ASTEROIDAL OCCULTATION - REPORT FORM

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

1 DATE: 2021/12/27
  STAR: TYC 1865-02077-1
  ASTEROID: (13986) 1992 WA4

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

3 OBSERVING STATION: Klaj  Nearest city: Niepolomice (Poland)
  Longitude: E 20 19 03.7 (WGS84)
  Latitude:  N 49 59 33.4 (WGS84)
  Altitude:  210 m (MSL)
  Single station

                         +----------------------------+
4 TIMING OF EVENTS:      |                            |
                         |  EVENT REPORTED: POSITIVE  |
                         |                            |
                         +----------------------------+
  
  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  - 01:08:30    -      -      :
    D  - 01:09:28.62 -      - 0.03 :
    R  - 01:09:29.82 -      - 0.02 :
    E  - 01:11:33    -      -      :

                          Duration : 1.20 +/- 0.04 s
                         Mid-event : 01:09:29.22 +/- 0.02 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: "chrony", 4 x NTP Stratum 1, Linux Ubuntu, 1 sigma < 1 ms
  Sensor: ZWO ASI174MM-C
  Recording: ZWO ASICAP V2.3
  Exposure: 40 ms

7 OBSERVING CONDITIONS:
  Atmospheric transparency: fair  Wind: no   Temperature: -7 deg C
  Star image stability: good      Minor planet visible: no

8 ADDITIONAL COMMENTS:
  Analyzed using Tangra v3.7.3 and AOTA v4.12.16
  S/N of occulted star: 7.7 - 9.0 (AOTA)
  
  Faintest star on the recording: 11.9 m

  Applied approximate recording delay: 13 ms (based on the report for similar
  hardware configuration and the same both USB setting and ROI, and similar
  exposure, published by Pierre Le Cam on http://www.nocturno.fr/ost/ost.html)

 UKOCL feed (2021/11/14):
  Event time: 01:09:29 UT
  Error in time: 4 s
  Max duration: 1.0 s
  Star magnitude: 10.8 m
  Asteroid magnitude: 17.4 m
  Combined magnitude: 10.8 m
  Magnitude drop: 6.6 m
  Position: In the 1-sigma zone, 34 km outside the shadow path
  Probability: 8.4 %