ASTEROIDAL OCCULTATION - REPORT FORM

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

 1 DATE: 05 September 2021                              STAR: TYC 1216-00557-1

   ASTEROID: (9590) 1991 DK1                           

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

 3 OBSERVING STATION: 
  Nearest city : Suprasl
  Station      : Lipowy Most                 Acc.
  Latitude     : 53 12 31.5 N            -   0.1"
  Longitude    : 23 31 37.9 E            -   0.1"
  Altitude     : 145 MSL                 -   1 m

  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 - 02:38:31.3
  E - 02:41:02.0 
  
  Predicted max. duration (secs) : 3.8
  Predicted max. drop (mag)      : 9.6
  Predicted mid-event (UT)       : 02:40:01
  Predicted error in time        : 25 sec 

  Was your reaction time applied to the above timings? - not relevant
  
 5 TELESCOPE: 
  Type        : NEW  f/4.7                            Aperture   : 254 mm
  Focal length: 1195 mm                               FOV        : 32.37' x 20.23'
  Mount       : equatorial GOTO                       Motor drive: yes

 6 TIMING & RECORDING:
  Time source      : GPS 1PPS  
  Sensor           : QHY 174M GPS
  Mode of recording: 1920x1200, 12 bit FITS, bin 1x1, Gain=450
  Mode of recording: Contrast=0, Brightness=0, Gamma=1, USB traffic=50
  Shutter          : 0.100 s
  Recording        : Laptop Dell Latitiude 3540 (Intel Core i5/RAM 8 GB/SSD 128 GB)
  Recording        : SharpCap 4.0.8115

 7 OBSERVING CONDITIONS: 
  Atmospheric transparency          : good 
  Wind  (m/s)                       : 5
  Temperature (deg C / humid.)      : 5 / 75
  Star image stability              : good 
  Minor planet visible              : no
  Local conditions (degree)         : star altitude: 52, sun altitude: -10
  Local moon conditions (degree)    : moon altitude: 13, moon distance: 97, moon phase: -5%

 8 ADDITIONAL COMMENTS:
  Observed star                           : TYC 1216-00557-1 
  Star magnitude (mag)                    : 10.0
  Minor planet magnitude (mag)            : 19.6
  Feed                                    : UKOCL, last updated Aug 22, 2021
  Rank                                    : 13
  Distance (km)                           : in the 1-sigma zone, 8 km outside the shadow path
  Shadow width (km)                       : 16
  Predicted probability OccultWatcher (%) : 7.5
  Predicted combined magnitude (mag)      : 10.0 
  Faintest star on movie (mag)            : 11.5
  Evaluation with Tangra 3.7.3 

  9 REMARKS: