+--------------------------------+ +--------------------------------+ ASTEROIDAL OCCULTATION - REPORT FORM +--------------------------------+ +--------------------------------+ EAON & IOTA-ES EUROPEAN ASTEROIDAL OCCULTATION NETWORK INTERNATIONAL OCCULTATION TIMING ASSOCIATION EUROPEAN SECTION +--------------------------------+ +--------------------------------+ 1. DATE: 19 Oct 2021 STAR: UCAC4 626-002760 ASTEROID: (40432) 1999 RW29 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 -S1: 17:30:30 -E1: 17:32:13 -S2: 17:32:25 -D : 17:33:40.53 ± 0.02 s -R : 17:33:40.81 ± 0.01 s -E2: 17:36:30 Duration: 0.28 ± 0.03 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 = 20 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: 0.020 s 7. OBSERVING CONDITIONS -Atmospheric transparency: fair, clouds on target -Wind: no -Star image stability: fair/good -Minor Planet visible during the occultation: - 8. ADDITIONAL COMMENTS Prediction: -Occultwatcher, ITALOccult feed -Rank: 22 -Probability: 12.3 % -Combined magnitude: 9.2 mag -Star magnitude: 9.2 mag V; 9.1 mag R -Asteroid magnitude: 17.1 mag -Lightdrop: 7.9 mag; 7.6 mag R -Max duration: 0.9 s -Event time: 17:33:39 UT -Error in time: 4 s -Moon distance: 32 deg -Moon illumination: 99 % Other comments: -Target sky position: elevation = 35 deg, azimut = 73 deg -Tangra v. 3.7.3 was used to generate the lightcurve (aperture photometry, median background). Time reference: Start Frame -The target star in the FOV was barely visible from E1 to S2 because of clouds -During the event the starlight does not dropped to zero -Before and after the event the star's signal was saturated -Measured mid-event time: 17:33:40.67 UT -The lightcurve can be seen here: http://sposetti.ch/wp-content/uploads/2021/10/2021_10_19_1999RW29_Gnosca.png