+--------------------------------+ +--------------------------------+ ASTERIODAL OCCULTATION - REPORT FORM +--------------------------------+ +--------------------------------+ EAON & IOTA-ES EUROPEAN ASTEROIDAL OCCULTATION NETWORK INTERNATIONAL OCCULTATION TIMING ASSOCIATION EUROPEAN SECTION +--------------------------------+ +--------------------------------+ 1.DATE: 2008/06/08 STAR: TYC 0590-00083-1 ASTEROID: (304) Olga 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 28.4 (WGS84) Longitude: E 15 13 59.8 (WGS84) Altitude: 600m (WGS84) Single/Multiple: Single +--------------------------------------------------------------------+ 4.TIMING OF EVENTS: Occultation recorded: UNCERTAIN 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: 23:58:31 D: 00:00:56.471 0.00 (+0.24,-0.01) R: 00:00:56.811 0.00 (+0.01,-0.24) Event mid time 00:00:56.641 E: 00:04:04 5.TELESCOPE: Type: Newton Focal length: 1200mm Aperture: 254 mm Magnification: video/primary focus/FOV 15.8'x13.7' (640x576, 1.48"x1.43" 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, 768x576 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: bad Wind: No Star image stability: bad Minor planet visible: No Temperature: 285 Kelvin (+12 deg Celsius) 8.ADDITIONAL COMMENTS: Due to low elevation and fog or haze from rain until 2 hours before the event time this observation was really a challenge. Path width on my position with Asteroid in very low elevation was 586 kilometers. The 1 sigma uncertainty interval was +/- 0.29 path widths. My position was 384 kilometers (South) from predicted path central line in 1-sigma zone. The predicted occultation probability on my position was 29.5% The estimated maximum duration was 2.6 seconds with a drop of 4.3mag. Predicted occultation time for my position was 00:00:57 UTC. Target star TYC 0590-00083-1, +9.6mag, only 5.1deg Elevation (rising). Faintest object visible on live video fields was star TYC 0590-00147, +10.4mag. Only Clear glass filter (Astronomik) for CCD protection was used. Video evaluation accomblished with VirtualDub1.7.8 and Limovie0.9.28c Partial (integrated level <35%) but clear disappearance in one integration time frame detected. Integration time frame was 8 CCIR video frames = 320ms. Possible but uncertain occultation with a maximum length of 340ms or in all probability shorter. Real D/R times determined from recorded video with the use of the correction table at http://www.dangl.at/ausruest/vid_tim/vid_tim1.htm#wat_120n 3-D Position and timing Garmin GPS18 LVC Receiving 09 satellites Horizontal Dilution of Precision 0.9 Geoidal separation 44.4m (Altitude 556.0MSL + 44.4 = 600.4m in WGS84 datum) Gerhard Dangl gerhard@dangl.at www.dangl.at/ +--------------------------------------------------------------------+