+--------------------------------+ +--------------------------------+ ASTERIODAL OCCULTATION - REPORT FORM +--------------------------------+ +--------------------------------+ EAON & IOTA-ES EUROPEAN ASTEROIDAL OCCULTATION NETWORK INTERNATIONAL OCCULTATION TIMING ASSOCIATION EUROPEAN SECTION +--------------------------------+ +--------------------------------+ 1. DATE: 04 Oct 2018 STAR: TYC 0754-01369-1 ASTEROID: (2111) Tselina 2. OBSERVER Name: Stefano SPOSETTI Address: 6525 GNOSCA - Switzerland Email: stefanosposetti@ticino.com 3. OBSERVING STATION Nearest city: CH-6525 Gnosca Station: 143 Longitude (DD MM SS.s): 09 01 26.5 (E) Latitude (DD MM SS.s): 46 13 53.2 (N) Altitude: 260 m (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.sss -S : 02:29:33 -D : 02:30:24.11 ± 0.040 s -R : 02:30:25.59 ± 0.040 s -E : 02:31:05 Duration: 1.48 s ± 0.080 s 5. TELESCOPE -Type: Schmidt-Cassegrain, Celestron 11-inch -Aperture: 280 mm -Focal length: 930 mm (with focal reducer) -Magnification: FOV 23x18 arcmin -Mount: Equatorial -Motor drive: No 6. TIMING & RECORDING -Camera/Sensor: Videocamera WAT-910HX-RC, CCIR, 1/2" -Videocamera settings: Shutter = x4, Gain = 41/41, Gamma = 1.00 -Device of recording: Personal computer -Grabber: Imaging Source DFG/SV1 PCI, composite input -Software: Virtualdub v. 1.10.4, saved on Harddisk as Lagarith compressed file -Time insertion device: IOTA-VTI, v.1.1.42 -Timekeeping: GPS 1PPS (US Global Sat EM-406A) -Integration time: 0.080 s 7. OBSERVING CONDITIONS -Atmospheric transparency: good -Wind: none -Star image stability: fair/good -Minor Planet visible during the occultation: no 8. ADDITIONAL COMMENTS Prediction: -Occultwatcher, IBEROC feed -Rank: 26 -Probability: 13.9 % -Combined magnitude: 11.7 mag -Star magnitude: 11.7 mag -Asteroid magnitude: 15.8 mag -Lightdrop: 4.3 mag, 4.2 magR -Max duration: 1.6 s -Event time: 04:30:21 UT -Error in time: 4 s -Moon distance: 26 deg -Moon illumination: 31 % Other comments: -Automatic observation -Target sky position: elevation = 41 deg, azimut = 121 deg -Tangra v. 3.6.15 was used to generate the lightcurve (aperture photometry, average background) -A correction of - 0.060 s was applied because of the use of an integration camera (so called "Dangl-correction") -A lightcurve can be seen here: http://sposetti.ch/wp-content/uploads/2018/10/2018_10_04_Tselina_Gnosca.png