+--------------------------------+ +--------------------------------+ ASTERIODAL OCCULTATION - REPORT FORM +--------------------------------+ +--------------------------------+ EAON & IOTA-ES EUROPEAN ASTEROIDAL OCCULTATION NETWORK INTERNATIONAL OCCULTATION TIMING ASSOCIATION EUROPEAN SECTION +--------------------------------+ +--------------------------------+ 1.DATE: 2009/09/07 STAR: TYC 5254-00041-1 ASTEROID: (561) Ingwelde 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 13.5 (WGS84) Longitude: E 15 14 08.2 (WGS84) Altitude: 599m (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: 21:20:36 D: 21:22:39.742 It is most likely that this R: 21:22:39.822 was not a real occultation. (see comments) E: 21:25:04 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 Garmin 18x LVC + KIWI-OSD Sensor/Camera: WAT-120N, CCIR, 1/2" Sony CCD-Sensor ICX419ALL Mode of recording: It=80ms (12.5 Img/s), Video CCIR, AVI, YUY2, Huffyuv, Device of recording: TIS DFG/USB2-lt Videograbber USB2.0, Notebook Harddisk Time insertion: KIWI-OSD 7.OBSERVING CONDITIONS: Atmospheric transparency: good Wind: No Star image stability: good Minor planet visible: No Temperature: 281 Kelvin (+08 deg Celsius) 8.ADDITIONAL COMMENTS: Target star TYC 5254-00041-1, +11.5mag, 31deg Elevation. Faintest object visible on live video fields (It=80ms) was star GSC 5254 56, +12.7mag. Only Clear glass filter (Astronomik) for CCD protection was used. Video evaluation accomplished with VirtualDub1.8.6, AviSynth2.5 and Limovie0.9.29b Inserted video times corrected with values from WAT-120N table at: http://www.dangl.at/ausruest/vid_tim/vid_tim1.htm A star signal slope within one integration sequence of It=80ms was detected. Time of this event was near to the predicted occultation time 21:22:42 UTC. And signal dropped to the lowest level within the whole video record. But because the star brightness did not fall to background level in this four video fields (80ms) it is most likely that the time span with the star signal on background level was shorter and so in the range of about 20 - 40 ms. So this could have been a short seeing effect too. Because of this and the circumstance that a second star TYC 5255 63 with +11.9mag showed a nearly simultaneous slope in the signal I would not trust that this was a short but real occultation. So my reported result for this event is negative. 3-D Position and timing Garmin GPS18x LVC Receiving 10 satellites Horizontal Dilution of Precision 0.8 Geoidal separation 44.5m (Altitude 554.8MSL + 44.5 = 599.3 m in WGS84 datum) Gerhard Dangl gerhard@dangl.at www.dangl.at/ +--------------------------------------------------------------------+