Central Bureau for Astronomical Telegrams
IAUC 5154: BARIUM AND LITHIUM CLOUD RELEASES
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Circular No. 5154
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
BARIUM AND LITHIUM CLOUD RELEASES
R. J. Howard and D. Reasoner, National Aeronautics and Space
Administration, report that the Combined Release and Radiation
Effects Satellite will release clouds of green and purple Ba and red
Li vapor in the earth's magnetosphere during this month. The releases
will result in clouds of artificially injected charged particles,
which, when illuminated by the sun, will be about the size of
the full moon and nearly as bright. The releases should be visible
from most of the western hemisphere. A total of seven releases are
planned: 3 small Ba clouds (type 1 under T in the table below),
and 1 large Ba and 3 Li clouds (type 2). For viewers in the U.S.
and Canada, the releases will be at elevations between 10 deg and 50
deg above the southern horizon. The Li releases are expected to be
visible for about 5 min, and the Ba releases for about 15 min. All
possible windows are given in the table below; each window is either
a single point (only one time given per line) or a span (two times
per line), and the times (1991 UT) and satellite positions (altitude
in km) at the opening and closing are listed.
Jan. lambda phi Alt. T Jan. lambda phi Alt.
11.280 - 58.5 +18.1 14899 1
13.304 -103.5 +16.8 6149 1 13.332 - 78.1 +18.0 15035
13.497 - 85.7 + 8.5 33530 2 13.572 - 96.3 + 3.3 28738
15.356 -123.6 +17.0 6091 1 15.383 - 97.9 +17.9 14992
15.442 - 91.9 +14.2 26972 1
15.551 -106.0 + 7.8 33500 2 15.624 -116.2 + 2.8 28760
16.372 - 42.0 + 7.5 33488 2 16.444 - 52.1 + 2.5 28735
18.228 - 78.7 +17.3 6137 1 18.311 - 47.3 +13.9 26511
18.417 - 60.9 + 7.5 33586 2 18.497 - 72.1 + 2.0 28688
20.279 - 98.7 +17.4 6127 2 20.306 - 73.5 +17.6 14828
20.365 - 67.4 +13.4 26788 1
20.413 - 72.4 +10.4 31888 2 20.547 - 91.9 + 1.6 28738
20.576 - 94.0 - 1.2 24538 1
22.416 - 87.1 +13.1 26790 1
22.465 - 92.2 +10.0 31887 2 22.599 -111.7 + 1.0 28738
23.453 - 47.9 - 2.5 23740 1
24.594 -123.9 + 4.7 33056 2 24.650 -131.5 + 0.5 28720
25.551 - 61.2 -10.6 12757 1 25.572 - 38.9 -16.6 5799
1991 January 4 (5154) Daniel W. E. Green
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