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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.
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 44.4mDiagram 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
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
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
11. Dezember 2006 |
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