ASTEROIDAL OCCULTATION - REPORT FORM

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

1 DATE: 14 August 2019                   STAR: UCAC4 368-180084  (11.3 mag)
  ASTEROID: Erigone                No: 163

2 OBSERVER: Name: Marek Zawilski            Abbr:
            Address: 91-473 Lodz, Poland

3 OBSERVING STATION: Nearest cities: Lodz and Poddebice
  Station: Tobolice
  Latitude:  51d 54' 48.3" N
  Longitude: 19d 03' 22.4" E
  Altitude:  140m MSL
  Datum (WGS84 preferred): WGS84

  Single, OR Double or Multiple station (Specify observer's name):
  SINGLE

                         +----------------------------------+
4 TIMING OF EVENTS:      |                                  |
                         |  OCCULTATION RECORDED: POSITIVE  |
                         |                                  |
                         +----------------------------------+
  Type of event
  Start observation   Interrupt-start   Disappearance   Blink   Flash
  End observation     Jnterrupt-end     Reappearance    Other (specify)

                                                  Comments
  Event   Time (UT)    P.E.   Acc.   
  Code   HH:MM:SS.ss   S.ss   S.ss
  
    S  - 22:33:57    - N/A  - 1    :
    D  - 22:35:31.01  -     - 0.2  :   D on two frames, gradual
    R  - 22:35:35.19  -     - 0.2  :   R on two frames, gradual
    E  - 22:36:31    - N/A  - 1    :
  
                          Duration : 4.2 s
                         Mid-event : 22:35:33.1
               Predicted mid-event : 3 Aug; 22:35:30 UT  +/- 2 sec

  Was your reaction time applied to the above timings? N/A

5 TELESCOPE: Type: Cassegrain       Aperture: 203mm    Magnification: ---
             Mount: Equatorial     Motor drive: YES   Foc.length: 2032mm reduced to 1016mm

6 TIMING & RECORDING:
  Time source: NTP via Dimension4 using the time server "vega.cbk.poznan.pl", laptop-time synchronized better than 0.01s, response of about 10 Polish ntp time servers checked evry one minute with the use of the professional software by T.Kluwak, regarding the time offset and resopose delay (both of very low value and stable - offset +0.005s, delay 0.03s at 22:35-22:36);  additional time correction based on DCF77 receiver with blinking 1PPS diode applied -an offset of -0.05s to the laptop synhronised time has been considered in final results.
  Sensor: ZWO ASI 120MM, shutter set for 199 ms, image resolution 1024x968 px, gain 100, brightness 18 (a faint occulted star).
  Recording: SharpCap v.3.1.5220 software

7 OBSERVING CONDITIONS:
  Atmospheric transparency: very good   Wind: none              Temperature: 10 deg C
  Star image stability: good       Minor planet visible: yes

8 ADDITIONAL COMMENTS:
 
  The light curve analyze using Tangra software with gamma of 1.5 (faint star and some noise of its image; a guiding star, however, of a good stability),
  the dis- and reappearance clearly noticed on screen during the observation and the recording analyze.
  Predicted max 6.5 sec duration with 2.5 mag drop.
  Event probability at site : 82%
  Distance from center line : 40 km
  Local * conditions (Alt,Az): 19°, @201°