+--------------------------------+ +--------------------------------+ ASTEROIDAL OCCULTATION - REPORT FORM +--------------------------------+ +--------------------------------+ EAON & IOTA-ES EUROPEAN ASTEROIDAL OCCULTATION NETWORK INTERNATIONAL OCCULTATION TIMING ASSOCIATION EUROPEAN SECTION +--------------------------------+ +--------------------------------+ 1. DATE: 07 Aug 2021 STAR: UCAC4 527-015350 ASTEROID: (2147) Kharadze 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: UNCERTAIN 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 : 02:57:00 -D : 02:59:51.11 ± 0.10 s -R : 02:59:51.31 ± 0.10 s -E : 03:03:00 Duration: 0.20 ± 0.20 s 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. 3.2.6173.0 software, saved on SSD as SER file -binning = 2x2, sensor uncooled, 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 = 0, banding threshold = 35, 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: good -Minor Planet visible during the occultation: - 8. ADDITIONAL COMMENTS Prediction: -Occultwatcher, IBEROC feed -Rank: 100 -Probability: 96.6 % -Combined magnitude: 12.9 mag -Star magnitude: 12.9 mag V; 12.7 mag R -Asteroid magnitude: 18.1 mag -Lightdrop: 5.1 mag; 4.9 mag R -Max duration: 0.7 s -Event time: 02:59:51 UT -Error in time: 1 s -Moon distance: 34 -Moon illumination: 2 % Other comments: -Target sky position: elevation = 20 deg, azimut = 88 deg -Tangra v. 3.7.3 was used to generate the lightcurve (aperture photometry, average background). Time reference: Start Frame -The luminosity dropped to zero during one integration frame -The lightcurve can be seen here: http://sposetti.ch/wp-content/uploads/2021/08/2021_08_07_-Kharadze_Gnosca.png