+--------------------------------+ +--------------------------------+ ASTERIODAL OCCULTATION - REPORT FORM +--------------------------------+ +--------------------------------+ EAON & IOTA-ES EUROPEAN ASTEROIDAL OCCULTATION NETWORK INTERNATIONAL OCCULTATION TIMING ASSOCIATION EUROPEAN SECTION +--------------------------------+ +--------------------------------+ 1.DATE: 2013/04/25 STAR: TYC 2958-00867-1 ASTEROID: (536) Merapi 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 13.4 (WGS84) Longitude: E 15 14 08.3 (WGS84) Altitude: 594m (WGS84) Single/Multiple: Single +--------------------------------------------------------------------+ 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: 21:26:42 E: 21:28:17 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 Motor drive: Yes 6.TIMING & RECORDING: Timekeeping: GPS 1PPS, GlobalSat EM-406A GPS Board + IOTA-VTI (Demo3) V1.1.43 Sensor/Camera: WAT-120N, CCIR, 1/2" Sony CCD-Sensor ICX419ALL Mode of recording: It=160ms (6.25 Img/s), Video CCIR, Y800, uncompressed AVI Device of recording: TIS DFG/USB2-lt Videograbber USB2.0 (Y800), Notebook Harddisk Time insertion: IOTA-VTI 7.OBSERVING CONDITIONS: Atmospheric transparency: good Wind: no Star image stability: good Minor planet visible: no Temperature: 285 Kelvin (+12 deg Celsius) 8.ADDITIONAL COMMENTS: Target star TYC 2958-00867-1, +11.5mag, 36deg Elevation. Only Clear glass filter (Astronomik) for CCD protection was used. Due to a full moon and bright sky background a longer It had to be used. Video evaluation accomplished with VirtualDub 1.10.0, Tangra v1.4.0.496 Event data details according to the predictions from EAON. Predicted event time was 21:27:15 UTC (+/- 4s) for my observing position. Predicted maximum duration was 7.2 seconds with a 3.2mag drop. Position was 327km from predicted central line in SW direction between 1-sigma and 2-sigma limit with a probability of 5.2%. No occultation event detected (It=160ms). 3-D Position and timing GlobalSat EM-406A GPS Board Receiving 07 satellites Horizontal Dilution of Precision 1.0 Geoidal separation 44.6m (Altitude 549.0MSL + 44.6 = 593.9 m in WGS84 datum) Gerhard Dangl gerhard@dangl.at www.dangl.at/ +--------------------------------------------------------------------+