+--------------------------------+ +--------------------------------+ ASTEROIDAL OCCULTATION - REPORT FORM +--------------------------------+ +--------------------------------+ EAON & IOTA-ES EUROPEAN ASTEROIDAL OCCULTATION NETWORK INTERNATIONAL OCCULTATION TIMING ASSOCIATION EUROPEAN SECTION +--------------------------------+ +--------------------------------+ 1. DATE: 27 Jul 2020 STAR: TYC 0010-01080-1 ASTEROID: (91) Aegina 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 : 02:45:45 -D : 02:48:12.43 ± 0.03 s -R : 02:48:37.02 ± 0.04 s -E : 02:51:45 Duration: 24.59 s ± 0.07 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, pixel image size = 960x600, USB traffic = 5, setted exposure = 50 ms, gain = 480, offset = 0, contrast = 0, brightness = 0, gamma = 1, banding suppression = 39, banding threshold = 35, apply flat = none, subtract dark = none -Timekeeping: GPS UTC clock -Integration time: 0.050 s 7. OBSERVING CONDITIONS -Atmospheric transparency: good -Wind: none -Star image stability: good -Minor Planet visible during the occultation: barely 8. ADDITIONAL COMMENTS Prediction: -Occultwatcher, IOTA feed -Rank: 100 -Probability: 99.9 % -Combined magnitude: 12.0 mag -Star magnitude: 12.3 mag V -Asteroid magnitude: 13.4 mag -Lightdrop: 1.44 mag -Max duration: 22.9 s -Event time: 02:48:44 UT -Error in time: 6 s -Moon distance: - -Moon illumination: - Other comments: -Target sky position: elevation = 45 deg, azimut = 162 deg -Tangra v. 3.7.3 was used to generate the lightcurve (aperture photometry, average background) -D and R times were evaluated using AOTA v4.10.5.0 -Measured mid-event UT time: 02:48:24.72 -Measured lightdrop: 1.2 mag -Pre and post event SNR: ~ 8 -A lightcurve can be seen here: http://sposetti.ch/wp-content/uploads/2020/08/2020_07_27_Aegina_Gnosca_Locarno.png