+--------------------------------+ +--------------------------------+

ASTERIODAL OCCULTATION - REPORT FORM

+--------------------------------+ +--------------------------------+

EAON & IOTA-ES

EUROPEAN ASTEROIDAL OCCULTATION NETWORK

INTERNATIONAL OCCULTATION TIMING ASSOCIATION EUROPEAN SECTION

+--------------------------------+ +--------------------------------+

1. DATE: 31 Dec 2016
STAR: 4U 545-29824
ASTEROID: (1076) Viola

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 : 22:03:57
-D : 22:12:22.35 ± 0.04 s
-R : 22:12:23.55 ± 0.04 s
-E : 22:17:06

Duration: 1.20 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: good
Wind: no
Star image stability: good
Minor Planet Visible: -

8. ADDITIONAL COMMENTS
-Target position at: azimut = 147 deg; elevation = 59 deg
-Moonlight: none

Accordingly to Occultwatcher prediction (IBEROC feed):
-Rank: 31
-Probability: 8.7 %
-Lightdrop: 1.6 mag
-Max duration: 2.7 s
-Event time: 22:12:21 UT
-Error in time: 6 s

-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.
-Measured lightdrop: 1.5 mag.
-A lightcurve can be seen here:
http://sposetti.ch/wp-content/uploads/2014/09/2016DEC31_Viola.png