+--------------------------------+ +--------------------------------+ ASTEROIDAL OCCULTATION - REPORT FORM +--------------------------------+ +--------------------------------+ EAON & IOTA-ES EUROPEAN ASTEROIDAL OCCULTATION NETWORK INTERNATIONAL OCCULTATION TIMING ASSOCIATION EUROPEAN SECTION +--------------------------------+ +--------------------------------+ 1. DATE: 30 Nov 2021 STAR: UCAC4 577-016317 ASTEROID: (1517) Beograd 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 : 19:47:30 -D : 19:50:30.66 ± 0.25 s -R : 19:50:34.16 ± 0.25 s -E : 19:53:30 Duration: 3.50 ± 0.50 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 = 50 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: 0.500 s 7. OBSERVING CONDITIONS -Atmospheric transparency: fair -Wind: no -Star image stability: fair/bad -Minor Planet visible during the occultation:- 8. ADDITIONAL COMMENTS Prediction: -Occultwatcher, IBEROC feed -Rank: 100 -Probability: 94.0 % -Combined magnitude: 13.8 mag -Star magnitude: 14.1 mag V; 13.9 mag R -Asteroid magnitude: 15.3 mag -Lightdrop: 1.3 mag R -Max duration: 3.3 s -Event time: 19:50:32 UT -Error in time: 3 s -Moon distance: - -Moon illumination: - Other comments: -Target sky position: elevation = 33 deg, azimut = 86 deg -Tangra v. 3.7.3 was used to generate the lightcurve (optimal ectraction photometry, average background). Time reference: Start Frame -AOTA v4.12.16.0 was used to calculate D and R times and uncertainties: SN at event locations: D = 6.9, R = 5.9, Ave = 6.4. Applied confidence level D: 90%, R: 90% -Measured lightdrop: 0.8 mag -Again many thanks to Eric Frappa for the help in evaluating the lightcurve with AOTA -Measured mid-event time: 19:50:32.4 UT -The lightcurve can be seen here: http://sposetti.ch/wp-content/uploads/2021/12/2021_11_30_Beograd_Gnosca.png