ASTEROIDAL OCCULTATION - REPORT FORM

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

1 DATE: 2022/10/31
  STAR: UCAC4 529-048408
  ASTEROID: (1233) Kobresia

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

3 OBSERVING STATION: Klaj  Nearest city: Niepolomice (Poland)
  Longitude: E 20 19 04.4 (WGS84)
  Latitude:  N 49 59 33.1 (WGS84)
  Altitude:  210 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  - 00:10:58    -      -      :
    E  - 00:17:06    -      -      :

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: 250 ms

7 OBSERVING CONDITIONS:
  Atmospheric transparency: good  Wind: weak   Temperature: 11 deg C
  Star image stability: fair      Minor planet visible: no

8 ADDITIONAL COMMENTS:
  Analyzed using Tangra v3.7.4 and AOTA v4.2022.10.28
  S/N of occulted star: 4.7 - 6
  Camera temperature: -20 deg C

  Observed no drop bigger than 0.9 mag (AOTA)
  Gaia RUWE: 3.95

 IBEROC feed (2022/09/23, Horizons JPL#51):
  Event time: 00:13:59 UT
  Error in time: 1 s
  Max duration: 1.6 s
  Star magnitude: 13.2 mag
  Asteroid magnitude: 16.9 mag
  Combined magnitude: 13.2 mag
  Magnitude drop: 3.7 mag
  Position: In the shadow, 17 km from the central line
  Probability: 54.3 %

Drop not bigger than 0.6 mag around the predicted occultation time.
No occultation > 0.25s for 1.2 mag drop.