ASTEROIDAL OCCULTATION - REPORT FORM

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

1 DATE: 19 March 2022             STAR: HIP 27793  (8.6 mag)
  ASTEROID: Jimsimons                   No: 6618

2 OBSERVER: Name: Marek Zawilski            Abbr:
            E-mail: marek.zawilski@p.lodz.pl
            Address: ul.Julianowska 5/7 m.322, 91-473 Lodz, Poland
            Assitance: Mieczyslaw Borkowski

3 OBSERVING STATION: Nearest cities: Lodz
  Station: Bedkow-Kolonia
  Latitude:  51d 36' 03.9" N
  Longitude: 19d 44' 49.2" E
  Altitude:  182 m MSL
  Datum (WGS84 preferred): WGS84

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

                         +----------------------------------+
4 TIMING OF EVENTS:      |                                  |
                         |  OCCULTATION RECORDED: POSITIVE  |
                         |                                  |
                         +----------------------------------+
  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  - 01:17:30      - N/A  1.0   
    D  - 01:18:13.52          0.02               AOTA analysis
    R  - 01:18:13.72          0.03               AOTA analysis
    E  - 01:19:01      - N/A  1.0    
 
                          Duration : 0.20 sec
                         Mid-event : 01:18:13.62
               Predicted mid-event : 19 Mar;01:18:14 UT  +/- 1 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: Laptop time controlled by the GPS Shelyak TimeBox device (systematic time delay +0.807 s with 8 satellites, considered in final results).
  Sensor: ZWO ASI 120MM, shutter set for 50 ms, video time resolution 50 ms, image resolution 640x480 px, gain 50, brightness +12.
  Recording: SHARPCAP v.4.0.8667.0 software.

7 OBSERVING CONDITIONS:
  Atmospheric transparency: good          Wind: none            Temperature: -5 deg C
  Star image stability: moderate          Minor planet visible: yes

8 ADDITIONAL COMMENTS:
 
  The light curve analyze using Tangra software and a careful inspection of the screen replay showed a clearly remarkable drop of the star brightness caused by the asteroid. The star image was stable  both for the occulted and a guiding star. 
  The D and R times according to the AOTA analysis. The star rapidly disappeared and was invisible on 4 sequential frames.
  

  Predicted max.0.5 sec. duration with 8.5 mag. drop.
  Event probability at site : 51%
  Distance from center line : 0.3 km, inside the predicted path.
  Local * conditions (Alt,Az): 12°, @320° in Auriga.
  Moon (Alt, Az): 34°, @212°, did not disturb the observation.