ASTEROIDAL OCCULTATION - REPORT FORM

    +------------------------------+  +------------------------------+
    |            EAON              |  |            IOTA/ES           |
    |                              |  |   INTERNATIONAL OCCULTATION  |
    |     EUROPEAN  ASTEROIDAL     |  |      TIMING  ASSOCIATION     |
    |     OCCULTATION NETWORK      |  |       EUROPEAN SECTION       |
    +------------------------------+  +------------------------------+

1 DATE (YYYY/MM/DD):	2022/05/12
	STAR:		HIP 93319
	ASTEROID:	2010 BV71
	N°: 		343317

2 OBSERVERS: 
	Name: Leszek Benedyktowicz        PTMA SOPiZ
        E-mail: lechben@go2.pl
        Address: Krakow, Poland

3 OBSERVING STATION: 
	Nearest city:            Balice
	Station:                 mobile station
	Longitude (DD MM SS.s):    E 019 47 05.39 (WGS84)
	Latitude    (DD MM SS.s):  N  50 04 07.89 (WGS84)
	Altitude (m):            238 m (WGS84)
        Single|Multiple station: Single


                         +----------------------------+
4 TIMING OF EVENTS:      |                            |
                         |  EVENT REPORTED: POSITIVE  |
                         |                            |
                         +----------------------------+

	Event code
	S: observation Start   I: Interruption start
	D: Disappearance       J: Interruption end
	R: Reappearance        B: Blink   F: Flash
	E: observation End     O: Other (specify)
  
                                                  Comments
  Event   Time (UT)    P.E.   Acc.   
  Code   HH:MM:SS.ss   S.ss   S.ss

    S - 01:21:37.50  
    D - 01:22:08.41  +/- 0.01 sec
    R - 01:22:08.86  +/- 0.01 sec
    E - 01:22:29.00        
  
        Duration : 0.45 +/- 0.01 sec
        Mid-event : 01:22:08.64 +/- 0.01 sec
        
5 TELESCOPE:
        Type: Schmidt-Cassegrain
        Aperture: 203 mm
        Focal length: 1000 mm (reducer 0.5x)
        Mount:  Azimuth
        Motor drive: Yes 
        Filter: 

6 TIMING & RECORDING:
        Time source: SNTP ,  NetTime 3.20 Alpha3
        Sensor: ZWO ASI 120MM
        Recording:  30 ms integration , (Exposure= 0,03 s)
        Recording device: laptop ASUS, SharpCap 3.2 (Windows10)
        Time  insertion: time laptop corrected flashing LED GPS-inserter 

7 OBSERVING CONDITIONS:
        Atmospheric transparency: good
        Wind: NO
        Temperature: 10 °C 
        Star image stability: good
        Minor planet visible:  NO

8 ADDITIONAL COMMENTS:  gradual effect

-----------------------------------------
Eric Frappa's comments:

The reason of the gradual transitions for this event is Fresnel
diffraction. The main point in this case is that the occultation times
have to be extracted at 75% drop of the target star (and not 50% as
usual). To do this, I used the corresponding function in PyOTE allowing
to take diffraction into account.

After correcting the occultation times by -1/2 exposure time (Tangra
exports mid-exposure times in the .csv file where PyOTE expects to
receive start-exposure times) I get the following result:

D - 01:22:08.41 +/- 0.01 sec
R - 01:22:08.86 +/- 0.01 sec

Duration: 0.45 +/- 0.01 sec

        (PyOTE times below are uncorrected)
=============== Summary report for Excel file =====================

This light curve has not been block integrated.

The following lightcurve parameters were utilized:

==== use diff: is checked
==== exp: 0.030006
==== dist(AU): 2.1480
==== speed(km/sec): 4.1085
==== Star diam(mas): 0.1000
==== D limb angle: 90.0
==== R limb angle: 90.0

This 'drop' has a 0.0000 probability of being an artifact of noise.

magDrop: 1.827 +/- 0.269 (0.95 ci)

snr: 5.74

D time: [01:22:08.4287]
D: 0.6800 containment intervals: {+/- 0.0045} seconds
D: 0.9500 containment intervals: {+/- 0.0105} seconds
D: 0.9973 containment intervals: {+/- 0.0208} seconds

R time: [01:22:08.8770]
R: 0.6800 containment intervals: {+/- 0.0045} seconds
R: 0.9500 containment intervals: {+/- 0.0105} seconds
R: 0.9973 containment intervals: {+/- 0.0208} seconds

Duration (R - D): 0.4483 seconds
Duration: 0.6800 containment intervals: {+/- 0.0066} seconds
Duration: 0.9500 containment intervals: {+/- 0.0145} seconds
Duration: 0.9973 containment intervals: {+/- 0.0264} seconds

=========== end Summary report for Excel file =====================