+--------------------------------+ +--------------------------------+ ASTERIODAL OCCULTATION - REPORT FORM +--------------------------------+ +--------------------------------+ EAON & IOTA-ES EUROPEAN ASTEROIDAL OCCULTATION NETWORK INTERNATIONAL OCCULTATION TIMING ASSOCIATION EUROPEAN SECTION +--------------------------------+ +--------------------------------+ 1. DATE: 31 Oct 2015 STAR: 2UCAC 29389633 ASTEROID: (1075) Helina 2. OBSERVER Name: Stefano SPOSETTI Address: 6525 GNOSCA - Switzerland Email: stefanosposetti@ticino.com 3. OBSERVING STATION Nearest city: CH-6525 Gnosca 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 : 20:56:07 -D : 21:04:57.41 ± 0.16 s -R : 21:04:58.37 ± 0.16 s -E : 21:08:00 duration: 0.96 s ± 0.32 s TELESCOPE Type: Schmidt-Cassegrain, Celestron 11-inch Aperture: 280mm Focal length: about 900mm (with focal reducer) Magnification: FOV 23x18arcmin Mount: Equatorial Motor drive: Yes 6. TIMING & RECORDING Timekeeping: KIWI-OSD with GPS Garmin 18 LVC Sensor/Camera: Videocamera WAT-910HX, CCIR, 1/2", ICX429ALL sensor Videocamera settings: Shutter=x16; Gain=high; Gamma=1.00 Personal computer, Imaging Source DFG/SV1 PCI, S-video, CCIR, Virtualdub software, saved on Harddisk, Huffyuv Timekeeping: GPS 1PPS (US Global Sat EM-406A) Time insertion device: IOTA-VTI, v.1.1.42 Integration time: 0.32 s 7. OBSERVING CONDITIONS Atmospheric transparency: fair (some thin clouds) Wind: no Star image stability: good Minor Planet Visible: no 8. ADDITIONAL COMMENTS -Tangra v. 3.5 was used to produce the lightcurve. -A correction of -0.180 s was performed because of the use of an integrating camera. -A lightcurve can be seen here: http://sposetti.ch/wp-content/uploads/2014/09/2015_Oct_31_Helina.png