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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: 27 Jan 2022
   STAR: HIP 32194
   ASTEROID: (138) Tolosa

2. OBSERVERS
   
   Name: S. SPOSETTI, B. BONGULIELMI, P. DANIELLI, A. DEMENGA, C. PONTINELLI
   Address: 6525 GNOSCA - Switzerland
   Email: stefanosposetti@ticino.com


3. OBSERVING STATION
   
   Nearest city: CH-6850 Mendrisio
   Longitude (DD MM SS.s): 08 58 41.4 (E)
   Latitude (DD MM SS.s): 45 51 47.0 (N)
   Altitude: 345 m
   (WGS84) 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 : 17:59:30
-D : 18:00 07.34 ± 0.04 s
-R : 18:00:10.70 ± 0.04 s
-E : 18:00:35

   Duration: 3.36 ± 0.08 s

5. TELESCOPE

   Type: Schmidt-Cassegrain, Celestron 8-inch
   Aperture: 200 mm
   Focal length: ~ 500 mm (with double 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 = 1/50 s; 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 Huffyuv compressed file
   -Time insertion device: IOTA-VTI, v.1.1.42
   -Timekeeping: GPS 1PPS (US Global Sat EM-406A)
   -Integration time: 0.040 s

7. OBSERVING CONDITIONS
   
   -Atmospheric transparency: fair
   -Wind: no 
   -Star image stability: fair/good
   -Minor Planet visible during the occultation: no

8. ADDITIONAL COMMENTS
   
   Prediction:
   -Occultwatcher, IOTA feed
   -Rank: 100
   -Probability: 100.0 %
   -Combined magnitude: 8.8 mag
   -Star magnitude: 8.8 mag V
   -Asteroid magnitude: 13.0 mag
   -Lightdrop: 4.22 mag
   -Max duration: 4.9 s
   -Event time: 18:00:08 UT
   -Error in time: 2 s
   -Moon distance: -
   -Moon illumination: -

   Other comments:
   -Target sky position: elevation = 42 deg, azimut = 93 deg
   -Tangra v. 3.7.3 was used to generate the lightcurve (aperture photometry, average background)
   -The so-called "Dangl correction" was applied
   -AOTA v4.12.16.0 was used to calculate D and R times and uncertainties. Eric Frappa checked the results
   -Measured lightdrop: -
   -Measured mid-event time: 18:00:09.0 UT   
   -The lightcurve can be seen here:
http://sposetti.ch/wp-content/uploads/2022/01/2022_01_27_Tolosa_Mendrisio.png