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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: 13 Oct 2017
   STAR: 4UC 525-008744
   ASTEROID: (335) Roberta

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

3. OBSERVING STATION
   Nearest city: CH-6525 Gnosca
   Longitude: 9d 1m 26.5s (E)
   Latitude: 46d 13m 53.2s (N)
   Altitude: 260m
   (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 : 03:32:19
-D : 03:39:29.85 ± 0.32 s
-R : 03:39:49.69 ± 0.32 s
-E : 03:43:16

   Duration: 19.84 s ± 0.64 s

5. TELESCOPE
   -Type: Newton
   -Aperture: 420 mm
   -Focal length: 1640 mm
   -FOV: 14 x 12 arcmin
   -Mount: Equatorial
   -Motor drive: Yes

6. TIMING & RECORDING
   -Sensor/Camera: Videocamera WAT-910HX, CCIR, 1/2", ICX429ALL sensor
   -Videocamera settings: Shutter = ; Gain = 37/41; Gamma = 1.00
   -Device of recording: Personal computer, Hauppauge HVR-1700 (PCIcard), S-video input, Virtualdub software, uncompressed AVI saved on Harddisk
   -Integration time = 0.040 s
   -Time insertion device: IOTA-VTI, v.1.1.42 

7. OBSERVING CONDITIONS
   -Atmospheric transparency: good
   -Wind: none
   -Star image stability: good
   -Minor Planet Visible: yes

8. ADDITIONAL COMMENTS
   -Target position at: azimut = 208 deg; elevation = 56 deg
   -Moonlight: yes, but not disturbing

   Accordingly to Occultwatcher prediction (IBEROC feed):
   -Rank: 94
   -Probability: 22.2 %
   -Combined magnitude: 12.7-13.2 mag
   -Star magnitude: 14.2 V, 14.2 R
   -Asteroid magnitude: /
   -Lightdrop: 0.4 magV, 0.3 magR
   -Max duration: 19.9 s
   -Event time: 03:39:17 UT
   -Error in time: 9 s
   -Moon distance: 49 deg
   -Moon illumination: 43 %

   -Tangra v. 3.6 was used to generate the lightcurve (aperture photometry, average background).
   -A correction of -0.340 s was applied because of the use of an integration camera.
   -The measured lightdrop is consistent with the prediction.
   -A lightcurve can be seen here:
   http://sposetti.ch/wp-content/uploads/2014/09/2017Oct13_Roberta.png