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ASTEROIDAL 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: 12 Dec 2021
   STAR: UCAC4 571-038717
   ASTEROID: (16133) 1999 XC100

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 : 04:57:30
-D : 05:00:25.30 ± 0.05 s
-R : 05:00:27.05 ± 0.05 s
-E : 05:03:30

   Duration: 1.75 ± 0.10 s

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. 4.0.8395 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 = 100 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: 0.100 s
 
7. OBSERVING CONDITIONS
   
   -Atmospheric transparency: fair
   -Wind: no 
   -Star image stability: bad, turbulence
   -Minor Planet visible during the occultation: no

8. ADDITIONAL COMMENTS
   
   Prediction:
   -Occultwatcher, ITALOccult feed
   -Rank: 96
   -Probability: 48.2 %
   -Combined magnitude: 12.6 mag
   -Star magnitude: 12.6 mag V; 12.4 mag R
   -Asteroid magnitude: 17.5 mag
   -Lightdrop: 4.91 mag; 4.7 mag R
   -Max duration: 2.3 s
   -Event time: 05:00:20 UT
   -Error in time: 3 s
   -Moon distance: -
   -Moon illumination: -

   Other comments:
   -Target sky position: elevation = 40 deg, azimut = 263 deg
   -Tangra v. 3.7.3 was used to generate the lightcurve (aperture photometry, average background). Time reference: Start Frame 
   -AOTA v4.12.16.0 was used to calculate D and R times and uncertainties: SN at event locations: D = 4.2, R = 4.7, Ave = 4.4. Applied confidence level D: 90%, R: 90%
   -Measured lightdrop: signal dropped to zero
   -Measured mid-event time: 05:00:26.1 UT   
   -The lightcurve can be seen here:
http://sposetti.ch/wp-content/uploads/2021/12/2021_12_12_16133_Gnosca.png