ASTEROIDAL OCCULTATION - REPORT FORM

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

1 DATE: 09 October 2021             STAR: TYC 2344-00070-1  (11.0 mag)
  ASTEROID: Loreley                  No: 165 

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: Turek
  Station: Psary
  Latitude:  51d 59' 55.4" N
  Longitude: 18d 38' 25.3" E
  Altitude:  124m 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  - 18:07:00    - N/A  - 1    
    D  - 18:08:04.02          0.06               AOTA analysis
    R  - 18:08:15.75          0.09               AOTA analysis
    E  - 18:09:04    - N/A  - 1    
 
                          Duration : 11.73 sec
                         Mid-event : 18:08:09.89
               Predicted mid-event : 08 Oct; 18:08:10 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: Laptop time controlled by the GPS Shelyak TimeBox device (time error 0.000 s).
  Sensor: ZWO ASI 120MM, shutter set for 100 ms, time resolution 116 ms, image resolution 1024x768 px, gain 82.
  Recording: SHARPCAP v.3.2.6480.0 software.

7 OBSERVING CONDITIONS:
  Atmospheric transparency: very good   Wind: none            Temperature: +5 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 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. 20.2 sec. duration with 2.2 mag. drop.
  Event probability at site : 97.4%
  Distance from center line : 101 km in 133° direction, inside the predicted path.
  Local * conditions (Alt,Az): 20°, @61° in Perseus.
  Moon (Alt, Az): below the horizon