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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: 11 Dec 2016
STAR: 4U 501-1113
ASTEROID: (3970) Herran

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 : 17:59:18
-D : 18:01:28.65 ± 0.04 s
-R : 18:01:29.45 ± 0.04 s
-E : 18:06:47

Duration: 0.80 s ± 0.08 s

TELESCOPE
-Type: Schmidt-Cassegrain, Celestron 11-inch
-Aperture: 280 mm
-Focal length: 930 mm (with focal reducer)
-FOV: about 23x18 arcmin
-Mount: Equatorial
-Motor drive: Yes

6. TIMING & RECORDING
Sensor/Camera: Videocamera WAT-910HX, CCIR, 1/2", ICX429ALL sensor
Videocamera settings: Shutter = x4; Gain = 41/41; Gamma = 1.00
Device of recording: Personal computer, Imaging Source DFG/SV1 PCI grabber, composite input, Virtualdub software, saved as uncompressed file on Harddisk
Timekeeping: GPS 1PPS (US Global Sat EM-406A)
Time insertion device: IOTA-VTI, v.1.1.42
Integration time: 0.080 s

7. OBSERVING CONDITIONS
Atmospheric transparency: fair/good, some thin clouds
Wind: fair
Star image stability: fair
Minor Planet Visible: -

8. ADDITIONAL COMMENTS
-Target position at: azimut = 160 deg; elevation = 52 deg
-Moonlight: yes, but not disturbing

Accordingly to Occultwatcher prediction (IBEROC feed):
-Rank: 11
-Probability: 0.2 %
-Combined magnitude: 12.0 mag
-Asteroid magnitude: 16.6 mag
-Lightdrop: 4.6 mag
-Max duration: 1.2 s
-Event time: 18:01:19 UT
-Error in time: 8 s
-Moon distance: 32 deg
-Moon illumination: 92 %

-Tangra v. 3.6 was used to generate the lightcurve (aperture photometry, average background).
-A correction of -0.060 s was applied because of the use of an integration camera.
-A lightcurve can be seen here:
http://sposetti.ch/wp-content/uploads/2014/09/2016DEC11_Herran.png