Moon occults starcluster of Plejades
12 September 2006

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On 12 September 2006 the moon occulted the starcluster of the Plejades (M45). Preparation and predictions for observation were done some days before this event. Assembling of equipment started on 12 September 2006 at 18:30 UTC. In northern Austria first occultations took place during the moonrise. From 20:00 to 22:00 UTC the recording of 20 events was scheduled. One graze occultation, two total disappearances and seventeen reappearances on the west dark side of the moon.

The graze event did not happen and the star SAO 76216 was always visible over moon horizon. The two disappearances of SAO 76199 and SAO 76228 were recorded but exact timing of a star disappearance is always very difficult on the bright side of the moon. So definition of disappearances times was only within some seconds. Three of the seventeen scheduled reappearances were missed by me due to late video record start after changing telescope orientation. But on fourteen reappearance events I had success. Video and data evaluation was done by me in many hours and here are the results.

 

Moon and the starcluster of the Plejades (M45)
Moon occults starcluster of Plejades

 

Observation report

Observer Position Observer 48° 47´ 29.1" North (WGS84) Gerhard Dangl 15° 13´ 59.5" East (WGS84) 3830, Nonndorf 12 560m (MSL) AUSTRIA
TELESCOPE: Type: Newton Focal length: 1200mm Aperture: 254 mm Magnification: video/primary focus/recorded field 1112" x 830" Mount: Equatorial EQ6 Motor drive: Yes TIMING & RECORDING: Timekeeping: GPS 1PPS Garmin18 LVC + KIWI-OSD Sensor/Camera: WAT-120N, CCIR, 1/2" Sony CCD-Sensor ICX419ALL Mode of recording: It=20ms (50 Img/s), Video CCIR, AVI, YUY2, Huffyuv, Device of recording: Xpert V-Stream Videograbber USB2.0, Notebook Harddisk Time insertion: KIWI-OSD OBSERVING CONDITIONS: Atmospheric transparency: fair Wind: 0 - 0.5m/s Star image stability: fair Temperature: 282 Kelvin (+09 deg Celsius) ADDITIONAL COMMENTS: Predictions with LOW 3.1 A total of 14 reappearances on the dark side of the moon recorded Video evaluation accomblished with VirtualDub1.6.16 and Limovie0.9.24 Only clear glass filter (Astronomik) for CCD protection was used 3-D position and timing with Garmin GPS18 LVC receiving 09 satellites Horizontal dilution of precision 1.0, geoidal separation 44.4m
Diagram of equipment setup
Diagram of equipment setup
Table of predictions and results of observation with video measurements
Nr. Date Pred. time UT Video time UT P L SAO Mag Sp D Alt Az PA Name d m y hh:mm:ss +/-s hh:mm:ss.sss +/- s deg deg deg
1 12 Sep 2006 20:18:37 1 20:18:37.523 0.010 R D 76172 4.1 B6 9 63 266 Merope (23 Tauri) 2 12 Sep 2006 20:31:39 1 20:31:39.987 0.010 R D 76193 7.0 A1 10 65 217 3 12 Sep 2006 20:39:12 1 20:39:12.149 0.010 R D 76188 8.3 G0 S 12 66 289 4 12 Sep 2006 20:40:10 1 20:40:11.529 0.010 R D 76197 7.3 B9 W 12 67 241 5 12 Sep 2006 20:41:31 1 20:41:33.850 0.010 R D 76192 6.3 A0 U 12 67 284 24 Tauri 6 12 Sep 2006 20:45:12 1 20:45:12.311 0.010 R D 76199 2.8 B7 K 13 68 279 Alcyone (Eta Tauri) 7 12 Sep 2006 20:59:33 1 20:59:30.835 0.010 R D 76225 6.5 F0 U 14 70 195 26 Tauri 8 12 Sep 2006 21:06:50 1 21:06:51.498 0.010 R D 76231 8.1 A2 15 71 197 9 12 Sep 2006 21:16:20 4 21:16:17.061 0.010 R D 76234 7.5 A0 17 72 326 10 12 Sep 2006 21:21:34 1 21:21:33.843 0.010 R D 76228 3.6 B8 U 18 74 238 Atlas (27 Tauri) 11 12 Sep 2006 21:23:19 2 21:23:17.783 0.010 R D 76236 6.6 B9 V 18 74 312 12 12 Sep 2006 21:25:28 1 21:25:29.744 0.010 R D 76229 5.1 B7 K 19 74 254 Pleione (28 BU Tauri) 13 12 Sep 2006 21:32:34 1 21:32:34.387 0.010 R D 76237 8.0 A0 20 75 273 14 12 Sep 2006 21:44:16 1 21:44:17.570 0.010 R D 76249 7.6 A0 22 77 286 File section for viewing or download - 14 reappearances in chronological order
1SAO 76172
Diagram image
SAO 76172
Excel data sheet
SAO 76172
MPEG-4 video 880kB
SAO 76172
Uncompressed video 7.2MB
 
