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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: 2007/05/20
  STAR: TYC 0837-01410-1
  ASTEROID: (399) Persephone

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/Thaya
	Latitude:  N 48 47 26.9 (WGS84)
	Longitude: E 15 13 52.5 (WGS84)
	Altitude:  603m         (WGS84)
	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:    22:33:58

        D:    22:36:34.70      0.00  0.01    (D:time +/-20ms)
        R:    22:36:39.32      0.00  0.01    (R:time +/-40ms)   
                                              Duration 4.62s (+/-60ms)
	E:    22:39:20         
	
5.TELESCOPE:
	Type: Newton
	Focal length: 1200mm
 	Aperture: 254 mm
	Magnification: video/primary focus/FOV 18.5'x13.8'/1.5" per pixel
	Mount: Equatorial
	Motor drive: Yes

6.TIMING & RECORDING:
	Timekeeping: GPS 1PPS Garmin 18 LVC + KIWI-OSD
        Sensor/Camera: WAT-120N, CCIR, 1/2" Sony CCD-Sensor ICX419ALL
	Mode of recording: It=320ms (3.125 Img/s), Video CCIR, AVI, YUY2, Huffyuv,
	Device of recording: Xpert V-Stream Videograbber USB2.0, Notebook Harddisk
        Time insertion: KIWI-OSD 

7.OBSERVING CONDITIONS:
	Atmospheric transparency: fair
	Wind: 0 - 1m/s
	Star image stability: fair
	Minor planet visible: No
	Temperature: 288 Kelvin (+15 deg Celsius)
	
8.ADDITIONAL COMMENTS:
        Video evaluation accomblished with VirtualDub1.6.16 and Limovie0.9.25f_beta
        It=320ms (WAT-120N CCIR in Mode 8x)
        
        Disappearance (inserted times on video)
        It Sequence: 22:36:34.718 - 22:36:35.038 star full ON
        It Sequence: 22:36:35.038 - 22:36:35.358 star full OFF

        Reappearance (inserted times on video)
        It Sequence: 22:36:39.198 - 22:36:39.518 star full OFF
        It Sequence: 22:36:39.518 - 22:36:39.838 star partial ON (55% = 176ms)
        It Sequence: 22:36:39.838 - 22:36:40.158 star full ON

        According to http://www.dangl.at/ausruest/vid_tim/vid_tim1.htm
        all times were corrected now by -340ms (WAT-120N CCIR in Mode 8x).
        Several measurements of partial reappearance sequence with different
        Limovie settings resulted all within +/- 40ms.

        Only Clear glass filter (Astronomik) for CCD protection was used

        Target star TYC 0837-01410-1, +11.4mag, 14deg Elevation
        Limit on recorded video fields (It=320ms) GSC 837 1421, +12.8mag

        3-D Position and timing
	Garmin GPS18 LVC
        Receiving 11 satellites
        Horizontal Dilution of Precision 0.8
        Geoidal separation 44.4m (Altitude 558.9MSL + 44.4 = 603.3m in WGS84 datum)

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