occultation during the coming lunar eclipse
The occultation of 4.8-mag. 51 Ophiuchi (ZC 2523) will be spectacular in China, Taiwan, south-central Siberia, & s.e. Asia, and quite good across India and Sri Lanka.The brightest star occulted during this eclipse will be 4.8-mag.
51 Ophiuchi = ZC 2523 = SAO 185470.A map showing the region of visibility, and local predictions for hundreds of Asian cities, are on Rob Robinson's IOTA Web page for the occultation at http://www.lunar-occultations.com/iota/0615zc2523tot.htm .
Besides the areas mentioned above, the occultation will also be visible during totality as seen from Korea and s.w. Japan, but low altitude and brightening morning twilight may hinder observation in those areas.The occultation will also occur west of India, in the Middle East (Egypt and Turkey to Pakistan) and southeastern Europe, but it will occur against the uneclipsed sunlit part of the Moon there, and won't be observable.In the table of total occultation predictions, under the "CA" column, the occultation will be visible if a number (known as the umbral distance) and a "U" are under the "CA" (cusp angle) column; a value of 0 indicates that the occultation occurs at a part of the Moon at the center of the umbral shadow, while 100 is at the edge of the umbra.An "S" indicates that the event occurs against part of the Moon that is not in the umbra, and will thus be against the uneclipsed sunlit part of the Moon.
As noted before, information about the spectacular grazing occultation of 51 Oph, visible in a narrow path crossing southern Thailand, central Cambodia, and central Vietnam, as well as many other grazing occultations of fainter stars, was posted on a Web page at http://www.asteroidoccultation.com/observations/le11615.htm
.The graze of 51 Oph will occur against parts of the Moon in the umbra east of longitude 78 deg. east, and will occur during totality east of long. 89 deg. east.Additional information about this rare lunar eclipse graze is at http://www.lunar-occultations.com/iota/0615zc2523.htm , a Web page set up by Rob Robinson, including predicted Kaguya profiles for the event.West of longitude 78 deg. east, the graze will be against the uneclipsed sunlit limb of the Moon and very difficult or impossible to observe.
David Dunham, [email protected]
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