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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: 22 Jun 2020
   STAR: UCAC4 561-089839
   ASTEROID: (2) Pallas

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 : 23:05:00
-D : 23:08:41.18 ± 0.20 s
-R : 23:09:08.97 ± 0.22 s
-E : 23:13:00

   Duration: 27.79 s ± 0.42 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. 3.2.6173.0 software, saved on SSD as SER file
   -binning = 1x1, sensor uncooled, camera bit depth = MONO16, pixel image size = 960 x 600, USB Traffic = 5, setted exposure = 40 ms, Gain = 480, Offset = 304, Contrast = 0, Brightness = 0, Gamma = 1, Banding suppression = 50, Banding Threshold = 40
   -Timekeeping: GPS UTC clock
   -Integration time: 0.040 s
 
7. OBSERVING CONDITIONS
   
   -Atmospheric transparency: good
   -Wind: none 
   -Star image stability: fair
   -Minor Planet visible during the occultation: yes

8. ADDITIONAL COMMENTS
   
   Prediction:
   -Occultwatcher, IOTA feed
   -Rank: 100
   -Probability: 100.0 %
   -Combined magnitude: 9.43 mag
   -Star magnitude: 11.5 mag V
   -Asteroid magnitude: 9.6 mag
   -Lightdrop: 0.17 mag
   -Max duration: 41.8 s
   -Event time: 23:08:57 UT
   -Error in time: 2 s
   -Moon distance: -
   -Moon illumination: -

   Other comments:
   -Target sky position: elevation = 59 deg, azimut = 132 deg
   -Tangra v. 3.7.3 was used to generate the lightcurve (aperture photometry, average background)
   -AOTA v. 4.10.5.0 was used to find D and R times and their uncertainties
   -Measured mid-event UT time = 23:08:55.08
   -The visual inspection of the lightcurve shows that the D event seems quite evident, while the R is more difficult to see
   -A lightcurve can be seen here:
http://sposetti.ch/wp-content/uploads/2020/06/2020_06_22_Pallas_Gnosca.png