+--------------------------------+ +--------------------------------+ ASTEROIDAL OCCULTATION - REPORT FORM +--------------------------------+ +--------------------------------+ EAON & IOTA-ES EUROPEAN ASTEROIDAL OCCULTATION NETWORK INTERNATIONAL OCCULTATION TIMING ASSOCIATION EUROPEAN SECTION +--------------------------------+ +--------------------------------+ 1. DATE: 07 Mar 2022 STAR: UCAC4 485-044691 ASTEROID: (572) Rebekka 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 : 20:21:00 -D : 20:24:11.52 ± 0.13 s -R : 20:24:15.02 ± 0.13 s -E : 20:27:00 Duration: 3.50 ± 0.25 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. 4.0.8395 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 = 36, banding threshold = 40, apply flat = none, subtract dark = none -Timekeeping: GPS UTC clock -Integration time: 0.250 s 7. OBSERVING CONDITIONS -Atmospheric transparency: fair, some moonlight -Wind: no -Star image stability: good -Minor Planet visible during the occultation: yes 8. ADDITIONAL COMMENTS Prediction: -Occultwatcher, ITALOccult feed -Rank: 86 -Probability: 59.1 % -Combined magnitude: 13.6 mag -Star magnitude: 14.0 mag V; 13.9 mag R -Asteroid magnitude: 14.9 mag -Lightdrop: 1.3 mag; 1.1 mag R -Max duration: 4.4 s -Event time: 20:24:15 UT -Error in time: 3 s -Moon distance: 75 deg -Moon illumination: 26 % Other comments: -Target sky position: elevation = 51 deg, azimut = 175 deg -Tangra v. 3.7.3 was used to generate the lightcurve (aperture photometry, average background). Time reference: Start Frame -AOTA v4.12.16.0 was used to calculate D and R times and uncertainties -Measured lightdrop: 1.3 mag -Eric Frappa checked the results -Measured mid-event time: 20:24:13.3 UT -The lightcurve can be seen here: http://sposetti.ch/wp-content/uploads/2022/03/2022_03_07_Rebekka_Gnosca.png