ASTEROIDAL OCCULTATION - REPORT FORM

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

1 DATE: 17 August 2019                   STAR: TYC 2418-01109-1  (9.5 mag)
  ASTEROID: Fringilla                No: 709

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  - 00:09:33    - N/A  - 1    :
    D  - 00:10:45.07  -     - 0.4  :   
    R  - 00:10:47.07  -     - 0.4  :   
    E  - 00:11:18    - N/A  - 1    :
  
                          Duration : 2.0 s
                         Mid-event : 00:10:46.1
               Predicted mid-event : 17 Aug; 00:10:46 UT  +/- 1 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 low value and stable - offset +0.009s, delay 0.03s at 00:10-00:11);  additional time correction based on DCF77 receiver with blinking 1PPS diode applied -an offset of -0.03s to the laptop synchronised time has been considered in final results.
  Sensor: ZWO ASI 120MM, shutter set for 80 ms, image resolution 640x480 px, gain 100, brightness 18, (a faint occulted star due to weather conditions).
  Recording: SharpCap v.3.1.5220 software, gamma 1.5, effective time resolution: 0.400 s.

7 OBSERVING CONDITIONS:
  Atmospheric transparency: good but humid with a haze    Wind: none              Temperature: 15 deg C
  Star image stability: good       Minor planet visible: no

8 ADDITIONAL COMMENTS:

  Very humid environment after intense rainfalls, a small haze and bright Moon on the opposite part of the sky, moisture accumulating on optical parts and other equipment. 
  The light curve analyze using Tangra software with gamma of 2.5 (faint star, however, of a good stability),
  the dis- and reappearance clearly noticed on screen during the observation and the recording analyze.
  Predicted max 3.0 sec duration with 5.3 mag drop.
  Event probability at site : 68%
  Distance from center line : 60 km
  Local * conditions (Alt,Az): 21°, @57°