ASTEROIDAL OCCULTATION - REPORT FORM

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

1 DATE: 2021/08/22
  STAR: UCAC4 567-035481
  ASTEROID: (49) Pales

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: 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  - 02:42:27    -      -      :
    D  - 02:44:49.04 -      - 0.10 :
    R  - 02:44:53.17 -      - 0.08 :
    E  - 02:47:10    -      -      :
  
                          Duration : 4.13 +/- 0.13 s
                         Mid-event : 02:44:51.10 +/- 0.06 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, ping: 11 ms, accuracy: 1 ms
  Sensor: ZWO ASI174MM-C
  Recording: ZWO ASICAP V2.3
  Exposure: 100 ms

7 OBSERVING CONDITIONS:
  Atmospheric transparency: good  Wind: no   Temperature: 12 deg C
  Star image stability: poor      Minor planet visible: barely

8 ADDITIONAL COMMENTS:
  Analyzed using Tangra v3.7.3 and AOTA v4.12.10
  S/N of occulted star: 3.9 - 4.1 (AOTA)
  Measured magnitude drop: 1.5 m (based on CSV generated by Tangra)
  
  I don't see the asteroid during occultation but Tangra light curve
  reports small positive values.

 IBEROC feed (2021/07/25):
  Event time: 02:44:52 UT
  Error in time: 0 s
  Max duration: 4.0 s
  Star magnitude: 11.9 m
  Asteroid magnitude: 13.3 m
  Combined magnitude: 11.6 m
  Magnitude drop: 1.7 m
  Star altitude: 27 deg E
  Sun altitude: -9 deg NE
  Sun distanse: 45 deg
  Position: In the shadow, 31 km from the central line
  Probability: 100.0 %