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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: 02 Feb 2020
   STAR: UCAC4 481-021366
   ASTEROID: (238) Hypatia

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

3. OBSERVING STATION
   Nearest city: CH-6517 Arbedo-Castione
   Station: mobile
   Longitude (DD MM SS.s): 09.0524 (E)
   Latitude (DD MM SS.s): 46.2214 (N)
   Altitude: 210 m
   (Google Earth)

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 : 01:19:00
-D : 01:20:08.11 ± 0.32 s
-R : 01:20:22.19 ± 0.32 s
-E : 01:21:56

   Duration: 14.08 s ± 0.64 s

5. TELESCOPE
   Type: Schmidt-Cassegrain, Celestron 8-inch
   Aperture: 200 mm
   Focal length: about 900 mm (with focal reducer)
   Magnification: -
   Mount: Equatorial
   Motor drive: Yes

6. TIMING & RECORDING
   -Camera/Sensor: Videocamera WAT-910HX-RC, CCIR, 1/2", ICX429ALL sensor
   -Videocamera settings: Shutter = x16; Gain = 41/41; Gamma = 1.00
   -Device of recording: Personal computer
   -Videograbber: Logilink USB Grabber VG0001, 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: 0.320 s

7. OBSERVING CONDITIONS
   -Atmospheric transparency: good
   -Wind: none 
   -Star image stability: bad, air turbulence
   -Minor Planet visible during the occultation: yes

8. ADDITIONAL COMMENTS
   Prediction:
   -Occultwatcher, UKOCL feed 
   -Event time: 02 Feb 2020, 01:20:22 UT
   -Rank: 100
   -Probability: 93.2 %
   -Event time: 21:07:08 UT
   -Lightdrop: 0.66 mag; 0.9 mag R
   -Combined magnitude: 11.9 mag
   -Asteroid magnitude: 12.6 mag
   -Star magnitude: 12.8 mag V; 11.9 mag R
   -Max duration: 17.3 s
   -Error in time: 3 s
   -Moon distance: -
   -Moon illumination: -
 
   Other comments:
   -Target sky position: elevation = 23 deg, azimut = 254 deg
   -Tangra v. 3.6.21 was used to generate the lightcurve (aperture photometry, average background)
   -Because of the not clear lightcurve, the error bars were multiplied by a factor 2
   -Signal dropped from ~ 1750 ADU to ~ 950 ADU
   -Measured mid-event UT time: 01:20:15.15 ± 0.32 s
   -A correction of - 0.180 s was applied because of the use of an integration camera (so called "Dangl-correction")
   -A lightcurve can be seen here:
http://sposetti.ch/wp-content/uploads/2020/02/2020_02_02_Hypatia_Arbedo.png