ASTEROIDAL OCCULTATION - REPORT FORM

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

1 DATE: 2021/10/21
  STAR: G013724.6+140906
  ASTEROID: (1647) Menelaus

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 33.4 (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  - 20:11:01    -      -      :
    D  - 20:12:31.36 -      - 0.03 :
    R  - 20:12:31.94 -      - 0.03 :
    E  - 20:14:25    -      -      :

                          Duration : 0.58 +/- 0.04 s
                         Mid-event : 20:12:31.65 +/- 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: 50 ms
  Camera temperature: -10 deg C

7 OBSERVING CONDITIONS:
  Atmospheric transparency: good  Wind: strong   Temperature: 12 deg C
  Star image stability: fair but shaky      Minor planet visible: no

8 ADDITIONAL COMMENTS:
  Analyzed using PyMovie v3.1.4 and AOTA v4.12.15
  S/N of occulted star: 5.3 - 5.4 (AOTA)
  
  Observed magnitude drop: 0.9 m (calculated in spreadsheet)

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

 Personal feed (JPL#41 2021/10/07, Gaia EDR3):
  Event time: 20:12:30 UT
  Error in time: 4 s
  Max duration: 2.5 s
  Star magnitude: 12.0 m (and nearby star: 12.2 m)
  Asteroid magnitude: 17.5 m
  Combined magnitude: 12.0 m (including nearby star: 11.3 m)
  Magnitude drop: 5.5 m (including nearby star: 0.9 m)
  Position: In the shadow, 16 km from the central path
  Probability: 77.0 %