+--------------------------------+ +--------------------------------+ ASTERIODAL OCCULTATION - REPORT FORM +--------------------------------+ +--------------------------------+ EAON & IOTA-ES EUROPEAN ASTEROIDAL OCCULTATION NETWORK INTERNATIONAL OCCULTATION TIMING ASSOCIATION EUROPEAN SECTION +--------------------------------+ +--------------------------------+ 1. DATE: 08 Mar 2014 STAR: 4UC 514-024427 ASTEROID: (51) Nemausa 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: No Event Time (UTC) Accuracy + Comments code: HH:MM:SS.ss S.ss -S : 18:53:12 -D : 18:55:40.22 ± 0.15 -R : 18:55:51.98 ± 0.15 -E : 18:58:03 Duration: 11.78 s ± 0.30 s 5. TELESCOPE Type: Schmidt-Cassegrain, Celestron 11-inch Aperture: 280mm Focal length: 850mm (with focal reducer) Magnification: FOV about 27x21arcmin Mount: Equatorial Motor drive: Yes 6. TIMING & RECORDING Timekeeping: GPS 1PPS (US Global Sat EM-406A) Sensor/Camera: Videocamera WAT-910HX, CCIR, 1/2", ICX429ALL sensor Videocamera settings: Shutter=x16; Gain=39dB; Gamma=1.00 Device of recording: Personal computer, Imaging Source DFG/SV1 PCI, S-video, Virtualdub software, saved on Harddisk Mode of recording: Integration time=0.320s, CCIR, Huffyuv Time insertion device: IOTA-VTI, v.1.1.42 7. OBSERVING CONDITIONS Atmospheric transparency: fair Wind: no Star image stability: good Minor Planet Visible: yes, during the event 8. ADDITIONAL COMMENTS Tangra was used to plot the lightcurve. A correction time of -0.180s was applied because of the use of a WAT-910HX in shutter mode=x16. Occular v.4.00 was used to extract the D and R times. A measured lightdrop of 0.42mag instead of the predicted 0.38mag was observed. A lightcurve can be seen here: http://www.sposetti.ch/images/stories/Minor_planets/2014_mar_8_Neumasa_Sposetti.png