ASTEROIDAL OCCULTATION - REPORT FORM

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

1 DATE: 2021/12/28
  STAR: UCAC4 592-015555
  ASTEROID: (7666) Keyaki

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: NEGATIVE  |
                         |                            |
                         +----------------------------+
  
  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  - 18:05:30    -      -      :
    E  - 18:10:13    -      -      :

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
  Sensor: ZWO ASI174MM-C
  Recording: ZWO ASICAP V2.3
  Exposure: 18:05:30 - 18:05:53 : 100 ms,
            18:05:53 - 18:05:59 : gradually decreasing from 100 ms to 80 ms,
            18:05:59 - 18:10:13 : 80 ms

7 OBSERVING CONDITIONS:
  Atmospheric transparency: fair  Wind: weak   Temperature: -3 deg C
  Star image stability: poor      Minor planet visible: no

8 ADDITIONAL COMMENTS:
  Analyzed using Tangra v3.7.3
  S/N of occulted star: 4 - 8 (Tangra)

 CentralEurope feed (2021/11/30):
  Event time: 18:07:18 UT
  Error in time: 6 s
  Max duration: 0.6 s
  Star magnitude: 11.9 m
  Asteroid magnitude: 17.2 m
  Combined magnitude: 11.9 m
  Magnitude drop: 5.3 m
  Position: In the shadow, < 1 km from the central line
  Probability: 6.9 %