Ik kijk graag naar sterbedekkingen door de Maan.
Mijn eerste sterbedekking was de bedekking van Aldebaran op 11 april 1978.
Ik heb altijd bedekkingen visueel waargenomen - tót 18 juni 2005.

I love to observe occultations of stars by the Moon.
The first occultation I observed was the occultation of Aldebaran on April 11, 1978.
I have always observed them visual - until June 18, 2005.

Graze of SAO 76970 - 2009 03 31
Regulus Graze - 2007 10 07
Occultation of the double star SAO 76880 - 2007 04 20
Occultation of 42 Librae - 2005 06 18

GRAZE SAO 76970 - Uikhoven, Belgium - 2009 MARCH 31
SUCCESSFUL EXPEDITION OF DOA (Dutch Occultation Association) TO GRAZING OCCULTATION OF SAO 76970 (XZ 6551) - magn. 7.6.

A nice graze, observed from a small town near the Belgian/Dutch border - reduction by Adri Gerritsen.

Timings (including reaction time: in1, out1, in2, out3: all 0,3s; out2, in3: both 0,4s)
in1 21h 59m 21s.5; out1 21h 59m 25s.9
in2 21h 59m 29s.5; out2 22h 00m 46s.1
in3 22h 00m 47s.8; out3 22h 00m 53s.7
Accuracy all timings: 0.2 s.
Telescope OMC140 14cm Rumax, 9 mm Nagler (222x). Observation method: videocamera + time signal DCF77. Time measuring on PC: Adobe Audition 1.5.
Seeing: 2; Transparancy: 1, Temperature +6°C.

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REGULUS GRAZE - Nieuwlande, The Netherlands - 2007 OCTOBER 7
SUCCESSFUL EXPEDITION OF DOA (Dutch Occultation Association) TO GRAZING OCCULTATION OF REGULUS (Alpha LEO).

Watch the video, on Youtube:

Results from my video observation

I taped this video on my Sony TRV240E camcorder, that has a 'video in' function. The film was later imported to the PC using Pinnacle Studio and with the help of VirtualDub I was able to load the avi-file into Limovie. I measured all frames manually, what turned out to be a hell of a job. But it was well worth the effort as you can see below.

for a better resolution: http://www.pbase.com/henkbril/image/86960340

for a better resolution: http://www.pbase.com/henkbril/image/86960344

Adri Gerritsen combined all observations to make this reduction. The straight lines show how each observer saw Regulus moving along the Moon's valleys and hills. A very nice result indeed.

A photographic impression

The DOA observers of the Regulus graze, from left to right:
Hans Govaarts (expedition leader), Henk Masselink, Erwin van Ballegoy, Alex Scholten,
Boelie Boelens, Jan Maarten Winkel, Wim Nobel, Harrie Rutten,
Henk Bril, Albert Ros, Adri Gerritsen, Marion Iris van der Linden,
Jos Warmerdam, Wendy Majoor, Roelof Mink.

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OCCULTATION OF THE DOUBLE STAR SAO 76880

In 2007 I started to film occultations with a WATEC-120N video camera (see above). The WATEC is placed behind the Takahashi Sky90 or behind the OMC 140. On April 20 I had my first success when I taped 5 occultations.

Two of these are of the double star SAO 76880 (= XZ 6391 + XZ 6393; m9.1 + m7.1; separation 21").

THE VIDEO DOESN'T RUN ON ALL PC'S HAVING WINDOWS VISTA
(Why not? I really don't know.)

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Occultation of 42 Librae - 2005 06 18

2005 06 18 - 22h34m02s (Prediction: Low 3.1)
Occultation of 42 Librae, magn. 5.0, altitude 14°, Phase 0.93+.
OMC 140 mm Maksutov-Cassegrain, Philips ToUCam Pro-webcam in primary focus.

Below the relevant frames are shown.

frame 0

frame 1

frame 2

With Adri Gerritsen's excellent program WOTAP the time of occultation was determined to be
22h34m01s.40 (±0s.05).