ASTEROIDAL OCCULTATION - REPORT FORM

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

1 DATE: 18 April 2022             STAR: UCAC4 423-061143  (12.8 mag)
  ASTEROID: Sapientia                 No: 275 

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: Klemens Liban

3 OBSERVING STATION: Nearest cities: Lodz
  Station: Aleksandrow L.
  Latitude:  51d 49' 42.9" N
  Longitude: 19d 18' 42.7" E
  Altitude:  190 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  - 01:36:01      - N/A  1.0   
    D  - 01:36:58.99          0.13               AOTA analysis
    R  - 01:37:08.74          0.12               AOTA analysis
    E  - 01:38:01      - N/A  1.0    
 
                          Duration : 9.75 sec
                         Mid-event : 01:37:04.37
               Predicted mid-event : 18 Apr;01:37:05 UT  +/- 5 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 with 6 satellites).
  Sensor: ZWO ASI 120MM, shutter set for 250 ms, video time resolution 250 ms, image resolution 640x480 px, gain 58, brightness 6.
  Recording: SHARPCAP v.4.0.8667.0 software.

7 OBSERVING CONDITIONS:
  Atmospheric transparency: good        Wind: none            Temperature: -3 deg C
  Star image stability: good            Minor planet visible: yes 

8 ADDITIONAL COMMENTS:
 
  The light curve analyze using Tangra software showed a small drop of the star brightness caused by the asteroid. The star image was stable enough for the occulted star. Unortunately, no comparison star in the FOW.
  The D and R times according to the AOTA analysis.
  The observation was made inside the predicted path. The asteroid was brigther than the star.
  

  Predicted max. 11.4 sec. duration with 0.4 mag. drop.
  Event probability at site : 100%
  Distance from center line : 43.2 km in 219° direction, inside the predicted path.
  Local * conditions (Alt,Az): 26°, @218° in Virgo.
  Moon (Alt, Az): 19°, @207°, did not disturb observations much.