ASTEROIDAL OCCULTATION - REPORT FORM

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

1 DATE: 15 July 2021             STAR: UCAC4 357-175456  (10.8 mag)
  ASTEROID: Aemilia                  No: 159 

2 OBSERVER: Name: Marek Zawilski            Abbr:
            Address: 91-473 Lodz, Poland

3 OBSERVING STATION: Nearest cities: Sieradz and Kalisz
  Station: Warta
  Latitude:  51d 41' 41.3" N
  Longitude: 18d 37' 04.2" E
  Altitude:  153m 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  - 21:42:31    - N/A  - 1    
    D  - 21:43:27.53          0.13               AOTA analysis
    R  - 21:43:36.17          0.13               AOTA analysis
    E  - 21:43:54    - N/A  - 1    
 
                          Duration : 8.64 sec
                         Mid-event : 21:43:31.9
               Predicted mid-event : 15 Jul; 20:43:33 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: GPS Shelyak TimeBox for adjusting the Lenovo laptop clock; A time correction established in relation do the 1pps TimeBox diode pulses: minus 0.03s (-30 ms).
  Sensor: ZWO ASI 120MM, shutter set for 258 ms, image resolution 1024x768 px, gain 77.
  Recording: SHARPCAP v.3.2.6480.0 software.

7 OBSERVING CONDITIONS:
  Atmospheric transparency: average   Wind: none            Temperature: +21 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 distinct drop of the star brightness caused by the asteroid. The star image was not very stable both for the occulted and guiding stars. Thin clouds and haze, magnitude loss about 2 mag. The D and R times according to the AOTA analysis. The observation was sure.

  Predicted max. 9.2 sec. duration with 2.5 mag. drop.
  Distance from center line : 49 km in 146° direction, inside the predicted path.
  Local * conditions (Alt,Az): 19°, @170° in Sagittarius
  Moon: at the horizon (moonset)
  Sun altitude: -16°