ASTEROIDAL OCCULTATION - REPORT FORM

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

1 DATE: 2021/10/24
  STAR: UCAC4 551-010883
  ASTEROID: (523752) 2014 VU37

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

3 OBSERVING STATION: Klaj  Nearest city: Niepolomice (Poland)
  Longitude: E 20 19 03.5 (WGS84)
  Latitude:  N 49 59 33.4 (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  - 22:34:36    -      -      :
    E  - 22:48:55    -      -      :

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, ping 9 ms, 1-sigma < 1 ms
  Sensor: ZWO ASI174MM-C
  Recording: ZWO ASICAP V2.3
  Exposure: 2 x 1000 ms = 2 s (i.e. stacked frames in post processing)
  Camera temperature: -30 deg C

7 OBSERVING CONDITIONS:
  Atmospheric transparency: fair  Wind: no   Temperature: 2 deg C
  Star image stability: fair      Minor planet visible: no

8 ADDITIONAL COMMENTS:
  Analyzed using PyMovie v3.2.4
  
  Assuming there is no nearby stars 1-second exposures would be enough to detect complete
  disapearance, but there was one star close to the occulted one. To be on the safe side decided
  to stack each 2 frames into 1. In result effective exposure was 2 seconds.
  
 Personal feed (JPL#11 2021/10/08, Gaia EDR3):
  Event time: 22:41:01 UT
  Error in time: 88 s
  Max duration: 17.1 s
  Star magnitude: 15.480 m (and nearby 16.152, separation < 4 arcsec)
  Asteroid magnitude: 21.4 m
  Combined magnitude: 15.5 m
  Magnitude drop: 5.9 m (1.14 m after including the nearby star)
  Position: 211 km outside the 1-sigma zone
  Probability: 4.3 %

 Lucky Star event - https://lesia.obspm.fr/lucky-star/occ.php?p=75874