ASTEROIDAL OCCULTATION - REPORT FORM

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

1 DATE: 2021/02/14  STAR: UCAC4 562-010957  ASTEROID: 2000 AJ102 No: 71342

2 OBSERVER: Name: Daniel BLAZEWICZ
            Address: 32-015 Klaj, POLAND

3 OBSERVING STATION: Klaj  Nearest city: Niepolomice (Poland)
  Longitude: E 20 19 04.2 (WGS84)
  Latitude:  N 49 59 33.2 (WGS84)
  Altitude:  211 m (MSL)
  Single station

                         +----------------------------+
4 TIMING OF EVENTS:      |                            |
                         |  EVENT REPORTED: UNCERTAIN |
                         |                            |
                         +----------------------------+
  
  Event code
  S: observation Start   I: Interruption start
  D: Disappearance       J: Interruption end
  R: Reappearance        B: Blink   F: Flash
  E: observation End     O: Other (specify)
  
  Abbreviations
  P.E.: Personal Equation = reaction time (for visual obs)
  Acc.: Accuracy (overall accuracy of the given time)
  
                                                  Comments
  Event   Time (UT)    P.E.   Acc.   
  Code   HH:MM:SS.ss   S.ss   S.ss
  
    S  - 17:41:03    -      -      :

    D  - 17:41:18.53 -      - 0.25 :
    R  - 17:41:19.90 -      - 0.38 :

    E  - 17:43:09    -      -      :

                          Duration : 1.37 +/- 0.43 s
                         Mid-event : 17:41:19.22 +/- 0.22 s

5 TELESCOPE: Type: NEWTON    Aperture: 350 mm
             Magnification: prime focus f/4.8
             Mount: EQUATORIAL with polar wedge    Motor drive: YES

6 TIMING & RECORDING:
  Time source: NTP Stratum 1, Linux Ubuntu, synchronization every 32 s
               (NTP offset in the above period: -2.1 ms / +0.7 ms)
  Sensor: ZWO ASI174MM-C
  Recording: ZWO ASICAP V2.3

7 OBSERVING CONDITIONS:
  Atmospheric transparency: good  Wind: moderate-strong  Temperature: -6 deg C
  Star image stability: poor      Minor planet visible: no

8 ADDITIONAL COMMENTS:
  Exposition time: 0.5 s
  Camera temperature: -20 deg C

  The candidate does not pass the false positive test in pyOTE.
  Observed drop: 1.3 m

 Feed: ITALOccult (2021/02/11)
  Event time: 17:41:25 UT
  Error in time: 8 s
  Max duration: 0.5 s
  Star magnitude: 13.8 m
  Asteroid magnitude: 19.5 m
  Combined magnitude: 13.8 m
  Magnitude drop: 5.7 m
  Position: In the shadow, 1 km from the center line
  Probability: 2.5%

 Big thank you to both Wojciech Burzynski and Eric Frappa for their analysis
 in Tangra, AOTA, pyOTE, and valueable comments.

 The reported observation period is short due to wind. Tangra had problems with
 correct tracking of stars. That affected quality of generated light curve: there
 are false-positive light drops (outside the reported period).

 Manual inspection of images shown only single disappearance of the star during
 the reported period.