ASTEROIDAL OCCULTATION - REPORT FORM

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

1 DATE:                  2019 April 22 01:20:52  (UTC)

  STAR:                  UCAC4: 376-077172       mv: 12.4  mag
  ASTEROID:              (145) Adeona	 	 mv: 12.5  mag  (diam. 127.783 km)
                         combined magnitude:     mv: 11.7  mag
                         delta-magnitude:        mv:  0.8  mag

2 OBSERVER: 
  Name:                  Jonas SCHENKER / Abbr: Schenker J Observatory
  E-mail:                jonas.schenker@sunrise.ch
  Address:               Ruetiweg 6, CH-5036 Oberentfelden, Switzerland

3 OBSERVING STATION: 
  Nearest city:          5000 Aarau, Switzerland
  Station:               Sternwarte Schafmatt (IAU Observatory Code: B77)
  Latitude:              N 47° 25' 12.88" (WGS84)
  Longitude:             E 07° 57' 02.95" (WGS84)
  Altitude:              820 m (MSL)      (WGS84)

  Predicted observation: yes (located 79 km south of the predicted center line)
  Probability:           94.7 %
  
  Single station:        Jonas SCHENKER

                         +----------------------------------+
4 TIMING OF EVENT:       |                                  |
                         |  OCCULTATION RECORDED: POSITIVE  |
                         |                                  |
                         +----------------------------------+
  Type of event:
   S = Start observation I = Interrupt-start   D = Disappearance
   B = Blink             F = Flash             E = End observation
   I = Interrupt-end     R = Reappearance      
   M = Mid-event         P = Predicted time

  Event  Time (UTC)      Accuracy     Comments
  Code   HH MM SS.sss    S.sss
  
   S     01 19 47        +/-0.040 s : Start observation (UTC)
   D     01 20 43.801    +/-0.040 s : Disappearance     (UTC)
   R     01 20 59.321    +/-0.040 s : Reappearance      (UTC)
   E     01 22 32        +/-0.040 s : End observation   (UTC)

   Duration:    15.520 s +/-0.040 s : (predicted: max. 17.8 s)

   M     01 20 51.561 	 +/-0.040 s : Mid-event         (UTC)
   P     01 20 52	 +/-4.000 s : Predicted time    (UTC)
        
5 TELESCOPE: 
  Type:                  Cassegrain Astrograph (LOMO / P. Keller)
  Aperture:              450 mm      
  Focal length:          1500 mm f/3.3 (primary focus) 
  Magnification:         focal (resulting field of view: 14.8' x 11.8')
  Mount:                 equatorial
  Motor drive:           yes

6 TIMING & RECORDING:
  Time source:           GPS unit: US Global Sat EM-406A (internal)
  Sensor:                1/2" Watec 910HX-RC (CCIR) (6.47 x 4.83 mm)
                         752 x 582 px (8.6 x 8.3 my) 
  Frame Grabber:         Hauppauge Analog Video Digitizer USB-Live 2
  Time  insertion:       Video Time Inserter IOTA-VTI v3 with GPS
			 Video frame time (Vt)

7 OBSERVING CONDITIONS:
  Atmospheric transp.:   poor  (dust from Sahara)
  Wind:                  3.9   m/s
  Temperature:           +12   °C
  Relative humidity:     45    %
  Atmospheric pressure:  1010  hPa
  Moonlight:             yes   (almost full moon, only 5° beside of the occulted star)
  Star image stability:  fair  (occulted star 27° above horizon)
  Minor planet visible:  yes   (brightness similar to the occulted star)

8 ADDITIONAL COMMENTS:    
  Shutter mode:               4 x 1/50 s (integration x4) 
  Integration time (It)  =    0.080 s
  Correction time  (Ct)  =   -0.060 s (evaluation in frames)
  Tolerance value        = +/-0.040 s (evaluation in frames)
  Video frame time       =    Vt
  Reported event time    =    Vt + Ct (correction time applied) 
  Video editing software:     VirtualDub v1.10.4
  Light measurement tool:     Tangra v3.6.18

  No evidence of any satellite was found in the range of +92/-56 seconds.

9 CREDITS:
  Sepp Kaeser for helpful assistance.