd points by at least one point, this to
prevent AOTA making the bottom of the fit on the background instead of
on the occultation level.

3) The blue zone is controlled by the “# points outside of transition”
in “Adjust regions” and is used the measure the mean full and
occultation levels.

4) When you click on “get event locations”, if the fit does not match
the occultation (ingress, egress and occultation level) and the yellow
zones are different than the ones you choose (assuming that you have set
them correctly), just move back and forth the “# points outside of
transition” value and everything should be back to normal.

5) Always in tab 5, the histogram “chi2 – for different transitions”
gives you the best transition for D and R (looking at the height of each
rectangle). Most of the time, use only transitions of type 1 or 2, not
more, unless you have a good reason to think that the transition is
really gradual.

6) Each click on the selected green rectangle in the chi2 histogram runs
a Monte Carlo analysis, which allows you to test different solutions
independently for D and R. When possible, prefer the most symmetrical
solution around the apparent transition.

 

NIEPEWNOŚĆ CZASU TRWANIA ZJAWISKA

przykład:
D  – 18:24:19.38 +/- 0.08
R  – 18:24:22.58 +/- 0.08
Duration: 3.20 +/- ?

Apart from cases where D & R are affected by an uncertainty which does 
not affect the duration (for example a bad time sync), the usual 
uncertainty on the duration is the quadratic sum of the D and R 
uncertainties, i.e. the square root of the sum of the squares of the 
uncertainties. So in this case, 3.20 +/- 0.11 sec.