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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: 08 Feb 2022
   STAR: UCAC4 638-016921
   COMET: 28P/Neujmin

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

3. OBSERVING STATION
   
   Nearest city: CH-6804 Monte Ceneri-Bironico
   Longitude (DD MM SS.s): 08 54 10.8 (E)
   Latitude (DD MM SS.s): 46 08 32.9 (N)
   Altitude: 540 m
   Google Earth (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 :  01:42:44
-D :  01:47:19.73 ± 0.32 s
-R :  01:47:21.49 ± 0.48 s
-E :  01:51:06

   Duration: 1.76 ± 0.80 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 = x32; 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: 0.640 s

7. OBSERVING CONDITIONS
   
   -Atmospheric transparency: good
   -Wind: light wind at the observing place 
   -Star image stability: bad
   -Comet visible during the occultation: no

8. ADDITIONAL COMMENTS
   
   Prediction:
   -Occultwatcher, COMETOCC feed
   -Rank: 25
   -Probability: 12.8 %
   -Combined magnitude: 11.9 mag
   -Star magnitude: 11.9 mag V; 11.0 mag R
   -Comet magnitude: 18.3 mag
   -Lightdrop: 6.4 mag; 6.8 mag R
   -Max duration: 3.5 s
   -Event time: 01:47:27 UT
   -Error in time: 10 s
   -Moon distance: -
   -Moon illumination: -

   Other comments:
   -Mobile station   
   -Target sky position: elevation = 15 deg, azimut = 309 deg
   -Tangra v. 3.7.3 was used to generate the lightcurve (aperture photometry, average background)
   -AOTA v. 4.12.16.0 was used to calculate D and R times and uncertainties
   -Camera delays have been applied by AOTA to the times
   -Eric Frappa checked and refined the analysis
   -Event lasted more than 2 integration frames and was visually evident on the laptop screen
   -Some minutes before I tried to half the integration time but the quality of the target dimished, so I kept the signal at a "safety" level
   -Measured lightdrop: -
   -Measured mid-event time: 01:47:20.6 UT
   -The lightcurve can be seen here:
http://sposetti.ch/wp-content/uploads/2022/02/2022_02_08_28P-Neujmin_Monte-Ceneri.png