ASTEROIDAL OCCULTATION - REPORT FORM

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

 1 DATE: 19 Jun 2021                              STAR: TYC 6316-01695-1

   ASTEROID: (2271) Kiso                           

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

 3 OBSERVING STATION: 
  Nearest city : Augustow
  Station      : Molowiste - mobile station                 
  Latitude     : 53 55 35.3 N            -   0.1"
  Longitude    : 23 13 09.4 E            -   0.1"
  Altitude     : 126 MSL                 -   1 m

  Datum (WGS84 preferred): WGS84

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

 4 TIMING OF EVENTS:  
  +----------------------------------------------+
  |       OCCULTATION RECORDED: POSITIVE         |
  +----------------------------------------------+
  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 - 22:54:37.37
  D - 22:56:11.78         +/- 0.20
  R - 22:56:15.38         +/- 0.20
  E - 22:57:14.59  

  Duration: 3.60 s        +/- 0.28     


  Predicted max. duration (secs) : 4.4
  Predicted max. drop (mag)      : 3.7
  Predicted mid-event (UT)       : 22:56:11
  Predicted error in time        : 4 sec 

  Was your reaction time applied to the above timings? - not relevant
  
 5 TELESCOPE: 
  Type        : NEW  f/5                             Aperture   : 150 mm
  Focal length: 750 mm                               FOV        : 52' x 31'
  Mount       : azimuthal GOTO                       Motor drive: yes

 6 TIMING & RECORDING:
  Time source      : GPS 1PPS  
  Sensor           : QHY 174M GPS
  Mode of recording: 1920x1200, 12 bit FITS, Gain=480
  Mode of recording: Contrast=0, Brightness=0, Gamma=0.7
  Shutter          : 0.400 s
  Recording        : Laptop Dell Latitiude 3540 (Intel Core i5/RAM 8 GB/SSD 128 GB)
  Recording        : SharpCap 4.0.7859

 7 OBSERVING CONDITIONS: 
  Atmospheric transparency          : good 
  Wind  (m/s)                       : 5
  Temperature (deg C / humid.)      : 18 / 80
  Star image stability              : good 
  Minor planet visible              : no
  Local conditions (degree)         : star altitude: 15, sun altitude: -13 
  Local moon conditions (degree)    : moon altitude: 6, moon distatne: 93, moon phase: 67%

 8 ADDITIONAL COMMENTS:
  Observed star                           : TYC 6316-01695-1 
  Star magnitude (mag)                    : 11.3
  Minor planet magnitude (mag)            : 15.0
  Feed                                    : UKOCL, last updated May 30, 2021
  Rank                                    : 99
  Distance (km)                           : in the shadow, 6 km from the central line
  Shadow width (km)                       : 115
  Predicted probability OccultWatcher (%) : 99.7
  Predicted combined magnitude (mag)      : 11.3 
  Faintest star on movie (mag)            : 12.5
  Evaluation with Tangra 3.7.3 and AOTA 4.12.9.1

  9 REMARKS: 
  Slightly gradulal R. Measured mag drop was 1.2 instead of the 3.7 predicted (suspicion of a double star).