ASTEROIDAL OCCULTATION - REPORT FORM

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

1 DATE: 2022/03/11     
  STAR: UCAC4 445-033109     
  ASTEROID: (439) Ohio 

2 OBSERVER: Name: Mateusz Kalisz                EAON Abbr:
            E-mail: astrolife88@gmail.com
            Address: Czermno, Poland

3 OBSERVING STATION: Nearest city: Przedborz
  Station: Czermno
  Longitude (DD MM SS.s): 20 01 28.8 E  +/- 0.2"
  Latitude  (DD MM SS.s): 51 06 36.9 N  +/- 0.2"
  Altitude (m): 232
  Datum (WGS84 preferred): WGS'84

  Single, OR Double or Multiple station (Specify observer's name):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)
  
  Abbreviations
  P.E.: Personal Equation = reaction time (for visual obs)
  Unc.: Uncertainty (global uncertainty on the given time)
  
                                                  Comments
  Event   Time (UT)    P.E.   Unc.   
  Code   HH:MM:SS.ss   S.ss   S.ss
  
    S  - 19:29:49    -      -      :
    D  - 19:36:58.57 -      -      : 0.1 s
    R  - 19:37:04.13 -      -      : 0.1 s
    E  - 19:41:43    -      -      :
  
                             Duration : 5.57 s
  Calculated drop (from LC by Tangra) : 2.62 mag 

  Was your reaction time applied to the above timings? not relevant

5 TELESCOPE: Type: NEW       Aperture: 405 mm     Focal lenght: 1800 mm
             Mount: alt-az   Motor drive: yes

6 TIMING & RECORDING:
  Time source: NTP (time.windows.com)
  Sensor: ZWO ASI 294 MC Pro Color
  Recording: 0.033 s
  Time  insertion (specify):
  Event insertion (specify):

7 OBSERVING CONDITIONS:
  Atmospheric transparency: good    
  Star image stability: good        
  Minor planet visible: yes

8 ADDITIONAL COMMENTS:
  The first asteroidal occultation recorded by observer ever.
  Uncertainties may be greater than 0.1 s due to synchronization with an unreliable NTP server.
  Step LC, no entry in the WDS double stars catalog - double star detection ?
------------------------------------------------------------------------------------------------
Eric Frappa's comments:

Unfortunately, it seems that this observation is affected by many 
issues. Adding it in the profile of 5 chords we already have shows the 
following points:

1) the occultation times given in the report have an absolute timing 
error in the order of 1 sec.

2) the chord duration is apparently too short.

3) about the step mentioned, it seems actually that the entire curve 
shows steps looking like multiple outputs of a single exposure. Since we 
do not have here an analog camera with integrating function, I'm not 
sure to understand what happens. Maybe that we have a lot of inserted 
frames because of a too large frame rate. A quick look at the video on 
Youtube shows indeed that the visible image frequency does not match by 
far with the 30 fps announced.

In the current state this observation is not usable. Maybe the video 
requires more work, but I'm afraid that at least the poor sync of the 
system clock is something unsolvable.