ASTEROIDAL OCCULTATION - REPORT FORM

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

 1 DATE: 22 December 2021                          STAR: UCAC4 554-131775

  ASTEROID: Tarka                                No: 1360

 2 OBSERVER: 
  Name      : Maciej Borkowski                               
  Address   : 16-001 Ksiezyno, Poland

 3 OBSERVING STATION: 
  Nearest city : Bialystok
  Station      : Ksiezyno                   Acc.
  Latitude     : 53 4 33.7 N            -   0.1"
  Longitude    : 23 6 07.8 E            -   0.1"
  Altitude     : 145                    -   1m

  Datum (WGS84 preferred): WGS84

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

 4 TIMING OF EVENTS:  
  +----------------------------------------------+
  |       OCCULTATION RECORDED: INCOLCLUSIVE     |
  +----------------------------------------------+
  Type of event:
 "S"tart observation   "I"nterrupt-start   "D"isappearance   "B"link   "F"lash
 "E"nd observation     "J"nterrupt-end     "R"eappearance    "O"ther (specify)

  Event   Time (UT)    P.E.   Acc.   
  Code   HH MM SS.ss   S.ss   S.ss
  

  S  - 18:04:47.5
  E  - 18:08:23.4


  Predicted max. duration (secs) : 2.3
  Predicted max. drop (mag)      : 3.0
  Predicted mid-event (UT)       : 18:06:26
  Predicted error in time (secs) : 2

  Was your reaction time applied to the above timings? - not relevant
  
 5 TELESCOPE: 
  Type        : Newton f/5                            Aperture   : 300 mm
  Focal length: 1500 mm                               FOV        : 14.7'x 10.0'
  Mount       : azimuthal                             Motor drive: yes

 6 TIMING & RECORDING:
  Time source      : AME Video time inserter TIM - 10 (GPS time)  
  Sensor           : WATEC 910 HX camera  
  Mode of recording: 8 bit AVI, AGC: HIGH
  Shutter          : 0.16 s
  Recording        : Laptop DELL Latitude 7480 (Windows 10 Intel Core i7 2.80GHz RAM 16 GB)
  Recording        : VirtualDub2 build 44015

 7 OBSERVING CONDITIONS: 
  Atmospheric transparency          : good 
  Wind  (m/s)                       : 1
  Temperature (deg C / humid.)      : -15 / 86
  Star image stability              : not good enough to determine if the observation was positive or negative (too short exposure time)
  Minor planet visible              : no
  Local conditions (degree)         : star altitude: 51 SW, sun altitude: -33
  Local moon conditions (degree)    : 7 NE

 8 ADDITIONAL COMMENTS:
  Observed star                           : UCAC4 554-131775
  Star magnitude (mag)                    : 14.1
  Minor planet magnitude (mag)            : 17.0
  Feed                                    : UKOCL, last updated Nov 23, 2021
  Rank                                    : 87
  Distance (km)                           : In the shadow, 17 km from the central line
  Travel distance (km)                    : 17 km N
  Shadow width (km)                       : 39
  Predicted probability OccultWatcher (%) : 48.4
  Predicted combined magnitude (mag)      : 14.0
  Faintest star on AVI (mag)              : 14.4
  Evaluation with Tangra 3.7