ASTEROIDAL OCCULTATION - REPORT FORM

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

 1 DATE: 31 March 2019                               STAR: UCAC4-475-051755  

  ASTEROID: Aletheia                                 No: 259

 2 OBSERVERS: 
  Name      : Tomasz Kluwak                          IAU Obs.code: K80
  Address   : 62-080 Losowko, Poland

 3 OBSERVING STATION: 
  Nearest city : Poznan
  Station      : Losowko            Acc.
  Latitude     : 52 26 32.3 N   -   0.1"
  Longitude    : 16 38 14.4 E   -   0.1"
  Altitude     : 131 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:
 "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  - 21:40:45.8   -    - 0.1
  E  - 21:50:58.4   -    - 0.1 

  Predicted max. duration (secs) : 16.7
  Predicted max. drop (mag)      : 1.29
  Predicted mid-event (UT)       : 21:46:07
  Predicted error in time (secs) : 4 

  Was your reaction time applied to the above timings? - not relevant, VTI recording
  
 5 TELESCOPE: 
  Type        : Rowe-Ackermann-Schmidt-Astrograph     Aperture   : 279 mm
  Focal length: 654 mm                                FOV        : 11.6'x 3.1'
  Mount       : equatorial                            Motor drive: yes

 6 TIMING & RECORDING:
  Time source      : NTP 
  Sensor           : ZWO ASI 290 MM CMOS camera
  Mode of recording: 50 fps, no integration
  Recording        : Win 10 64 bit laptop - Intel Core i7, RAM 16 GB
  Recording        : Firecapture with timestamp, AstroLights - own analizing software


 7 OBSERVING CONDITIONS: 
  Atmospheric transparency          : good 
  Star image stability              : good 
  Minor planet visible              : yes
  Local conditions (degree)         : star height: 34, sun height: -31, 
  Local moon conditions (degree)    : moon height: below horizon

 8 ADDITIONAL COMMENTS:
  Observed star                           : UCAC4-475-051755
  Star magnitude                          : 11.21
  Minor planet magnitude                  : 11.97
  Feed                                    : IOTA, last updated 01 Feb 2019
  Rank                                    : 100
  Distance (km)                           : outside the 3-sigma zone - 221 km SW from the central line
  Shadow width (km)                       : 217
  Predicted probability OccultWatcher (%) : 0
  Predicted combined magnitude (mag)      : 10.71