ASTEROIDAL OCCULTATION - REPORT FORM

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

1 DATE:                  2022 February 26       21:05:51 (UTC)

  STAR:                  UCAC4 528-013492       mv: 14.00 mag
  ASTEROID:              (683) Lanzia           mv: 14.20 mag  (diam. 83 km)
                         combined magnitude:    mv: 13.30 mag
                         delta-magnitude:       mv:  0.86 mag

2 OBSERVER: 
  Name:                  Jonas SCHENKER / Josef KAESER / 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 17 km North-East of the predicted center line)
  With of path:          107  km
  Probability:           99.9 %
  Feed:			 UKOCL
  
  Single station:        Jonas SCHENKER / Josef KAESER

                         +----------------------------------+
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     21 03 35                    : Start observation (UTC)
   D     21 05 37.90     +/- 0.08  s : Disappearance     (UTC)
   R     21 05 53.74     +/- 0.08  s : Reappearance      (UTC)
   E     21 08 13                    : End observation   (UTC)

   Duration:   15.84  s  +/- 0.16  s : (predicted: max. 10.8 s)

   M     21 05 45.82	 +/- 0.08  s : Mid-event         (UTC)
   P     21 05 51	 +/- 3.00  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:         LogiLink VG0005B USB2.0
  Time  insertion:       Video Time Inserter IOTA-VTI v3 with GPS
			 Video frame time (Vt)

7 OBSERVING CONDITIONS:
  Atmospheric transp.:   good
  Wind:                  5.0   m/s NE
  Temperature:           -2   °C
  Relative humidity:     76    %
  Atmospheric pressure:  1031  hPa
  Moonlight:             no   (Moon below horizon)
  Star image stability:  good (occulted star 45° above horizon)
  Minor planet visible:  yes  (brightness 14.2 mag)
  
8 ADDITIONAL COMMENTS:    
  Shutter mode:                x8
  Integration time (It)  =     0.16  s
  Correction time  (Ct)  =    -0.10  s (evaluation in frames)
  Tolerance value        =  +/-0.08  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 v3.7.3

  No evidence of any satellite was found in the range of -130/+135 seconds.

9 CREDITS:
  Many thanks to Josef Kaeser for the helpful support.