ASTEROIDAL OCCULTATION - REPORT FORM

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

1 DATE: 12 September 2019                   STAR: UCAC4-409-079265  (11.5 mag)
  ASTEROID: Aline                No: 266

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: NEGATIVE  |
                         |                                  |
                         +----------------------------------+
  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  - 23:06:00     - N/A  - 1   :
    D  -              -      -     :   
    R  -              -      -     :   
    E  - 23:08:00     - N/A  - 1   :
  
                          Duration : no occultation longer than 0.20 s
                         Mid-event : 
               Predicted mid-event : 12 Sep; 23:07:00 UT  +/- 4 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 0.05s, 
  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 stable - offset -0.20s, delay 0.045s at 23:06-23:08 UT);  
  Sensor: ZWO ASI 120MM, shutter set for 100 ms, image resolution 320x240 px, gain 100
  Recording: ASICAP software ver.1.6.1, effective time resolution: 0.195 s.

7 OBSERVING CONDITIONS:
  Atmospheric transparency: good       Wind: none              Temperature: 14 deg C
  Star image stability: good       Minor planet visible: no

8 ADDITIONAL COMMENTS:

  The observations in a clear sky - in a pretty gap between two cloud layers approaching from the west. The star image was stable, no magnitude drop noticed both on the screen and the lightcurve normalized with a brighter guiding star. The lightcurve analyze using Tangra software ver.3.6 with gamma set on 1.5.
 
  Predicted max. 15.2 sec duration (for the center line) with 2.3 mag drop.
  Event probability at site : 13%
  Distance from center line : 234 km, a short distance outside the north-east one-sigma-limit.
  Local * conditions (Alt,Az): 17°, @229° in Scutum, bright Moon did not disturb observations.