ASTEROIDAL OCCULTATION - REPORT FORM +------------------------------+ +-------------------------------+ | EAON | | IOTA/ES | | | | INTERNATIONAL OCCULTATION | | EUROPEAN ASTEROIDAL | | TIMING ASSOCIATION | | OCCULTATION NETWORK | | EUROPEAN SECTION | +------------------------------+ +-------------------------------+ 1 DATE: 2020 May 17, 20:29 (UTC) STAR: UCAC4 401-052016 mv: 14.5 mag ASTEROID: (95) Arethusa mv: 13.8 mag (diam. 148.0 km) combined magnitude: mv: 13.3 mag delta-magnitude: mv: 0.5 mag 2 OBSERVER: Name: Andreas SCHWEIZER E-mail: aschweiz@mac.com Address: Strumbergaecherstr. 3A, 8907 Wettswil, Switzerland 3 OBSERVING STATION: Nearest city: Buelach, Switzerland Station: Observatory Buelach (MPC Observatory Code: 167) http://www.sternwartebuelach.ch/ Latitude: N 47 31 10.4 (WGS84) Longitude: E 08 34 14.3 (WGS84) Altitude: 550 m (MSL) (WGS84) Predicted observation: yes (located INSIDE of predicted shadow path, 13km E of C.L.) Probability: 74 percent Single station: Andreas SCHWEIZER +----------------------------------+ 4 TIMING OF EVENT: | | | OCCULTATION RECORDED: POSITIVE | | | +----------------------------------+ Type of event: S = Start observation I = Interrupt-start D = Disappearance B = Blink F = Flash E = End observation I = Interrupt-end R = Reappearance M = Mid-event P = Predicted time Event Time (UTC) Acc. Comments Code HH MM SS.sss S.sss S 20 28 12.036 +/- 0.001 s : Start observation (UTC) D 20 29 54.060 +/- 0.100 s : Disappearance (UTC) R 20 30 08.710 +/- 0.350 s : Reappearance (UTC) E 20 31 38.283 +/- 0.001 s : End observation (UTC) Duration: 14.650 +/- 0.450 s : (predicted: max. 21.4s) P 20 29 57 +/- 9 s : Predicted time (UTC) 5 TELESCOPE: Type: Newton Reflector f/5 Aperture: 500 mm Focal length: 2500 mm Magnification: focal (resulting field of view: 15.5' in x-axis) Mount: equatorial Motor drive: yes 6 TIMING & RECORDING: Time source: GPS Quality of signal: Accuracy 7m Camera/Sensor: Digital Camera with integrated GPS-VTI (Prototype v2b, #7) IMX174LLJ, Pixel size 5.86my, QE ~77% @ 530nm Website of the project: https://groups.io/g/d-vti-cam/ Settings: 960x600, 2x2 Binning, Exposure time 200ms (5 fps), Gain +16dB, Format ADV 16 Bit Time insertion: - within Camera, visual and digital GPS timestamp (highly accurate) - Backup with NTP synced PC timestamp (not accurate, just used for comparison purposes) 7 OBSERVING CONDITIONS: Atmospheric transp.: good Moon: below horizon Wind: none Star image stability: good Altitude of star: 30 deg Azimut of star: 201 deg in Crater 8 ADDITIONAL COMMENTS: Feed: OWEvents, Antoni Selva Video recording software: DvtiCamControl v4.9.10 Light measurement tool: Tangra v3.7.3 Remarks: Observed by Stefan MEISTER at the same location with the Ritchey-Chrétien telescope (see separate report by Stefan) R time updated with information from Eric Frappa Published by e-mail to planoccult@ls.vvs.be (Planoccult mailing list)