Details

Type: Bug

Status: Closed (View Workflow)

Priority: P1

Resolution: Fixed

Affects Version/s: None

Fix Version/s: None

Component/s: Calculation Parameters (FRR38)

Labels:None

Environment:
Windows 7 Enterprise 64bit
20121015 build
Description
The attached script outputs Mooncentered HA for a LEO spacecraft. This is an angular parameter, so I would expect it to have a range of 0–360 or 180–180.
But the range from GMAT is odd: it looks like 360–360. Can you check the code and see if it's being modded to any particular range?
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Hyperbolic anomaly is a weird parameter in that it is NOT an angle but a measure of area. So, HA does not have a range like other anomalies. From a mathematical perspective, sinh(X) = (e^x  e^(x))/2 which is NOT a periodic function. Hence, you cannot use modular arithmetic on asinh. Another way of saying this is sinh(.1) ~= sinh(.1 + 2*pi).