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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: 8 Oct 2016
STAR: TYC 5242-00199-1
ASTEROID: (67) Asia

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 : 21:26:28
-D : 21:31:14.02  ± 0.04 s
-R : 21:31:21.14  ± 0.04 s
-E : 21:36:30

Duration: 7.12 s ± 0.08 s

5. TELESCOPE
Type: Newton
Aperture: 420 mm
Focal length: about 1000 mm (with focal reducer)
Magnification: -
Mount: Equatorial
Motor drive: Yes

6. TIMING & RECORDING
Timekeeping: GPS 1PPS (US Global Sat EM-406A)
Camera: Videocamera WAT-902H Ultimate, 1/2" sensor, CCIR
Camera settings: Gamma = OFF, Gain = LO
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: fair/bad
Wind: no
Star image stability: good
Minor Planet Visible: yes

8. ADDITIONAL COMMENTS

-Target position at azimut: 183 deg (South) and elevation 42 deg
-No moonlight
-Limiting naked eye luminosity around the target area: 3 mag.

Accordingly to Occultwatcher prediction (IOTA feed):
-Rank: 100
-Probability: 99.1 %
-Lightdrop: 1.0 mag
-Max duration: 13.0 s

-Tangra v. 3.5 was used to produce the lightcurve.
-A Schmidt-Cassegrain 11-inch telescope was placed 2.5 m north and was observing the same event. It was equipped with a Watec 910HX/RC videocam. Shutter = 1/50, Manual Gain = 35/41; Gamma = 1.00. Both instruments show similiar results.
-Both lightcurves can be seen here:
http://sposetti.ch/wp-content/uploads/2014/09/Asia_C11_N420_lightcurve_11.png