ASTEROIDAL OCCULTATION - REPORT FORM

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

1 DATE: 12 August 2021             STAR: UCAC4 368-187571  (12.1 mag)
  ASTEROID: Columbianus                      No: 8434

2 OBSERVER: Name: Marek Zawilski            Abbr:
            E-mail: marek.zawilski@p.lodz.pl
            Address: ul.Julianowska 5/7 m.322, 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  - 23:46:11    - N/A  - 1    :
    D  -   -                       :  
    R  -   -                       :   
    E  - 23:47:30    - N/A  - 1    :
  
                          Duration : no occultation 
                         Mid-event : 
               Predicted mid-event : 12 Aug ; 23:46:47 UT  +/- 4 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 TimeBox device (time error 0.000 s).
  Sensor: ZWO ASI 120MM, shutter set for 100 ms, image resolution 1024x768 px, gain 71.
  Recording: SHARPCAP v.3.2.6383.0 software

7 OBSERVING CONDITIONS:
  Atmospheric transparency: good   Wind: none            Temperature: +19 deg C
  Star image stability: good      Minor planet visible: no

8 ADDITIONAL COMMENTS:
 
  Star faint. The light curve analyze using Tangra software and a careful inspection of the screen replay showed no longer remarkable rapid drop of the star brightness caused by the asteroid. The star image was stable enough both   for the occulted and a guiding star; so there was no occultation longer than 0.1s and the observation has been classified as negative.

  Predicted max 0.7 sec duration with 6.0 mag drop.
  Event probability at site : 8.6 %
  Distance from center line : 46 km in 133° direction, outside the predicted path, inside the 1-sigma limit
  Local * conditions (Alt,Az): 21°, @192° in Capricornus
  Moon below the horizon.