+--------------------------------+ +--------------------------------+ ASTEROIDAL OCCULTATION - REPORT FORM +--------------------------------+ +--------------------------------+ EAON & IOTA-ES EUROPEAN ASTEROIDAL OCCULTATION NETWORK INTERNATIONAL OCCULTATION TIMING ASSOCIATION EUROPEAN SECTION +--------------------------------+ +--------------------------------+ 1. DATE: 10 Jan 2022 STAR: UCAC4 581-040294 ASTEROID: (2808) Belgrano 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 : 21:06:00 -D : 21:08:53.42 ± 0.15 s -R : 21:08:55.22 ± 0.15 s -E : 21:12:00 Duration: 1.80 ± 0.3 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 = 300 ms, gain = 480, offset = 0, contrast = 0, brightness = 0, gamma = 1, banding suppression = 60, banding threshold = 40, apply flat = none, subtract dark = none -Timekeeping: GPS UTC clock -Integration time: 0.300 s 7. OBSERVING CONDITIONS -Atmospheric transparency: good -Wind: no -Star image stability: fair/bad -Minor Planet visible during the occultation: yes 8. ADDITIONAL COMMENTS Prediction: -Occultwatcher, IBEROC feed -Rank: 66 -Probability: 39.0 % -Combined magnitude: 13.9 mag -Star magnitude: 14.2 mag V; 14.0 mag R -Asteroid magnitude: 15.3 mag -Lightdrop: 1.44 mag; 1.2 mag R -Max duration: 1.2 s -Event time: 21:08:54 UT -Error in time: 3 s -Moon distance: 82 deg -Moon illumination: 61 % Other comments: -Target sky position: elevation = 51 deg, azimut = 106 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. Eric Frappa checked and corrected the results. -Measured lightdrop: ~ 1.2 mag -Measured mid-event time: 21:08:54.3 UT -The lightcurve can be seen here: http://sposetti.ch/wp-content/uploads/2022/01/2022_01_10_Belgrano_Gnosca.png