ASTEROIDAL OCCULTATION - REPORT FORM

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

1 DATE: 27 December 2021             STAR: TYC 1395-01280-1  (11.1 mag)
  ASTEROID: Adorea                   No: 268 

2 OBSERVER: Name: Marek Zawilski            Abbr:
            91-473 Lodz, Poland
            Assitance: Klemens Liban

3 OBSERVING STATION: Nearest cities: Lodz 
  Station: Aleksandrow L.
  Latitude:  51d 49' 43.0" N
  Longitude: 19d 18' 42.8" E
  Altitude:  177m 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  - 04:13:15      - N/A  1.0   
    D  - 04:13:47.88          0.04               AOTA analysis
    R  - 04:13:58.93          0.04               AOTA analysis
    E  - 04:14:53      - N/A  1.0    
 
                          Duration : 11.05 sec
                         Mid-event : 04:13:53.41
               Predicted mid-event : 27 Dec; 04:13:54 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 Shelyak TimeBox device (time error +0.164 s with 4 satellites, condisered in final results).
  Sensor: ZWO ASI 120MM, shutter set for 50 ms, video time resolution 71 ms, image resolution 1024x768 px, gain 67.
  Recording: SHARPCAP v.3.2.6480.0 software.

7 OBSERVING CONDITIONS:
  Atmospheric transparency: very good   Wind: none            Temperature: -15 deg C
  Star image stability: average            Minor planet visible: no

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

  Predicted max. 17.7 sec. duration with 2.0 mag. drop.
  Event probability at site : 100%
  Distance from center line : 80 km in 219° direction, inside the predicted path.
  Local * conditions (Alt,Az): 39°, @247° in Cancer.
  Moon (Alt, Az): 39°, @167°, elongation 61°, did not disturb the observation.