#IOTA-ES ASTEROIDAL OCCULTATION - REPORT FORM 2.03 - DVTI+CAM TEMPLATE 1.6 #Event #Occultation: POSITIVE #DATE: 20 Feb 2025, 18:40:50 #PREDICTTIME: 20 Feb 2025, 18:40:50 #STAR: UCAC4 502-050474 #ASTEROID: Thessandrus #Nr: 4902 #OBSERVER #Observer1: Stefan Meister #Observer2: #moreObs: #E-mail: meister@dolphins.ch #Address: Sandgruebstr. 9, CH-8193 Eglisau, Switzerland #OBSERVING_STATION #NearestCity: Buelach #Countrycode: CH #Coordinates LAT +/-DD MM SS.S LON +/-DDD MM SS.S #Latitude: +47 31 10.402 #Longitude: +008 34 14.300 #Altitude: 550 #Datum _blank=WGS84 N=NAD1927 E=ED1950 T=Tokyo G=GB1936 *=unspecified, or other #Datum: #Teleskop _=unstated 1=Refractor 2=Newtonian 3=SCT 4=Dobsonian 5=Binoculars 6=Other 7=None 8=eVscope #Telescope: 2 #Aperture in cm #Aperture: 50.0 #FocalLength in cm #FocalLength: 250.0 #ObservingMethod _=unspecified a=Analogue & digital video b=Digital SLR-camera video c=Photometer d=Sequential images e=Drift scan f=Visual g=Other #ObservingMethod: a #Observation #StartObs: 18:40:20.731 #D D=Main Star d=second Star G=satellite main star g=satellite 2nd star N=ring M=non detection +time hh:mm:ss.s #D: D18:40:50.731 #Acc_D: 0.098 #R R=Main Star r=second Star B=satellite main star b=satellite 2nd star N=ring M=non detection +time hh:mm:ss.s #R: R18:40:53.531 #Acc_R: 0.098 #EndObs: 18:41:29.931 #Duration: 2.800 #Exp_Time: 0.200 #Timesource _=unspecified a=GPS b=NTP c=Telephone (fixed or mobile) d=Radio time signal e=Internal clock of recorder f=Stopwatch g=Other #Timesource: a #Camera: DVTI+CAM, serial #17 #Signal/Noise: 4.6 #Weatherconditions #Wind: #Temperature: #Transparency 1=Clear 2=Fog 3=Thin cloud <2 [mag loss <2 mag.] 4=Thick cloud >2 [mag loss >2 mag. 5=Broken opaque cloud [that is, observed thru gaps in the cloud] 6=Star faint 7=By averted vision #Transparency: 3 #Stability _=unstated 1=Steady 2=Slight flickering 3=Strong flickering #Stability: 2 #Comments: # #EXTRA_FIELDS #Feed: Planned Observations #MpcObsCode: - #Prediction: yes #ProbabilityPercent: 55.9 #PredictedDurationSec: 3.4 #DistanceCentralLineKm: 26.0 #PathWidthKm: #StarMag: 14.6 #StarAltDeg: 28 #StarAzDeg: 106 #StarConstellation: Cancer #AsteroidMag: 16.8 #AsteroidDiameterKm: 55.0 #CombinedMag: 14.5 #DeltaMag: 2.3 #Moon: below horizon #TelescopeType: Newtonian #MountModel: equatorial #MountMotorDrive: yes #StartObsAccSec: 0.001 #EndObsAccSec: 0.001 #FieldOfView: #CameraGainDb: +24 dB #CameraBinning: 2x2 #CameraWidthHeight: 816x620 #CameraRecordingFormat: ADV 16-bit #ImageSensor: Sony IMX430LLJ-C (9.2mm 1624x1240 4.5um CIS) #TimeSource: Max M8C GNSS module in the camera #TimeInserter: - #FrameGrabber: - #RecordingSoftware: DVTI Cam Control v5.9.0-61 #LightcurveExtractionSoftware: #LightcurveAnalysisSoftware: #ErrorInTime: +/- 2.224 s #StarMagnitudeInV: #StarMagnitudeInR: #MaxDuration: 3.4 s #MagnitudeDrop: 2.3 #MagnitudeDropInR: #EventRank: #Probability: 55.9 ASTEROIDAL OCCULTATION - REPORT FORM +------------------------------+ +-------------------------------+ | EAON | | IOTA/ES | | | | INTERNATIONAL OCCULTATION | | EUROPEAN ASTEROIDAL | | TIMING ASSOCIATION | | OCCULTATION NETWORK | | EUROPEAN SECTION | +------------------------------+ +-------------------------------+ 1 DATE: 2025 Feb 20, 18:40 (UTC) STAR: UCAC4 502-050474 mv: 14.6 mag ASTEROID: (4902) Thessandrus mv: 16.8 mag (diam. 55.0 km) combined magnitude: mv: 14.5 mag delta-magnitude: mv: 2.3 mag 2 OBSERVER: Name: Stefan Meister E-mail: meister@dolphins.ch Address: Sandgruebstr. 9, CH-8193 Eglisau, Switzerland 3 OBSERVING STATION: Nearest city: Buelach, CH Station: Observatory Buelach (MPC Obs. Code: 167) Latitude: N47 31' 10.402" (WGS84) Longitude: E008 34' 14.300" (WGS84) Altitude: 550 m (MSL) (WGS84) Single station: yes Predicted observation: yes (Distance 26.0 km from C.L.) Probability: 55.9 percent +----------------------------------+ 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 18 40 20.731 +/- 0.001 s : Start observation (UTC) E 18 41 29.931 +/- 0.001 s : End observation (UTC) P 18 40 50.077 +/- 2.224 s : Predicted time (UTC) (predicted: max. 3.4 s) In case of a positive event: see extracted times in the PyOTE report "LC.pyote_log.txt". 5 TELESCOPE: Type: Newtonian Aperture: 500 mm Focal length: 2500 mm Magnification: focal (resulting field of view: 11.9' in x-axis for IMX430) Mount: equatorial Motor drive: yes 6 TIMING & RECORDING: Time source: GPS Quality of signal: Accuracy 6 m Camera/Sensor: Digital Camera with integrated GPS-VTI (DVTI+CAM, serial #17) Image Sensor Sony IMX430LLJ-C (9.2mm 1624x1240 4.5um CIS) Website of the project: https://groups.io/g/d-vti-cam/ Settings: 816x620, Exposure time 200.0 ms, Gain +24 dB, Binning 2x2, Format ADV 16-bit Time insertion: Digital GNSS timestamp into image sensor data stream 7 OBSERVING CONDITIONS: Moon: below horizon Wind: Bft Temperature: deg C Transparency: 3 Star image stability: 2 Altitude of star: 28 deg Azimut of star: 106 deg in Cancer StarConstellation: Cancer 8 ADDITIONAL COMMENTS: Feed: Planned Observations Video recording software: DVTI Cam Control v5.9.0-61 Signal/Noise: 4.6 Further Comments: