ASTEROIDAL OCCULTATION - REPORT FORM

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

 1 DATE: 3 January 2022                        STAR: UCAC4 555-012770 

  ASTEROID: 1991 OL1                           No: 9858

 2 OBSERVER : 
  Name      : Anna Marciniak                     Abrr:
  Address   : Astronomical Observatory Institute, A. Mickiewicz University, Sloneczna 36, Poznan, Poland

 3 OBSERVING STATION: 
  Nearest city : Poznan
  Station      : Chalin          IAU obs code: -
  Latitude     : 52 36 14.0 N   
  Longitude    : 16 02 33.4 E   
  Altitude     : 123 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  - 18:59:51.57   -    - 0.01
  D  - - 
  R  - -
  E  - 19:00:52.93   -    - 0.01 

  
  Was your reaction time applied to the above timings? - not applicable.
  
 5 TELESCOPE: 
  Type        : Cassegrain f/0.19                      Aperture   : 350 mm
  Focal length: 1855 mm                                FOV        : 19'x 21'
  Mount       : altazimuth                             Motor drive: yes

 6 TIMING & RECORDING:
  Time source      : GPS++
  Sensor           : Andor Zyla 5.5 camera with sCMOS sensor
  Mode of recording: Binning 4x4, Image size: Full
  Shutter (SENS-UP): Electronic, Rolling
  Recording        : Personal Computer
  Recording        : Own software
  Time insertion   : Start exposure times inserted into FITS headers with own software

 7 OBSERVING CONDITIONS: 
  Atmospheric transparency          : good 
  Wind  (km/h)                      : 18
  Temperature (deg C / humid.)      : +9 deg C / humidity 71 %
  Star image stability              : good
  Minor planet visible              : no
  Local conditions (degree)         : star height: 50, Sun height: -36, 
  Local moon conditions (degree)    : Moon height: below horizon

 8 ADDITIONAL COMMENTS:
  Star magnitude                          : 12.1
  Minor planet magnitude                  : 18.0
  Feed                                    : CentralEurope
  Distance (km)                           : 16.3 km
  Faintest star on CCD (mag)              : 13.5
  Exposure time		                  : 0.12 s 
  Readout time			          : 0.01 s

  Predicted max. duration (secs) :  1.2  
  Predicted max. drop (mag)      :  5.9
  Predicted mid-event (UT)       :  19:00:49
  Predicted error in time (secs) :  4.7
  Probability			 :  14.7%
  
  Clouds came in 4 seconds after the predicted time, still within the predicted time error range. No occultation until this time.

  Reduction by Julia Perla