ASTEROIDAL OCCULTATION - REPORT FORM

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

 1 DATE: 13 April 2022                            STAR: G184611.6-055734

  ASTEROID: 1999 LN11                               No: 137205

 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  - 02:09:22.53  -    -  0.01
  D  -    -    -  
  R  -    -    -  
  E  - 02:11:37.32  -    -  0.01 
 
                         Duration :    -
                         Mid-event :   -
  
  Was your reaction time applied to the above timings? - not applicable.
  
 5 TELESCOPE: 
  Type        : Cassegrain f/5.3                       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, Global
  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)                      : 15
  Temperature (deg C / humid.)      :  5 deg C
  Star image stability              : good
  Minor planet visible              : no
  Local conditions (degree)         : star height: 25, Sun height: -16
  Local moon conditions (degree)    : Moon height: 10, Moon elongation: 122, Moon phase: 84%

 8 ADDITIONAL COMMENTS:
  Star magnitude                          : 12.5
  Minor planet magnitude                  : 20.2
  Feed                                    : ITALOccult
  Distance (km)                           :~20 km
  Faintest star on CCD (mag)              : 13.5
  Exposure time				  :  0.25 s 
  Readout time				  :  0.02 s

  Predicted max. duration (secs) :  2.15
  Predicted max. drop (mag)      :  7.7
  Predicted mid-event (UT)       : 02:10:07
  Predicted error in time (secs) :  4.4
  Probability			 : 31%

  Asteroid had wrongly assigned name (1999 LJ25), but correct number (137205) in ITALOccult feed.
  Data reductions by Antoine Choukroun.