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AssertionError in izzo library

See original GitHub issue

I got the following:

(f_v0, f_v), = izzo.lambert(Earth_k, r0, r, tof)
File "c:\users\...\site-packages\poliastro\iod\izzo.py", line 44, in lambert
    for v0, v in sols:
AssertionError

I printed the variables: r0=<Quantity [-4396.85721438, 2117.6460576 , 4400.14349892] km>, r=<Quantity [ 4732.15467662, -2279.13443768, -4735.69156808] km>, tof= 30.0 min

Where is the issue?

Issue Analytics

State:
Created 5 years ago
Comments:27 (17 by maintainers)

Top GitHub Comments

1reaction

astrojuanlucommented, Nov 16, 2018

Or you mean, to take into account only first impulse?

That would be one possibility. In Hohmann, the intermediate transfer orbit is not circular either.

If the perigees are the same, is it OK just to find the difference in velocities on perigee as a DV?

Yes!

1reaction

astrojuanlucommented, Nov 15, 2018

Of course, because the vectors are parallel and therefore the Lambert solution cannot be computed:

In [10]: r0
Out[10]: <Quantity [ 4614.01726712,  -954.85167719, -5415.23295728] km>

In [11]: r
Out[11]: <Quantity [ 4614.01726712,  -954.85167719, -5415.23295728] km>

In [12]: np.cross(r0, r)
Out[12]: array([0., 0., 0.])

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