+--------------------------------+ +--------------------------------+ ASTERIODAL OCCULTATION - REPORT FORM +--------------------------------+ +--------------------------------+ EAON & IOTA-ES EUROPEAN ASTEROIDAL OCCULTATION NETWORK INTERNATIONAL OCCULTATION TIMING ASSOCIATION EUROPEAN SECTION +--------------------------------+ +--------------------------------+ 1. DATE: 17 FEB 2012 STAR: 2UCAC 26033121 ASTEROID: (50000) Quaoar 2. OBSERVER Name: Stefano SPOSETTI Address: 6525 GNOSCA - Switzerland Email: stefanosposetti@ticino.com 3. OBSERVING STATION Nearest city: CH-6500 Bellinzona Longitude: 9d 1m 26.5s (E) Latitude: 46d 13m 53.2s (N) Altitude: 260m (WGS84) 4. TIMING OF EVENTS Occultation recorded: POSITIVE Type of event: "S"tart observation; "I"nterrupt-start; "D"isappearance; "B"link; "F"lash; "E"nd observation; "I"nterrupt-end; "R"eappearance; "O"ther (specify) Personal Equation Substracted: - Event Time (UTC) Accuracy + Comments code: HH:MM:SS.ss S.ss -S : 04:16:00 -D : 04:28:42.7 (+/- 10.2s) -R : 04:29:13.4 (+/- 10.2s) Duration 3*10.24s=30.72s (+/- 14.4s) Mid event 04:28:58.0 (+/- 10.2s) -E : 04:45:00 Correction because of the use of WAT120N+ applied (see 8. ADDITIONAL COMMENTS). 5.TELESCOPE: Type: Newtonian Aperture: 400mm Focal length: 930mm (with focal reducer) FOV: 23x18arcmin Mount: equatorial Motor drive: yes 6. TIMING & RECORDING Timekeeping: GPS 1PPS (US Global Sat EM-406A) Sensor/Camera: Videocamera WAT-120N+, CCIR, 1/2" Sony CCD-Sensor ICX419ALL Videocamera settings: Shutter mode: 9, Gain: between LO and HI , Gamma: HI Device of recording: Personal computer, TV-AV PCI-TV7130, Composite-input Virtualdub software, saved on Harddisk Mode of recording: Integration time=10.24s, CCIR, Huffyuv Time insertion device: IOTA-VTI, v.1.1.42 7. OBSERVING CONDITIONS Atmospheric transparency: poor Wind: no Star image stability: good-fair Minor Planet Visible: no 8. ADDITIONAL COMMENTS Because of the use of a WAT-120N+ in shutter mode 9 (Integration time=10.24s) a correction of -5.15s was performed at the video inserted times in accordance with the correction value table published here: http://www.dangl.at/ausruest/vid_tim/vid_tim1.htm#wat120+ccir Poor sky conditions: about +3mag naked-eye-limiting-magnitude around the target location. Airmass of the target: 3.23 Horizon coordinates of the target: Azm: 138deg , Elev: 18deg (SE direction) Virtualdub(C) was used to rise contrast. Tangra(C) was used to evaluate the event in the avi files.