I am trying to generate some plots of the tracks of some 16th-century
comets input manually from Brian Marsden's Catalog. I keep getting
the "invalid floating decimal point" error. I have version 2.75 with
the basic package. I have tried varying the eccentricity and
inclination, changing the epoch from 1950 to 2000, changing the
projection, and selecting dates from the 16th century to the
present. ('Calendar' doesn't work, either.) Capriciously, once, and
once only, when I selected all 5 comets plus one in the built-in
database, I got a display of instantaneous positions of all 6 comets,
and I thought I was making progress, but I have been unable to repeat
this partial success.
The elements are:
C/1577 I C/1580 C/1582
T 15771027.448 15801128.993 15820506.913
q 0.1775 0.60237 0.16872
e 1.0 1.0 1.0
peri 255.669 89.363 331.901
node 30.538 24.251 232.338
incl 104.878 64.606 118.543
C/1585 C/1590
T 15851008.5262 15900208.5271
q 1.094846 0.567726
e 1.0 1.0
peri 331.7326 307.670
node 42.4901 170.642
incl 6.1302 150.457
Suggestions?
Sean Mewhinney
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