Seite in Deutsch
| Seite in Deutsch | Frameless version of this page |
On April 13, 2008 the Earthmoon occulted the starcluster Praesepe - M44. At about 17h00 UTC the moon entered in an elevation of 58° above the southeast horizon the starcluster of Praesepe and occulted many stars with the dark limb. About one hour after midnight the moon had apparently moved through and was now on the eastside of the starcluster.
The occultations of 22 stars of starcluster M44 on the dark limb was captured with my equipment on video with an accuracy of some milliseconds. Evaluation of the video was done later.
Diagram of equipment setup
Observation report
Date Observer Position - Nonndorf Observer 2008/04/13 48° 47´ 13.3" North (WGS84) Gerhard Dangl Star 15° 14´ 06.8" East (WGS84) 3830, Nonndorf 12 Starcluster Praesepe (M44) 543.5m (MSL), 587.9m (WGS84) AUSTRIA
TELESCOPE: Type: Newton Focal length: 1200mm Aperture: 254 mm Magnification: video/primary focus/FOV 15.8'x13.7' (640x576, 1.48"x1.43" per pixel) Mount: Equatorial EQ6 with EQMOD Motor drive: Yes TIMING & RECORDING: Timekeeping: GPS 1PPS Garmin18 LVC + KIWI-OSD Sensor/Camera: WAT-902H2 Ultimate, 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: good Wind: No Star image stability: good Temperature: 276 Kelvin (+03 deg Celsius) ADDITIONAL COMMENTS: Predictions with Occult 4 and LOW 4 Video evaluation accomblished with VirtualDub1.7.8 and Limovie0928c Only clear glass filter (Astronomik) for CCD protection was used 3-D position and timing with Garmin GPS18 LVC receiving 08 satellites Horizontal dilution of precision 1.5, geoidal separation 44.4m
Occultation prediction for Nonndorf_0, Austria
E. Longitude 15 14 8.4, Latitude 48 47 13.5, Alt. 0m; Telescope dia 25cm; dMag 2.0
day Time P Star Sp Mag Mag % Elon Sun Moon CA PA VA AA Libration A B RV Cct R.A. (J2000) Dec
y m d h m s No D v r V ill Alt Alt Az o o o o L B m/o m/o "/sec o h m s o m s
08 Apr 13 19 15 0 D 1292 F0 6.7 6.5v 61+ 103 58 210 45N 60 39 46 +6.2 -1.6 +2.7+1.2 .212 60 8 39 42.7 19 46 42
R1292 = 38 Cancri (BT)
1292 = BT Cnc, 6.66, range 0.06 to ( 0.06V, Type DSCTC, Period 0.10228 days
08 Apr 13 19 16 55 D 1293SK0 6.8 s 61+ 103 58 211 84S 111 90 98 +6.2 -1.6 +1.4-1.2 .415 8 8 39 50.7 19 32 27
1293 is multiple: 6.8 9.9 0.49" 225.7 : 6.7 9.8 0.50" 238.2 : 6.7 6.9 92" 62.1 : 7.0 9.0 100" 88.0
1293 = NSV 04171, 6.52 to 6.61V
08 Apr 13 19 19 28 D 1294SA0 7.3 7.2S 61+ 103 58 212 89S 106 85 93 +6.2 -1.6 +1.4-1.1 .409 13 8 39 56.5 19 33 11
1294 is quadruple: 6.9 11.9 1.0" 291.0 : 6.9 7.2 45" 157.2 : 6.9 6.7 92" 242.1
1294 = NSV 04175, 7.32V
08 Apr 13 19 20 37 D 98014SA0 7.5 7.3s 61+ 103 58 212 87S 108 86 95 +6.2 -1.6 +1.4-1.2 .412 11 8 39 57.8 19 32 29
98014 is quadruple: 8.8 8.8 350.0 : 7.2 6.9 45" 337.2 : 9.0 7.0 100" 268.0
98014 = NSV 04174, 7.53, range 0.01 to ( 0.01V
08 Apr 13 19 32 12 D 98018WA0 7.5 7.4 61+ 103 57 217 86N 101 77 88 +6.2 -1.6 +1.5-1.1 .403 18 8 40 18.1 19 31 55
98018 is double: 7.4 6.3 137" 70.9
08 Apr 13 19 37 8 D 1299WA* 6.3 6.2 61+ 103 56 219 80N 95 69 81 +6.2 -1.6 +1.6-0.9 .387 25 8 40 27.0 19 32 41
R1299 = epsilon Cancri
1299 is double: 6.3 7.4 137" 250.9
08 Apr 13 19 37 23 D 1298SK0 6.4 5.9 61+ 103 56 219 52N 67 41 54 +6.2 -1.6 +2.3+0.3 .260 52 8 40 22.1 19 40 12
1298 is quadruple: 6.4 10.4 20.9" 55.1 : 6.4 7.7 64" 343.1 : 6.4 9.4 83" 42.9
08 Apr 13 19 37 57 D 98020SA0 7.6 7.5 61+ 103 56 219 47N 63 36 49 +6.2 -1.6 +2.5+0.6 .232 57 8 40 20.7 19 41 12
