Earthmoon occults star Regulus on daylight sky

Wednesday, May 23, 2007

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Link to my video and images of this Regulus occultation


On Wednesday, May 23, 2007 the Earthmoon (48% lit) occults star Regulus on the bright daylight sky. In Woodquarter the occultation happens on southeast sky in an elevation of 48 degrees. In Woodquarter this occultation is a total one. The star will disappeare behind the dark side of the moon disk at 15h23 UTC and will reappear about 26 minutes later at 15h49 UTC on the bright moon limb. The sun will be than in an elevation of 30 degrees on western sky and in a distance of 87 degrees to the moon.

In a small zone across europe of few kilometers width this star occultation can be observed as a grazing one. There the star can disappear behind moon mountains and reappear through moon valleys several times.

About this grazing occultation an extra page exist with Data and interactive map about the path across Europe.

For a sucessfull observation of this occultation a telescope with at least 4 Inches (10cm) should be used. Never look in the sun with the telescope. Your eye would be damaged immediately and for ever.


Data table for total occultation in Woodquarter (all times in UTC)
Occultation Predictions for Nonndorf in Mai 2007
E.Long.   15 14  8.2   Lat.  48 47 13.5   Alt. 590m.   T.dia 250mm.   dMag 1.5

      day  Time   P   Star  Sp  Mag    % Elon Sun  Moon   CA   PA  VA  WA Libration   A   B   RV   Cct   R.A. (J2000)  Dec
 y  m  d  h  m  s      No  D       V  ill     Alt Alt Az   o    o   o   o   L    B   m/o m/o "/sec   o  h  m   s    o  m  s
07 05 23 15 23 38 D    1487SB7  1.4   48+  88  30 48 142   6S 194 219 176 +6.6 -1.0 -0.7-6.7 .124  -71 10  8 22.3  11 58  2
      1487 = Regulus = alpha Leonis                
      1487 is triple :   1.3  8.1  175"  308.0 :   1.3       217"  274.0
Graze of 1487SB7 nearby at Lat = +47.76 -0.38(E.Long -15.24), CA = -13.1S
      23 15 37 15 Gr   1487SB7  1.4  48+  88  28 50 146
Closest distance to graze path is 99km at azimuth 210
07 05 23 15 49 42 R    1487SB7  1.4   48+  88  26 50 151 -32S 233 252 214 +6.6 -1.0 +3.8+5.4 .123 -109 10  8 22.3  11 58  2
      1487 = Regulus = alpha Leonis                
      1487 is triple :   1.3  8.1  175"  308.0 :   1.3       217"  274.0
Table created with Occult3.6 from Dave Herald


The star occultation of Regulus in Woodquarter at the bottom dark moon limb at 15:23:38 UTC
Start of star occultation of Regulus

 

The end of the star occultation of Regulus in Woodquarter at the bottom bright moon limb at 15:49:42 UTC
End of the star occultation of Regulus
Diagrams created with Guide 8 from Bill J Gray


Video and images of Regulus daytime occultation - 2007/05/23

Earthmoon occults Regulus on dark limb - real time video MPEG4 (1.6MB)

Regulus reappearance on bright moon limb - real time video MPEG4 (1.8MB)

Earthmoon moving away from Regulus - time lapse video MPEG4 (1.8MB)

Video equipment setup

Some additional images from the observation beside our house
Observation image 1   Observation image 2   Observation image 3   Observation image 4
 
Observation image 5   Observation image 6   Observation image 7   Observation image 8


                      Result of Regulus occultation 2007/05/23 in shortform

Observer Position                               Observer
48  47  13.5"  North  (WGS84)                 Gerhard Dangl
15  14  08.4"  East   (WGS84)                 3830, Nonndorf 12
594m             Height (WGS84)                 AUSTRIA

Regulus disappearance time: 15:23:39.184  (+/-10ms) UTC - daytime, dark limb
Regulus reappearance  time: 15:49:36.520  (+/-10ms) UTC - daytime, bright limb

Occultation duration      : 00:25:57.336  (+/-20ms) UTC


The pre-reduction results of my report returned by ILOC: (International Lunar Occultation Center (ILOC) in Japan) INTERNATIONAL LUNAR OCCULTATION CENTER (ILOC) PRELIMINARY REDUCTION OF LUNAR OCCULTATION OBSERVATIONS FOR REPORT R1583 TEL CODE 1 LOCATION(E 15 14 8.40 N48 47 13.50 594.0M (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. 7 5 23 15 23 39.18 6.8 S 98967 1.4 DD 1 1 1 0.05 -0.84 79.1 194.6 H 15260 P 49669 98967 +12 2149 158300 0001 7 5 23 15 49 36.52 6.8 S 98967 1.4 RB 1 1 1 -0.43 0.54 117.1 232.6 H 15260 P 49669 98967 +12 2149 158300 0002

© 2007 G. Dangl
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13 September 2007
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