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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: 2019/09/24
  STAR: TYC 0040-00504-1
  ASTEROID: (113) Amalthea

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
	Latitude:  N 48 47 13.5 (WGS84)
	Longitude: E 15 14 08.3 (WGS84)
	Altitude:  601m         (WGS84)
                   556m         (MSL)
	Single/Multiple: Single

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4.TIMING OF EVENTS:
	Occultation recorded: POSITIVE
	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:    22:22:44

	D:    22:24:09.581 (+/-0.01s)
        R:    22:24:15.801 (+/-0.01s)    Duration        6.220 (+/-0.02s)
                                         Mid time 22:24:12.691 (+/-0.02s)

	E:    22:26:18   
	
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=20ms (50 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: good
	Wind: no
	Star image stability: fair
	Minor planet visible: separated until few minutes before occultation
	Temperature: 284 Kelvin (+11 deg Celsius)
	
8.ADDITIONAL COMMENTS:
        Target star TYC 0040-00504-1, +10.9mag, 36deg Elevation.
        Asteroid (113) Amalthea, +12.4mag.
        Star and Asteroid combined +10.7mag.
        Only Clear glass filter (Astronomik) for CCD protection was used.

        Video evaluation accomplished with VirtualDub 1.10.0 and Tangra 3.6.19

        Because of the use of a WAT-910BD System TACOS, CCIR in non integration mode (It=20ms),
        a correction of -20ms was performed at the times inserted in the video by the VTI.
	http://www.dangl.at/ausruest/vid_tim/vid_tim1.htm#wat910hxccir
        The correction value is according to measurements results with EXposure Time Analyzer - EXTA.
        http://www.dangl.at/exta/exta_e.htm
        So all event times in this report are corrected times representing the real event times in UTC.

        Event data details according to the predictions from Occult Watcher Feed IOTA (Steve Preston).
        Predicted event time was 22:24:09 UTC (+/- 2s) for my observing position.
        Predicted maximum duration was 5.4 seconds with a 1.7mag drop.
        Position was -0.3km from predicted central line in SW direction
        between central line and path edge with a probability of 99.5%.
        Occultation event detected with duration 6.22s +/-0.02s (It=20ms).
        
        3-D Position and timing
	Garmin GPS18x LVC (Update of Almanac data before recording start)
        Receiving 10 satellites
        Horizontal Dilution of Precision 1.0
        Geoidal separation 44.5m (Altitude 556.0MSL + 44.5 = 600.5 m in WGS84 datum)

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