ASTEROIDAL OCCULTATION - REPORT FORM

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

1 DATE: 8 October 2021             STAR: UCAC4 505-019466  (13.1 mag)
  ASTEROID: 1998 HR115                      No: 11722

2 OBSERVER: Name: Marek Zawilski            Abbr:
            E-mail: marek.zawilski@p.lodz.pl
            Address: ul.Julianowska 5/7 m.322, 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  - 01:01:00    - N/A  - 1    :
    D  -   -                       :  
    R  -   -                       :   
    E  - 01:03:01    - N/A  - 1    :
  
                          Duration : no occultation 
                          Predicted mid-event : 08 Oct.; 01:01:59 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: Laptop time controlled by the GPS Shelyak TimeBox device (time error 0.000 s).
  Sensor: ZWO ASI 120MM, shutter set for 200 ms, image resolution 1024x768 px, gain 80.
  Recording: SHARPCAP v.3.2.6383.0 software

7 OBSERVING CONDITIONS:
  Atmospheric transparency: very good, cloudless          Wind: none            Temperature: +5 deg C
  Star image stability:     good                          Minor planet visible: no

8 ADDITIONAL COMMENTS:
 
The light curve analyze using Tangra software and a careful inspection of the screen replay showed no longer remarkable rapid drop of the star brightness caused by the asteroid. So, there was no occultation longer than 0.2s and the observation has been classified as negative.

  Predicted max 0.9 sec duration with 5.7 mag drop.
  Event probability at site : 14.1 %.
  Distance from center line : 2.1 km in 352° direction, inside the predicted path.
  Local * conditions (Alt,Az): 38°, @126° in Orion.
  Moon (Alt,Az): below the horizon.