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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: 01 Mar 2016
STAR: 2UCAC 21800401
ASTEROID: (7) Iris

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: No
Event Time (UTC) Accuracy + Comments
code: HH:MM:SS.ss S.sss

-S : 04:23:23
-D : 04:26:18.60  ± 0.08 s
-R : 04:26:24.36  ± 0.08 s
-E : 04:30:24

Duration: 5.76 s ± 0.16 s

TELESCOPE
Type: Schmidt-Cassegrain, Celestron 11-inch
Aperture: 280mm
Focal length: 930mm (with focal reducer)
Magnification: -
Mount: Equatorial
Motor drive: Yes

6. TIMING & RECORDING
Sensor/Camera: Videocamera WAT-910HX, CCIR, 1/2", ICX429ALL sensor
Videocamera settings: Shutter = x8; Gain = 35/42; Gamma = 1.00
Device of recording: Personal computer, Imaging Source DFG/SV1 PCI, S-video, CCIR, Virtualdub software, saved on Harddisk, Huffyuv
Timekeeping: GPS 1PPS (US Global Sat EM-406A)
Time insertion device: IOTA-VTI, v.1.1.42
Integration time: 0.160 s

7. OBSERVING CONDITIONS
Atmospheric transparency: good
Wind: yes
Star image stability: poor, strong turbulence
Minor Planet Visible: yes

8. ADDITIONAL COMMENTS

-Target position: azimut: 164 deg , elevation 17 deg
-Moonphase: 58 %
-Moon distance: 12,5 deg from target
-Predicted lightdrop: 0.36 mag
-Predicted max duration: 15.9 s
-Tangra v. 3.5 was used to produce the lightcurve.
-A time correction was performed because of the use of an integrating camera.
-A lightcurve can be seen here:
http://sposetti.ch/wp-content/uploads/2014/09/2016_mar_01_Iris.png