+--------------------------------+ +--------------------------------+ ASTERIODAL OCCULTATION - REPORT FORM +--------------------------------+ +--------------------------------+ EAON & IOTA-ES EUROPEAN ASTEROIDAL OCCULTATION NETWORK INTERNATIONAL OCCULTATION TIMING ASSOCIATION EUROPEAN SECTION +--------------------------------+ +--------------------------------+ 1.DATE: 2011/05/14 STAR: 1B 745-220584857 ASTEROID: TNO (50000) Quaoar 2.OBSERVER: Name: Gerhard Dangl Phone: ++43-(0)2842-53908 Address: AUSTRIA, A-3830, Nonndorf 12 E-mail: gerhard@dangl.at 3.OBSERVING STATION: Nonndorf, MPC station code C47 Latitude: N 48 47 13.6 (WGS84) Longitude: E 15 14 08.2 (WGS84) Altitude: 592m (WGS84) 547m (MSL) 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: 01:03:59 Is: 01:09:48 Ie: 01:12:16 Interruption of 148s due to bad/lost USB connection E: 01:27:15 5.TELESCOPE: Type: Newton Focal length: 1200mm Aperture: 254 mm Field flattener: Baader Multi Purpose Coma Corrector MPCC Magnification: CCD/primary focus/FOV 25.7'x19.2' (1391x1039, 1.11"x1.11" per pixel) Mount: Equatorial Motor drive: Yes 6.TIMING & RECORDING: Timekeeping: Timeserver ts2.aco.net in Vienna via WLAN from 2MBit/s cable router in house Sensor/Camera: Atik 314L+, B/W, 2/3" Sony CCD-Sensor ICX285AL, CCD temperature 263 Kelvin (-10 deg Celsius) Mode of recording: Binning 1x1, It=15s, download time 2s, duty cycle of data collection 88.2% Device of recording: USB2.0 connection to notebook, Notebook Harddisk Time insertion: Exposure start time in FITS header by capture software Artemis Capture V3.10 7.OBSERVING CONDITIONS: Atmospheric transparency: bad Wind: No Star image stability: fair Minor planet visible: No Temperature: 279 Kelvin (+06 deg Celsius) 8.ADDITIONAL COMMENTS: Target star at position: RA 17h 28m 13.3s, DEC -15° 26' 3.5", +16.2mag, 26deg Elevation. Sky was not clear and sometimes thin haze moved also through the target sky region. The exposure time was chosen as short as possible to get a useful resolution in time. But exposure time had to be long enough to show the target star over the image background noise. No wavelength limiting filter and no clear glass filter for CCD protection was used. CCD FITS images evaluation was accomplished manually with Astrometrica 4.6.6.394 and Fitswork 4.42 Predicted maximum occultation duration was 57.1 seconds with a 3.0mag drop. No occultation event >30s detected (It=15s). Gerhard Dangl gerhard@dangl.at www.dangl.at/ +--------------------------------------------------------------------+