98020 is quadruple: 9.1 9.1 0.050" 350.0 : 7.7 6.4 64" 163.1 : 7.7 9.4 76" 90.0
08 Apr 13 19 38 40 d X207729 10.3 61+ 103 56 219 50N 65 39 52 +6.2 -1.6 +2.4+0.4 .249 54 8 40 23.3 19 40 24
08 Apr 13 19 42 53 d 98023MF2 9.2 9.0 61+ 103 56 221 43N 58 31 45 +6.2 -1.6 +2.7+1.0 .206 61 8 40 26.1 19 41 11
98023 is triple: 9.4 7.7 76" 270.0 : 9.4 6.4 83" 222.9
08 Apr 13 19 45 12 D 1297cA9 6.8 6.6S 61+ 103 55 222 60S 135 108 122 +6.2 -1.6 +0.9-2.0 .411 -16 8 40 20.1 19 20 56
1297 is double: 6.8 0.10" 160.0
1297 = NSV 17953, 6.78V, Type DSCT:
08 Apr 13 19 45 23 D 98009 A7 7.6 7.6v 61+ 103 55 222 25S 170 142 157 +6.2 -1.6 +0.1-3.3 .270 -51 8 39 44.7 19 16 31
98009 = BU Cnc, 7.67, range 0.03 to ( 0.03V, Type DSCTC, Period 0.071 days
08 Apr 13 19 57 33 D 1303 A6 6.8 6.7v 61+ 103 54 226 56N 71 41 58 +6.1 -1.5 +2.1-0.2 .287 48 8 40 56.3 19 34 49
1303 = EP Cnc, 6.76, range 0.03 to ( 0.03V, Type DSCTC
08 Apr 13 19 59 33 d X 13164 F5 9.5 9.3 61+ 103 53 226 63S 132 101 119 +6.1 -1.5 +0.9-1.9 .423 -12 8 40 46.1 19 18 35
08 Apr 13 20 4 10 d X111059 10.2 10.0 61+ 103 53 228 67N 82 50 68 +6.1 -1.5 +1.7-0.7 .343 38 8 41 10.0 19 30 32
08 Apr 13 20 6 29 D 98027 A8 7.8 7.7v 61+ 103 52 229 44S 152 120 138 +6.1 -1.5 +0.5-2.5 .369 -32 8 40 39.2 19 13 42
98027 = BN Cnc, 7.80, range 0.03 to ( 0.03V, Type DSCTC, Period 0.0388205 days
08 Apr 13 20 7 56 d X111004 10.7 10.5 61+ 103 52 229 44S 151 119 138 +6.1 -1.5 +0.5-2.5 .371 -32 8 40 41.9 19 13 25
08 Apr 13 20 35 41 d 98044 A5 9.3 9.1 62+ 103 49 237 52S 143 107 129 +6.1 -1.5 +0.5-2.3 .411 -23 8 41 36.2 19 8 34
08 Apr 13 20 39 25 D 98053 A7 7.9 7.8v 62+ 103 48 239 59N 75 38 61 +6.1 -1.5 +1.7-0.7 .318 45 8 42 6.5 19 24 41
98053 = BX Cnc, 7.96, range 0.02 to ( 0.02V, Type DSCTC, Period 0.053 days
08 Apr 13 20 40 39 d X 13177cG0 10.2 9.9 62+ 103 48 239 18S 177 140 163 +6.1 -1.4 -0.4-3.5 .242 -58 8 41 7.4 19 4 16
X 13177 is double: 9.3 10.1 0.001" 49.6
08 Apr 13 21 16 54 d 98054 A7 7.9 7.8v 62+ 104 42 248 19S 176 136 162 +6.0 -1.4 -0.5-3.2 .257 -57 8 42 10.8 18 56 4
98054 = BY Cnc, 7.91, range 0.01 to ( 0.01V, Type DSCTC, Period 0.058 days
08 Apr 13 21 17 55 d 98064cG0 9.5 9.3 62+ 104 43 248 77S 118 78 105 +6.0 -1.4 +0.7-1.8 .469 2 8 43 7.1 19 4 6
98064 is double: 9.9 9.9 0.10" 131.0
Results of recording and measurements (22 disappearances) with 2 events (SAO 98019 and SAO 98064) showing a double star effect 1 SAO 98006 D 19:14:57.955 (+/-10ms) 50% 2 SAO 98010 D 19:16:55.113 (+/-10ms) 50% 3 SAO 98013 D 19:19:27.491 (+/-10ms) 50% 4 SAO 98014 D 19:20:37.250 (+/-10ms) 50% 5 SAO 98018 D 19:32:11.639 (+/-10ms) 50% 6 SAO 98024 D 19:37:07.735 (+/-10ms) 50% 7 SAO 98021 D 19:37:21.254 (+/-10ms) 50% 8 SAO 98020 D 19:37:55.634 (+/-10ms) 50% 9 XZ 207729 D 19:38:38.913 (+/-20ms) 50% 10 SAO 98023 D 19:42:52.169 (+/-10ms) 50% Double star effect 11a SAO 98019 D 19:45:12.657 (+/-10ms) 100% 11b SAO 98019 D 19:45:12.667 (+/-10ms) 56% Preceding west component 11c SAO 98019 D 19:45:12.677 (+/-10ms) 47% 11d SAO 98019 D 19:45:12.697 (+/-10ms) 17% Step start 11e SAO 98019 D 19:45:12.817 (+/-10ms) 19% Step end 11f SAO 98019 D 19:45:12.837 (+/-10ms) 6% Following east component 11g SAO 98019 D 19:45:12.867 (+/-10ms) 0%
Limovie diagram SAO 98019 |
Graph SAO 98019 |
Video SAO 98019 |
Limovie diagram SAO 98064 |
Graph SAO 98064 |
Video SAO 98064 |
Diagrams created with Software Limovie from Kazuhisa Miyashita.
May 03, 2008 |
|
Site Home |
Questions and suggestions to =>