ASTEROIDAL OCCULTATION - REPORT FORM

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

1 DATE: 2021/09/28
  STAR: UCAC4 425-131772
  ASTEROID: (1415) Malautra

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  - 22:28:42    -      -      :
    D  - 22:29:54.10 -      - 0.20 :
    R  - 22:29:55.30 -      - 0.20 :
    E  - 22:31:33    -      -      :

                          Duration : 1.20 +/- 0.28 s
                         Mid-event : 22:29:54.70 +/- 0.14 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: 400 ms

7 OBSERVING CONDITIONS:
  Atmospheric transparency: fair  Wind: no   Temperature: 9 deg C
  Star image stability: medium      Minor planet visible: yes

8 ADDITIONAL COMMENTS:
  Analyzed using Tangra v3.7.3 and AOTA v4.12.13
  S/N of occulted star: 5.5 - 8 (Tangra), 3.7 - 3.9 (AOTA)
  Camera temperature: -15 deg C
  
  The asteroid was 1.26x brighter than the occulted star - measured
  15 minutes before the predicted occultation using Tangra - so actual
  expected maximum drop was only 0.63 mag.

  Observed drop: 0.5 mag (measured graphically in AOTA).

  The applied approximate recording delay (40 ms) was based on the report for similar
  hardware configuration and the same USB setting and similar exposure,
  published by Pierre Le Cam on http://www.nocturno.fr/ost/ost.html .

 IBEROC feed (2021/08/26):
  Event time: 22:29:56 UT
  Error in time: 2 s
  Max duration: 1.1 s
  Star magnitude: 15.0 m
  Asteroid magnitude: 15.4 m
  Combined magnitude: 14.4 m
  Magnitude drop: 1.0 m
  Position: In the shadow, <1 km from the central line
  Probability: 69.2 %