2SAO 76193
Diagram image
SAO 76193
Excel data sheet
SAO 76193
MPEG-4 video 940kB
SAO 76193
Uncompressed video 7.6MB
 
3SAO 76188
Diagram image
SAO 76188
Excel data sheet
SAO 76188
MPEG-4 video 940kB
SAO 76188
Uncompressed video 7.6MB
 
4SAO 76197
Diagram image
SAO 76197
Excel data sheet
SAO 76197
MPEG-4 video 920kB
SAO 76197
Uncompressed video 7.5MB
 
5SAO 76192
Diagram image
SAO 76192
Excel data sheet
SAO 76192
MPEG-4 video 940kB
SAO 76192
Uncompressed video 7.6MB
 
6SAO 76199
Diagram image
SAO 76199
Excel data sheet
SAO 76199
MPEG-4 video 880kB
SAO 76199
Uncompressed video 6.6MB
 
7SAO 76225
Diagram image
SAO 76225
Excel data sheet
SAO 76225
MPEG-4 video 670kB
SAO 76225
Uncompressed video 5.5MB
 
8SAO 76231
Diagram image
SAO 76231
Excel data sheet
SAO 76231
MPEG-4 video 820kB
SAO 76231
Uncompressed video 6.4MB
 
9SAO 76234
Diagram image
SAO 76234
Excel data sheet
SAO 76234
MPEG-4 video 710kB
SAO 76234
Uncompressed video 6.1MB
 
10SAO 76228
Diagram image
SAO 76228
Excel data sheet
SAO 76228
MPEG-4 video 680kB
SAO 76228
Uncompressed video 4.8MB
 
11SAO 76236
Diagram image
SAO 76236
Excel data sheet
SAO 76236
MPEG-4 video 680kB
SAO 76236
Uncompressed video 6.3MB
 
12SAO 76229
Diagram image
SAO 76229
Excel data sheet
SAO 76229
MPEG-4 video 530kB
SAO 76229
Uncompressed video 4.6MB
 
13SAO 76237
Diagram image
SAO 76237
Excel data sheet
SAO 76237
MPEG-4 video 720kB
SAO 76237
Uncompressed video 6.3MB
 
14SAO 76249
Diagram image
SAO 76249
Excel data sheet
SAO 76249
MPEG-4 video 780kB
SAO 76249
Uncompressed video 6.4MB


My report sent to the International Lunar Occultation Center (ILOC) in Japan:
(Created with Occult3.6 from Dave Herald)

PLACE NAME     Mobile station
ADDRESS        Nonndorf 12, A-3830, Austria
E-MAIL ADDRESS gerhard@dangl.at
REPRESENTATIVE Gerhard Dangl
REPORTED TO    ILOC

TA  NED  25.4  120.0   15 13 59.5  E  48 47 29.1  N  604.4GPS (WGS84)

OA  Gerhard Dangl                        

012006091220183752 S  76172           2V RS  0011   22  9                    AAA
    Video time insertion with KIWI-OSD and GPS
022006091220313999 S  76193           2V RS  0011   222 9                    AAA
    Video time insertion with KIWI-OSD and GPS
032006091220391215 S  76188           2V RS  0011   222 9                    AAA
    Video time insertion with KIWI-OSD and GPS
042006091220401153 S  76197           2V RS  0011   222 9                    AAA
    Video time insertion with KIWI-OSD and GPS
052006091220413385 S  76192           2V RS  0011   222 9                    AAA
    Video time insertion with KIWI-OSD and GPS
062006091220451231 S  76199           2V RS  0011   222 9                    AAA
    Video time insertion with KIWI-OSD and GPS
072006091220593084 S  76225           2V RS  0011   22  9                    AAA
    Video time insertion with KIWI-OSD and GPS
082006091221065150 S  76231           2V RS  0011   222 9                    AAA
    Video time insertion with KIWI-OSD and GPS
092006091221161706 S  76234           2V RS  0011   222 9                    AAA
    Video time insertion with KIWI-OSD and GPS
102006091221213384 S  76228           2V RS  0011   22  9                    AAA
    Video time insertion with KIWI-OSD and GPS
112006091221231778 S  76236           2V RS  0011   222 9                    AAA
    Video time insertion with KIWI-OSD and GPS
122006091221252974 S  76229           2V RS  0011   22  9                    AAA
    Video time insertion with KIWI-OSD and GPS
132006091221323439 S  76237           2V RS  0011   222 9                    AAA
    Video time insertion with KIWI-OSD and GPS
142006091221441757 S  76249           2V RS  0011   222 9                    AAA
    Video time insertion with KIWI-OSD and GPS


