+--------------------------------+ +--------------------------------+ ASTERIODAL OCCULTATION - REPORT FORM +--------------------------------+ +--------------------------------+ EAON & IOTA-ES EUROPEAN ASTEROIDAL OCCULTATION NETWORK INTERNATIONAL OCCULTATION TIMING ASSOCIATION EUROPEAN SECTION +--------------------------------+ +--------------------------------+ 1. DATE: 21 Apr 2018 STAR: TYC 0408-00029-1 ASTEROID: (130) Elektra 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: 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.sss -S : 00:30:56 -D : 00:31:35.05 ± 0.020 s -R : 00:31:51.23 ± 0.020 s -E : 00:32:19 Duration: 16.18 s ± 0.040 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-902H2 Ultimate, CCIR, 1/2" -Videocamera settings: AGC = LO, Gamma = OFF -Device of recording: Personal computer -Grabber: Imaging Source DFG/SV1 PCI, composite input -Software: Virtualdub v. 1.10.4, saved on Harddisk as Huffyuv compressed file -Time insertion device: IOTA-VTI, v.1.1.42 -Timekeeping: GPS 1PPS (US Global Sat EM-406A) -Integration time: 0.040 s 7. OBSERVING CONDITIONS -Atmospheric transparency: good -Wind: none -Star image stability: fair/good -Minor Planet visible during the occultation: barely 8. ADDITIONAL COMMENTS Prediction: -Occultwatcher, IOTA feed -Rank: 100 -Probability: 83.2 % -Combined magnitude: 11.3 mag -Star magnitude: 11.4 mag -Asteroid magnitude: 12.9 mag -Lightdrop: 1.6 - 2.0 mag -Max duration: 20.5 s -Event time: 00:31:37 UT -Error in time: 3 s -Moon distance: below horizon -Moon illumination: - Other comments: -Automatic observation, pre-pointing method -Target sky position: elevation = 40 deg, azimut = 133 deg -Tangra v. 3.6.15 was used to generate the lightcurve (aperture photometry, average background) -S/N of the target (before D and after R) about 5 -No correction at the times was applied accordingly to the so called "Dangl-correction" -A lightcurve can be seen here: http://sposetti.ch/wp-content/uploads/2018/04/2018_04_21_Elektra_Gnosca_Sposetti.png