ASTEROIDAL OCCULTATION - REPORT FORM

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

 1 DATE: 29 December 2020                              STAR: UCAC4 639-024294

  ASTEROID: 2003 YK140                                      No: 226581

 2 OBSERVERS: 
  Name      : Wojciech Brzyński                             Abrr: BZY
  Address   : 15-345 Bialystok, Poland

  Name      : Maciej Borkowski                              Abrr: 
  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: NEGATIVE         |
  +----------------------------------------------+
  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  - 20:00:46.0        
  E  - 20:04:45.5               

  Calculated mag drop:  

  Predicted max. duration (secs) : 0.6
  Predicted max. drop (mag)      : 7.9
  Predicted mid-event (UT)       : 20:03:07
  Predicted error in time (secs) : 9

  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:medium 
  Shutter          : 0.04 s
  Recording        : Laptop DELL Latitude 7480 (Windows 10 Intel Core i7 2.80GHz RAM 16 GB)
  Recording        : VirtualDub64 2.0.0.0

 7 OBSERVING CONDITIONS: 
  Atmospheric transparency          : good
  Wind  (m/s)                       : 10
  Temperature (deg C / humid.)      : 3 / 85
  Star image stability              : good 
  Minor planet visible              : no
  Local conditions (degree)         : star altitude: 70 SE, sun altitude: -49
  Local moon conditions (degree)    : moon altitude: 52 SE, moon distance: 19

 8 ADDITIONAL COMMENTS:
  Observed star                           : UCAC4 639-024294
  Star magnitude (mag)                    : 10.8
  Minor planet magnitude (mag)            : 18.7
  Feed                                    : IBEROC, last updated Dec 1, 2020
  Rank                                    : 5
  Distance (km)                           : in the 1-sigma zone, 13 km outside the shadow path
  Travel distance (km)                    : 17 km NW
  Shadow width (km)                       : 7
  Predicted probability OccultWatcher (%) : 2.8
  Predicted combined magnitude (mag)      : 10.8 
  Faintest star on AVI (mag)              : 12.1 
  Evaluation with Tangra 3.7