The pre-reduction results of my report returned by Mr. Mitsuo Kawada:
(International Lunar Occultation Center (ILOC) in Japan)

INTERNATIONAL LUNAR OCCULTATION CENTER (ILOC)  PRELIMINARY REDUCTION OF LUNAR OCCULTATION OBSERVATIONS  FOR REPORT R1411
TEL CODE    1 LOCATION(E 15 13 59.50 N48 47 29.10  604.4M (DM 84 WGS84       )    TELESCOPE(AP  25CM FL 120CM TYPE NED)
OBS CODE    1 Gerhard Dangl                                     
 DATE     TIME(UTC)    AGE  CT STAR NO. MAG PH  TEL  OBS  REC O-C(")HW(") K-R(DEG)KM(DEG) H92     SOURCE     SAO    DM         REPORT DAT.NO.
 6  9 12  20 18 37.52  20.0 S    76172  4.3 RD    1    1    1  0.07 -0.71   190.7  265.7  H  4874 P    17608  76172 +23  522   141100  0001 
 6  9 12  20 31 39.99  20.1 S    76193  6.8 RD    1    1    1 -0.82  0.72   142.4  217.4  H  4901 P    17692  76193 +23  537   141100  0002 
 6  9 12  20 39 12.15  20.1 S    76188  8.7 RD    1    1    1 -0.28 -0.03   213.8  288.9  H  4895 T 18002222  76188 +23  531   141100  0003 
 6  9 12  20 40 11.53  20.1 S    76197  7.3 RD    1    1    1 -0.28  0.82   165.5  240.6  H  4905 T 18001567  76197 +23  538   141100  0004 
 6  9 12  20 41 33.85  20.1 S    76192  6.3 RD    1    1    1 -0.26 -0.09   209.2  284.3  H  4900 T 18002201  76192 +23  536   141100  0005 
 6  9 12  20 45 12.31  20.1 S    76199  2.9 RD    1    1    1 -0.28 -0.32   203.9  279.0  H  4911 P    17702  76199 +23  541   141100  0006 
 6  9 12  20 59 30.84  20.1 S    76225  6.6 RD    1    1    1 -0.68  0.44   119.5  194.6  H  4951 P    17832  76225 +23  556   141100  0007 
 6  9 12  21  6 51.50  20.1 S    76231  8.1 RD    1    1    1 -0.36  0.38   122.2  197.3  H  4960 T 18001406  76231 +23  559   141100  0008 
 6  9 12  21 16 17.06  20.1 S    76234  7.5 RD    1    1    1 -0.84  0.50   250.6  325.8  H  4963 T 18040265  76234 +23  560   141100  0009 
 6  9 12  21 21 33.84  20.1 S    76228  3.6 RD    1    1    1 -0.31  0.27   162.9  238.2  H  4957 P    17847  76228 +23  557   141100  0010 

 6  9 12  21 23 17.78  20.1 S    76236  6.6 RD    1    1    1 -0.53  0.10   237.3  312.5  H  4964 P    17862  76236 +23  561   141100  0011 
 6  9 12  21 25 29.74  20.1 S    76229  5.2 RD    1    1    1  0.92  0.28   179.2  254.5  H  4958 P    17851  76229 +23  558   141100  0012 
 6  9 12  21 32 34.39  20.1 S    76237  8.0 RD    1    1    1 -0.38 -0.23   197.7  273.0  H  4965 T 18000901  76237 +23  562   141100  0013 
 6  9 12  21 44 17.57  20.1 S    76249  7.5 RD    1    1    1 -0.29  0.34   210.6  286.0  H  4981 T 18000985  76249 +23  567   141100  0014 


© 2006 G. Dangl
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11. Dezember 2006
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