ASTEROIDAL OCCULTATION - REPORT FORM +----------------------------------------+ +----------------------------------------------+ | EAON | | IOTA/ES | | | | INTERNATIONAL OCCULTATION | | EUROPEAN ASTEROIDAL | | TIMING ASSOCIATION | | OCCULTATION NETWORK | | EUROPEAN SECTION | +----------------------------------------+ +----------------------------------------------+ 1 DATE: 2021 April 2 STAR : UCAC4 403-052356 ASTEROID: (409) Aspasia 2 OBSERVER: Name: Gérard VAUDESCAL Abbr:VDC E-mail: gg.vaudescal@free.fr Address: 65380 Azereix - France 3 OBSERVING STATION: Nearest city: AZEREIX (65380) Station: Observatoire d'Azereix Latitude: N 43 12 36.0 (WGS84) Longitude: W 00 00 46.5 (WGS84) Altitude: 340 m Single, OR Double or Multiple station (Specify observer's name): Single +---------------------------------------------------+ 4 TIMING OF EVENTS: | | | OCCULTATION RECORDED: POSITIVE | | | +---------------------------------------------------+ Type of event Start observation Interrupt-start Disappearance Blink Flash End observation Jnterrupt-end Reappearance Other (specify) Event Time (UT) Acc. Comments Code HH MM SS.ss S.ss S - 21: 49: 01.41 on frame n°7 D - 21: 50: 14.05 +/- 0,17 " n°319 R - 21: 50: 32.75 +/- 0,12 " n°399 E - 21: 51: 39.63 on frame n°686 Duration : 18,70 sec +/- 0.21 Mid-event: 21: 50: 23.40 UT (Pédicted 21: 50: 21 +/- 3.2 sec) Was your reaction time applied to the above timings? NO 5 TELESCOPE: Type: Ritchey Chrétien RC10 - Aperture: 254 mm - Magnification: Focus 1340mm - F/D=5.27 Mount: Equatorial - Motor drive: YES 6 TIMING & RECORDING: Time source: GPS 1 PPS-NMEA Sensor: CAMERA ASI178MM - Binning x2 - Exposition :0,233sec/f => 4.29 fps Gamma na - Gain 398/510 Recording: Genika 10bits - format SER - Time insertion: module GPS_DCD_Time (Genika)-Synchronisation times UTC/frames with module SER Toolbox (Génika) Event insertion (specify): PC-Windows10 7 OBSERVING CONDITIONS: Clear SKY Wind: 0 ms Temperature: 12 °C Cloud : 50% (cloudy veil) Star image stability: seeing 1.1 arcsec Minor planet visible: Yes 8 ADDITIONAL COMMENTS: Reduction under TANGRA 3.7.3 Rev 20200512 Predicted Max Duration: 19.6sec Predicted Magnitude Drop: 0.53 mag No corrections applied / the test results show a variation of +/- 10ms whatever the exposure times between 20 and 700ms