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                 ASTERIODAL OCCULTATION - REPORT FORM

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           	           EAON & IOTA-ES

               EUROPEAN ASTEROIDAL OCCULTATION NETWORK

    INTERNATIONAL OCCULTATION TIMING ASSOCIATION EUROPEAN SECTION

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1.DATE: 2020/04/25
  STAR: UCAC4 496-064872
  ASTEROID: (471325) 2011 KT19

2.OBSERVER:
  	Name: Gerhard Dangl
	Phone: ++43-(0)2842-53908
	Address: AUSTRIA, A-3830, Nonndorf 12
	E-mail: gerhard@dangl.at

3.OBSERVING STATION:
	Nearest city: Waidhofen an der Thaya
        Station: Nonndorf - C47
	Latitude: N 48 47 13.4 (WGS84)
	Longitude: E 15 14 08.3 (WGS84)
	Altitude: 599m (WGS84), 554m (MSL)
	Single/Multiple: Single

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4.TIMING OF EVENTS:
	Occultation recorded: NEGATIVE
	Type of event:
	"S"tart observation; "I"nterrupt-"s"tart; "D"isappearance;
	"B"link; "F"lash; "E"nd observation; "I"nterrupt-"e"nd;
	"R"eappearance; "O"ther (specify)
	
	Personal Equation Substracted: No
	Event Time (UT)		P.E. Accuracy + Comments
	code: HH:MM:SS.ss       S.ss  S.ss
	
	S:    20:44:45

	E:    20:51:37
	
5.TELESCOPE:
	Type: Newton
	Focal length: 1200mm
 	Aperture: 254 mm
	Magnification: video/primary focus/FOV 18.3'x13.7' (768x576, 1.43"x1.43" per pixel)
	Mount: Equatorial, EQ8
	Motor drive: Yes

6.TIMING & RECORDING:
	Timekeeping: GPS Sensor Garmin GPS18xLVC
        Sensor/Camera: WAT-910BD System TACOS, CCIR, 1/2" CCD-Sensor
	Mode of recording: It=160ms (6.25 Img/s) to It=1280ms (0.78125 Img/s), Interlaced Video CCIR, Y800, uncompressed AVI
	Device of recording: TIS DFG/USB2-lt Videograbber USB2.0 (Y800), Notebook with SSD and OS W7/64P
        Time insertion: GPS time with VTI KIWI-OSD

7.OBSERVING CONDITIONS:
	Atmospheric transparency: very bad (clouds)
	Wind: no
	Star image stability: fair
	Minor planet visible: no
	Temperature: 279 Kelvin (+06 deg Celsius)
	
8.ADDITIONAL COMMENTS:
        Target star UCAC4 496-064872, +12.5mag, 27deg Elevation.

        Because of a clouded sky I had to change It dynamical and fast via one mouse click (possible with WAT-910BD System TACOS).
        In this way I changed It in the range from 160ms to 1280ms in four steps (160ms, 320ms, 640ms and 1280ms) up and down.
        The exposure time increase was always possible before the star became invisible on the Laptop PC. On the other side if the star
        was bright enough I immediately shortened the exposure time to get best time resolution.
        The exposure time was changed nine times (4x up, 5x down) during this recording.
        And the target star is visible in every integration sequence of the recording.
        
        Video evaluation accomplished with VirtualDub 1.10.0 and Tangra 3.7.0

        Event data details according to the predictions from Occult Watcher Feed LuckyStar.
        Predicted event time was 20:47:48 UTC (+/- 47sec) for my observing position.
        Predicted maximum duration was 5.0 seconds with a 9.3mag drop.
        Position was 278km from predicted central line in SSW direction
        between path edge and 1-sigma line with a probability of 3.9%.
        No occultation event detected (It=160ms to 1280ms).
        
        3-D Position
	Garmin GPS18x LVC (Update of Almanac data before recording start)
        Receiving 08 satellites
        Horizontal Dilution of Precision 1.1
        Geoidal separation 44.5m (Altitude 554.4MSL + 44.5 = 598.9 m in WGS84 datum)

        Gerhard Dangl
        gerhard@dangl.at
        www.dangl.at/
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