ASTEROIDAL OCCULTATION - REPORT FORM

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

1 DATE:                  2020 May 31  00:43:38  (UTC)

  STAR:                  UCAC4 360-087733       mv: 13.7  mag
  ASTEROID:              (34602) 2000 TO57 	mv: 17.7  mag  (diam. 7.502 km)
                         combined magnitude:    mv: 13.7  mag
                         delta-magnitude:       mv:  4.0  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: no (located 213 km North-West of the predicted center line)
  With of path:          15   km
  Probability:           1.8  %
  
  Single station:        Jonas SCHENKER & Joseph KAESER

                         +----------------------------------+
4 TIMING OF EVENT:       |                                  |
                         |  OCCULTATION RECORDED: NEGATIVE  |
                         |                                  |
                         +----------------------------------+
  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     00 41 29        +/-0.040 s : Start observation (UTC)
   D     -- -- --.---    +/-0.040 s : Disappearance     (UTC)
   R     -- -- --.---    +/-0.040 s : Reappearance      (UTC)
   E     00 45 55        +/-0.040 s : End observation   (UTC)

   Duration:    -.--- s  +/-0.040 s : (predicted: max. 0.7 s)

   M     -- -- --.---	 +/-0.040 s : Mid-event         (UTC)
   P     00 43 38	 +/-9.000 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.:   good
  Wind:                  3.2   m/s from NE
  Temperature:           +9    °C
  Relative humidity:     72    %
  Atmospheric pressure:  1017  hPa
  Moonlight:             yes   (60%, 86° distant of occulted star)
  Star image stability:  good  (occulted star 24° above horizon)
  Minor planet visible:  no    (brightness 17.7 mag)
  
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 -129/+137 seconds.

9 CREDITS:
  Joseph Kaeser for helpful assistance.