ASTEROIDAL OCCULTATION - REPORT FORM

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

1 DATE: 19 July 2022             STAR: UCAC4 455-094835  (13.8 mag)
  ASTEROID: Iolanda                 No: 509 (12.9 mag.)

2 OBSERVER: Name: Marek Zawilski            Abbr:
            E-mail: marek.zawilski@p.lodz.pl
            Address: ul.Julianowska 5/7 m.322, 91-473 Lodz, Poland
            Assistance: none

3 OBSERVING STATION: Nearest cities:Lodz and Poddebice
  Station: Tobolice
  Latitude:  51d 54' 47.7" N
  Longitude: 19d 03' 22.6" E
  Altitude:  141 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  - 22:11:41      - N/A  1.0   
    D  - 22:12:38.7           0.30               AOTA analysis
    R  - 22:12:40.37          0.10               AOTA analysis
    E  - 22:13:41      - N/A  1.0    
 
                          Duration : 1.67 sec
                         Mid-event : 22:12:39.5
               Predicted mid-event : 19 Jul;22:12:40 UT  +/- 3 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 (time error -0.030 s with 7 satellites).
  Sensor: ZWO ASI 120MM, shutter set for 200 ms, video time resolution 200 ms, image resolution 1024x768 px, gain 80, brightness 10.
  Recording: SHARPCAP v.4.0.8949.0 software.

7 OBSERVING CONDITIONS:
  Atmospheric transparency: good           Wind: none            Temperature: 16 deg C
  Star image stability: average            Minor planet visible: yes 

8 ADDITIONAL COMMENTS:
 
  The light curve analyze using Tangra software and a careful inspection of the screen replay showed a possible small drop of the star brightness caused by the asteroid.  
  The D and R times according to the AOTA analysis.
  The observation was made inside the predicted path at its southern edge. The asteroid was brigther than the star.
  D and R times not very accurate, star scintillation.
  

  Predicted max. 4.4 sec. duration with 0.4 mag. drop.
  Event probability at site : 52.3%
  Distance from center line :40.6 km in 169° direction, inside the predicted path.
  Local * conditions (Alt,Az): 39°, @175° in Aquila.
  Moon (Alt, Az): at the horizon.