ASTEROIDAL OCCULTATION - REPORT FORM

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

1 DATE: 22 June 2020                   STAR: UCAC 561-089839 (11.5 mag)
  ASTEROID: Pallas               No: 2

2 OBSERVER: Name: Marek Zawilski            Abbr:
            Address: 91-473 Lodz, Poland

3 OBSERVING STATION: Nearest cities: Lodz and Poddebice
  Station: Tobolice
  Latitude:  51d 54' 48.3" N
  Longitude: 19d 03' 22.4" E
  Altitude:  140m MSL
  Datum (WGS84 preferred): WGS84

  Single, OR Double or Multiple station (Specify observer's name):
  SINGLE

                         +----------------------------------+
4 TIMING OF EVENTS:      |                                  |
                         |  OCCULTATION RECORDED: NEGATIVE  |
                         |                                  |
                         +----------------------------------+
  Type of event
  Start observation   Interrupt-start   Disappearance   Blink   Flash
  End observation     Jnterrupt-end     Reappearance    Other (specify)

                                                  Comments
  Event   Time (UT)    P.E.   Acc.   
  Code   HH:MM:SS.ss   S.ss   S.ss
  
    S  - 23:07:07    - N/A  - 1    :
    D  -      -                    :  
    R  -   -                       :   
    E  - 23:09:01    - N/A  - 1    :
  
                          Duration : no
                         Mid-event : 
               Predicted mid-event : 22 June; 23:08:00 UT  +/- 2 sec

  Was your reaction time applied to the above timings? N/A

5 TELESCOPE: Type: Cassegrain       Aperture: 203mm    Magnification: ---
             Mount: Equatorial     Motor drive: YES   Foc.length: 2032mm reduced to 1016mm

6 TIMING & RECORDING:
  Time source: Web time from a Polish time server via Dimension4 checked by DCF radio 1pps flash signal
  Sensor: camera ZWO ASI 120MM
  Recording: SharpCap 3.1.5220

7 OBSERVING CONDITIONS:
  Atmospheric transparency: good   Wind: none            Temperature: +17 deg C
  Star image stability: good       Minor planet visible: yes

8 ADDITIONAL COMMENTS:
 
  The light curve analyze using Tangra software and a careful inspection of the screen replay showed no remarkable drop of star brightness caused by the asteroid. 
  However, a slight decrease in brightness around 23:08:05 during about 1 second can be seen in the light curve. 
  This probably was caused by scintillations not by occultation (as such drops are visible at different times, too).

  Predicted max 41.8 sec duration with 0.2 mag drop in the centre of the path.
  Event probability at site : 0.0%
  Distance from center line : +375 km km in N direction (outside the 3-sigma limit)
  Local * conditions (Alt,Az): 58°, @154°