+--------------------------------+ +--------------------------------+ ASTEROIDAL OCCULTATION - REPORT FORM +--------------------------------+ +--------------------------------+ EAON & IOTA-ES EUROPEAN ASTEROIDAL OCCULTATION NETWORK INTERNATIONAL OCCULTATION TIMING ASSOCIATION EUROPEAN SECTION +--------------------------------+ +--------------------------------+ 1. DATE: 23 Nov 2022 STAR: UCAC4 577-024884 ASTEROID: (121) Hermione 2. OBSERVER Name: Stefano SPOSETTI Address: 6525 GNOSCA - Switzerland Email: stefanosposetti@ticino.com 3. OBSERVING STATION Nearest city: CH-6525 Gnosca Station: 143 (MPC-code) 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 - 03:11:05 D - 03:14:14.38 ± 0.015 sec R - 03:14:27.54 ± 0.010 sec E - 03:17:05 Duration : 13.16 ± 0.018 sec 5. TELESCOPE -Type: Newton -Aperture: 420 mm -Focal length: 1640 mm -Mount: Equatorial -Motor drive: yes 6. TIMING & RECORDING -Camera/Sensor: Videocamera QHY174M-GPS, SONY IMX174 CMOS sensor -Device of recording: personal computer, USB3 input, SharpCap PRO v. 4.0.9268.0 software, saved on SSD as ADV file -binning = 2x2, sensor cooled, sensor temperature = -20 °C, camera bit depth = MONO16, area size in pixel = 960x600, USB traffic = 5, setted exposure = 200 ms, gain = 480, offset = 0, contrast = 0, brightness = 0, gamma = 1, banding suppression = 67, banding threshold = 40, apply flat = none, subtract dark = none -Timekeeping: GPS UTC clock -Integration time: 0.200 s 7. OBSERVING CONDITIONS -Atmospheric transparency: good -Wind: no -Star image stability: fair/good -Minor Planet visible during the occultation: yes 8. ADDITIONAL COMMENTS Prediction: -Occultwatcher, NALowMag -Rank: 100 -Probability: 91.3 % -Combined magnitude: 12.1 - 12.6 mag -Star magnitude: 14.0 mag V; 13.8 mag R -Asteroid magnitude: 12.6 mag -Lightdrop: 0.26 mag; 0.2 mag R -Max duration: 20.8 s -Event time: 03:14:13 UT -Error in time: 5 s -Moon distance: - -Moon illumination: - -https://cloud.occultwatcher.net/event/691-121-87736-649589-U024884 -Orbit Date: 21 Sep 2022 (JPL#126) Other comments: -Target sky position: elevation = 60 deg, azimut = 234 deg -Tangra v. 3.7.4 was used to generate the lightcurve (aperture photometry, median background). Time reference: Start Frame -Measured lightdrop: 0.3 mag -Many thanks to Eric Frappa who checked and refined the analysis -The lightcurve can be seen here: https://sposetti.ch/wp-content/uploads/2022/11/2022_11_23_Hermione_Gnosca.png