+--------------------------------+ +--------------------------------+ ASTEROIDAL OCCULTATION - REPORT FORM +--------------------------------+ +--------------------------------+ EAON & IOTA-ES EUROPEAN ASTEROIDAL OCCULTATION NETWORK INTERNATIONAL OCCULTATION TIMING ASSOCIATION EUROPEAN SECTION +--------------------------------+ +--------------------------------+ 1. DATE: 19 Jun 2021 STAR: UCAC4 537-070312 ASTEROID: (105) Artemis 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 : 00:22:30 -D : 00:25:27.89 ± 0.10 s -R : 00:25:32.89 ± 0.12 s -E : 00:28:30 Duration: 5.00 ± 0.22 sec 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 = 40 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: 0.040 s 7. OBSERVING CONDITIONS -Atmospheric transparency: good -Wind: no -Star image stability: fair/good -Minor Planet visible during the occultation: yes 8. ADDITIONAL COMMENTS Prediction: -Occultwatcher, IOTA feed -Rank: 100 -Probability: 91.0 % -Combined magnitude: 11.1 mag -Star magnitude: 12.4 mag V -Asteroid magnitude: 11.5 mag -Lightdrop: 0.39 mag -Max duration: 17.9 s -Event time: 00:25:28 UT -Error in time: 4 s -Moon distance: 83 deg -Moon illumination: 59 % Other comments: -Target sky position: elevation = 60 deg, azimut = 198 deg -Tangra v. 3.7.3 was used to generate the lightcurve (aperture photometry, average background). Time reference: Start Frame -D and R times were evaluated using AOTA v4.10.5.0, applied confidence level: D = 90 %, R = 90 % -SN at event locations: D: 2.7; R: 2.5; Ave: 2.6 -Measured lightdrop: 0.27 mag -Measured mid-event time: 00:25:30.4 UT -The lightcurve can be seen here: http://sposetti.ch/wp-content/uploads/2021/06/2021_06_19_Artemis_Gnosca.png