An Unusual Occultation…. or was it a Grazing Occultation ?

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Presentation transcript:

An Unusual Occultation…. or was it a Grazing Occultation ?

 

Let’s Investigate: November 26, 1960 UT Observed by Leo Deming and son From Terre Haute, Indiana Timed occultation of ZC 3333, m = +6.8 Leo Deming : 8″ reflector 98x son : 5″ refractor 20x Observed D R D in 0.3 sec  D = 1:07:32 UT

Az = 197°, Alt = 40°

.

1 arc minute N

ZC 3333 is a multiple star !

ZC 3333 data from the WDS: STF2935 AB 1782 2012 108 311 306 3.0 2.4 6.79 7.88 STF2935 AC 1892 2000 9 358 357 70.0 70.1 6.79 11.37 STF2935 AD 1913 2000 7 277 277 77.2 74.4 6.79 14.17 Dates PA° Sep″ Mag N C C D D B A

Deming & Son - - 1:07:32 UT OCCULT - 1:07:26 UT, 6 seconds earlier LOW - 1:07:33 UT, only 1.0 second later  Call Dunham

Sources of Error Lunar theory – accuracy of Moon’s motion over 55 years Location of Leo Deming & Son’s observation Leo Deming’s timing method/accuracy

CONCLUSIONS Leo Deming & Son did not see a grazing occultation Leo Deming & Son observed a total occultation of a double star Mystery Solved !!