 | poliastro | 265 Members |
| General chat about poliastro, a fast, easy to use Python library for interactive Astrodynamics and Orbital Mechanics https://docs.poliastro.space | 28 Servers |
| poliastro | 265 Members |
| General chat about poliastro, a fast, easy to use Python library for interactive Astrodynamics and Orbital Mechanics https://docs.poliastro.space | 28 Servers |
| Sender | Message | Time |
|---|---|---|
| 17 Jul 2023 | ||
 astrojuanlu | this is the right place to ask bahar21 :) what have you tried? | 12:18:39 |
 bahar21 | Thank you! This is what I'm doing: solar_system_ephemeris.set("jpl") start_date = Time("2022-07-11 12:00:00", scale="utc") sso_orb = Orbit.from_classical(Earth, a, ecc, inc, raan, argp, int_nu, epoch=start_date, plane=Planes.EARTH_EQUATOR) num_orb = 2 end_nu = int_nu.value + num_orb * 2 * np.pi << u.rad num_samples = int(np.rad2deg(end_nu).value) end_date = sso_orb.propagate(num_orb * sso_orb.period).epoch epochs = time_range(start=start_date.value, periods=num_samples, end=end_date.value) moon_position = build_ephem_interpolant(body=Moon, period=Moon.period, t_span=epochs, attractor=Earth) The num_samples is important, because I will implement the moon's position into the 3rd body perturbation function and that into a system of nonlinear differential equations, I will be integrating with Runge Kuttah. Every other value I have sampled for example the true anomalies is also that many. I get the samples without any errors when I use the default 'periods = 50' in the time_range function, but when I specify that I get the following errors: Traceback (most recent call last): File "C:\Program Files\JetBrains\PyCharm Community Edition 2023.1.2\plugins\python-ce\helpers\pydev\pydevd.py", line 1496, in _exec pydev_imports.execfile(file, globals, locals) # execute the script File "C:\Program Files\JetBrains\PyCharm Community Edition 2023.1.2\plugins\python-ce\helpers\pydev_pydev_imps_pydev_execfile.py", line 18, in execfile exec(compile(contents+"\n", file, 'exec'), glob, loc) File "D:\Masterarbeit\PythonTool\TSS_1dof_Runge_Kutta.py", line 77, in moon_position = build_ephem_interpolant(body=Moon, File "C:\Users\BAHAR.conda\envs\myenv\lib\site-packages\poliastro\ephem.py", line 56, in build_ephem_interpolant ephem = Ephem.from_body(body, epochs, attractor=attractor) File "C:\Users\BAHAR.conda\envs\myenv\lib\site-packages\poliastro\ephem.py", line 230, in from_body .represent_as(CartesianRepresentation, CartesianDifferential) File "C:\Users\BAHAR.conda\envs\myenv\lib\site-packages\astropy\coordinates\baseframe.py", line 1127, in represent_as raise TypeError( TypeError: Frame data has no associated differentials (i.e. the frame has no velocity data) - represent_as() only accepts a new representation. | 12:57:18 |
| bahar21 | * Thank you! num_orb = 2 The num_samples is important, because I will implement the moon's position into the 3rd body perturbation function and that into a system of nonlinear differential equations, I will be integrating with Runge Kuttah. I get the samples without any errors when I use the default 'periods = 50' in the time_range function, but when I specify that I get the following errors: Traceback (most recent call last): | 12:57:59 |
| bahar21 | * Thank you! solar_system_ephemeris.set("jpl") num_orb = 2 The num_samples is important, because I will implement the moon's position into the 3rd body perturbation function and that into a system of nonlinear differential equations, I will be integrating with Runge Kuttah. I get the samples without any errors when I use the default 'periods = 50' in the time_range function, but when I specify that I get the following errors: Traceback (most recent call last): | 12:58:06 |
| bahar21 | * Thank you! solar_system_ephemeris.set("jpl") num_orb = 2 The num_samples is important, because I will implement the moon's position into the 3rd body perturbation function and that into a system of nonlinear differential equations, I will be integrating with Runge Kuttah. I get the samples without any errors when I use the default 'periods = 50' in the time_range function, but when I specify that I get the following errors: Traceback (most recent call last): | 13:00:02 |
