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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: 05 Sep 2021
   STAR: 2UCAC 40488211
   ASTEROID: (22) Kalliope #1

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

3. OBSERVING STATION
   
   Nearest city: I- 09010 Fluminimaggiore
   Longitude (DD MM SS.s): 08 25 56.4 (E)
   Latitude (DD MM SS.s): 39 27 07.9 (N)
   Altitude: 80 m
   (GoogleEarth)

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 - 02:30:34
D - 02:31:24.22 ± 0.17 sec
R - 02:31:28.06 ± 0.17 sec
E - 02:31:55

   Duration: 3.84 ± 0.22 sec 

5. TELESCOPE

   Type: Schmidt-Cassegrain, Celestron 8-inch
   Aperture: 200 mm
   Focal length: ~ 900 mm (with focal reducer)
   Magnification: -
   Mount: Equatorial
   Motor drive: No

6. TIMING & RECORDING

   -Camera/Sensor: Videocamera WAT-910HX-RC, CCIR, 1/2", ICX429ALL sensor
   -Videocamera settings: Shutter = x8; 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: 0.160 s

7. OBSERVING CONDITIONS
   
   -Atmospheric transparency: good
   -Wind: fair 
   -Star image stability: fair
   -Minor Planet visible during the occultation: yes

8. ADDITIONAL COMMENTS
   
   Prediction:
   -Occultwatcher, IOTA feed
   -Rank: 100
   -Probability: 99.8 %
   -Combined magnitude: 11.2 mag
   -Star magnitude: 12.1 mag V
   -Asteroid magnitude: 11.9 mag
   -Lightdrop: 0.66
   -Max duration: 6.5 s
   -Event time: 02:31:28 UT
   -Error in time: 2 s
   -Moon distance: 47 deg
   -Moon illumination: 5 %

   Other comments:
   -Target sky position: elevation = 36 deg, azimut = 86 deg
   -Tangra v. 3.7.3 was used to generate the lightcurve (aperture photometry, average background)
   -D and R times were evaluated with PyOTE with the help of Eric Frappa
   -Measured mid-event time: 02:31:26.1 UT   
   -The lightcurve can be seen here:
http://sposetti.ch/wp-content/uploads/2021/10/2021_09_05_Kalliope_Fluminimaggiore.png