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ASTERIODAL OCCULTATION - REPORT FORM

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EAON & IOTA-ES

EUROPEAN ASTEROIDAL OCCULTATION NETWORK

INTERNATIONAL OCCULTATION TIMING ASSOCIATION EUROPEAN SECTION

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1. DATE: 24 Dec 2018
   STAR: UCAC4 534-010144
   ASTEROID: (145451) 2005 RM43

2. OBSERVER
   
   Name: Stefano SPOSETTI
   Address: 6525 GNOSCA - Switzerland
   Email: stefanosposetti@ticino.com

3. OBSERVING STATION
   
   Nearest city: CH-6525 Gnosca
   Station: 143
   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 : 02:15:00
-D : 02:20:46.80 ± 0.64 s
-R : 02:21:06.00 ± 0.64 s
-E : 02:25:29

   Duration: 19.2 s ± 1.28 s
   
   Mid-time event: 02:20:56.40

5. TELESCOPE
   
   -Type: Schmidt-Cassegrain, Celestron 11-inch
   -Aperture: 280 mm
   -Focal length: 930 mm (with focal reducer)
   -Magnification: FOV 23x18 arcmin
   -Mount: Equatorial
   -Motor drive: Yes

6. TIMING & RECORDING
   
   -Camera/Sensor: Videocamera WAT-910HX-RC, CCIR, 1/2"
   -Videocamera settings: Shutter = x64, Gain = 25/41, Gamma = 1.00
   -Device of recording: Personal computer
   -Grabber: Imaging Source DFG/SV1 PCI, composite input
   -Software: Virtualdub v. 1.10.4, saved on Harddisk as Lagarith compressed file
   
   -Time insertion device: IOTA-VTI, v.1.1.42
   -Timekeeping: GPS 1PPS (US Global Sat EM-406A)
   -Integration time: 1.280 s
  
7. OBSERVING CONDITIONS
   
   -Atmospheric transparency: poor (high clouds passing, sky illuminated by the Moon)
   -Wind: none in the observatory
   -Star image stability: bad
   -Minor Planet visible during the occultation: -

8. ADDITIONAL COMMENTS
   
   Prediction:
   -Occultwatcher, RIO-TNO feed
   -Rank: 13
   -Probability: 4.8 %
   -Combined magnitude: 13.5 mag
   -Star magnitude: 13.5 magV; 10.0 magR
   -Asteroid magnitude: 20.1 mag
   -Lightdrop: 6.6 mag; 9.7 magR
   -Max duration: 20.2 s
   -Event time: 02:20:47 UT
   -Error in time: 1.7 min
   -Moon distance: 37 deg
   -Moon illumination: 97 %

   Other comments:
   -Target sky position: elevation = 30 deg, azimut = 262 deg.
   -Tangra v. 3.6.18 was used to generate the lightcurve (optimal extraction photometry, average background).
   -A correction of - 0.660 s was applied because of the use of an integration camera (so called "Dangl-correction").
   -Measured lightdrop: no.
   -No biases, darks and flats were made. That was an error caused by the visually deception that the event was unmeasurable because of the incoming worsening of the sky transparency.
   -Copy of the recorded avi sent to F.B.Rivas.