| 19 Jul 2023 | ||
 Red | Thank you Poliastro ! https://twitter.com/redotics/status/1681057136816660486 That is me trying to see where CHANDRAYAAN-3 is, couple of days ago :) | 20:55:07 |
| 25 Jul 2023 | ||
 Aisulu Burkitbayeva joined the room. | 03:45:32 | |
| Aisulu Burkitbayeva | Hi) I wanted to ask if your library permits calculating and visualising Earth Coverage by Satellites in Circular Orbit? | 03:48:31 |
| 3 Aug 2023 | ||
 Andrew Lewis joined the room. | 06:38:19 | |
| Andrew Lewis | HI there, we're a new startup called Globalymbe Limited researching and developing guidance algorithms. As an ouvre question, does anyone know any good books which discuss the use of this poliastro library, please? | 06:40:15 |
| astrojuanlu | Hi Andrew Lewis, I'm not aware of any books (that would be so cool). You have plenty of examples in https://docs.poliastro.space if that helps | 06:41:56 |
| Andrew Lewis | wow you are a gem, astrojuanlu, thank you very much. Tally ho. | 06:42:43 |
| Andrew Lewis | I have just ordered a VR headset and am looking into creating £D VR visualizations from this library of orbital simulations. Any also interested in this? | 06:46:25 |
| Andrew Lewis | thats 3D not £D. apologies | 06:46:44 |
| astrojuanlu | In reply to @globalymbe:matrix.orgthat sounds awesome 😍 keep us posted! | 06:48:02 |
| Andrew Lewis | Yes I shall. The trick is converting 2D representations of 3D into VR stereo vision. I may try Unity or Blender? | 06:49:17 |
| astrojuanlu | poliastro does 3D through Plotly and Cesium: https://docs.poliastro.space/en/stable/gallery.html | 06:51:02 |
| Andrew Lewis | wow, that's very interesting. I shall investigate whether that needs converting any more? Many thanks, must dash, speak again soon one morning. | 06:52:18 |
| 15 Aug 2023 | ||
 cartern joined the room. | 16:15:40 | |
| cartern | Poliastro crashes whenever I try to plot. I'm using the examples scripts given in the documentation. Any idea why this is happening? In python, I get either error "segmentation fault:11" or "Illegal instruction:4". In Jupyterlab, I get "The kernel for Untitled.ipynb appears to have died. It will restart automatically." | 16:18:42 |
| astrojuanlu | In reply to @cartern:matrix.orgHey cartern, can you share a complete traceback from Python? and what plotter are you trying to use, relevant versions and so on | 16:44:28 |
| cartern | I don't get a traceback message other than "segmentation fault" or "illegal instruction" (it says nothing else). I tried using traceback.print_exc() but it still doesn't output anything. Is this code https://docs.poliastro.space/en/stable/examples/Catch%20that%20asteroid%21.html self-contained or should I be importing matplotlib somewhere? | 17:01:40 |
| cartern | Thanks btw | 17:01:59 |
| astrojuanlu | In reply to @cartern:matrix.orgif you execute the cells one by one, which cell produces the crash? | 17:02:32 |
| cartern | Earth.plot(EPOCH) | 17:02:50 |
| astrojuanlu | okay, that helps. `Earth.plot(EPOCH)` does a bunch of stuff, so we'd need to dig what exactly causes the crash | 17:04:32 |
| astrojuanlu | can you replace that cell with ``` from poliastro.plotting.orbit.plotter import OrbitPlotter plotter = OrbitPlotter() plotter.plot_body_orbit(Earth) ``` and see if it also fails, and if so, identify which line produces the crash cartern: | 17:08:09 |
| cartern | ModuleNotFoundError Traceback (most recent call last) Cell In[4], line 1 ----> 1 from poliastro.plotting.orbit.plotter import OrbitPlotter ModuleNotFoundError: No module named 'poliastro.plotting.orbit' | 17:10:09 |
| cartern | I used from poliastro.plotting import StaticOrbitPlotter plotter = StaticOrbitPlotter() both of which were fine, but then with plotter.plot_body_orbit(Earth,EPOCH) I got the same crashing behavior, with no message | 17:20:25 |
| astrojuanlu | what version of poliastro are you using then? | 18:06:00 |