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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: 22 Nov 2022
   STAR: UCAC4 612-008956
   ASTEROID: (4744) Rovereto

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

3. OBSERVING STATION
   Nearest city: CH-6525 Gnosca
   Longitude: 9d 1m 26.5s (E)
   Latitude: 46d 13m 53.2s (N)
   Altitude: 260 m
   (WGS84)

4. TIMING OF EVENTS
   Occultation recorded: UNCERTAIN
   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 : 20:17:36
-D : 20:20:18.5 ± 0.2 sec
-R : 20:20:20.1 ± 0.4 sec
-E : 20:23:36

   Duration: 1.6 ± 0.45 sec

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 ADV file
   -binning = 2x2, cooled sensor at temperature -20 deg C, camera bit depth = MONO16, area size in pixel = 960x600, USB traffic = 5, setted exposure = 400 ms, gain = 480, offset = 0, contrast = 0, brightness = 0, gamma = 1, banding suppression = 67, banding threshold = 40, apply flat = none, subtract dark = none
   -Timekeeping: GPS UTC clock
   -Integration time: 0.400 s

7. OBSERVING CONDITIONS
   -Atmospheric transparency: good
   -Wind: -
   -Star image stability: bad (turbulence)
   -Minor Planet Visible: -

8. ADDITIONAL COMMENTS
   
   Prediction:
   -Occultwatcher, IBEROC feed
   -Rank: 100
   -Probability: 84.9 %
   -Combined magnitude: 14.3 mag
   -Star magnitude: 14.5 mag V; 14.2 mag R
   -Asteroid magnitude: 16.4 mag
   -Lightdrop: 2.07 mag; 2.0 mag R
   -Max duration: 1.4 s
   -Event time: 20:20:18 UT
   -Error in time: 3 s
   -Moon distance: -
   -Moon illumination: -
   -https://cloud.occultwatcher.net/event/690-4744-45019-650039-U008956

   Other comments:
   -Target sky position: elevation = 61 deg, azimut = 107 deg
   -Tangra v. 3.7.3 was used to generate the lightcurve (Optimal Extraction photometry, aperture 6 pixel, LP filter, median background). Time reference: Start Frame
   -Measured lightdrop: ~ 0.6 mag
   -AOTA was used to extract D and R times
   -A false positive test made with PyOTE failed
   -I wish to thank Eric Frappa who performed a more refined analysis of the lightcurve
   -A lightcurve can be seen here:
https://sposetti.ch/wp-content/uploads/2022/11/2022_11_22_Rovereto_Gnosca.png