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poliastro

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General chat about poliastro, a Python library for Astrodynamics https://docs.poliastro.space21 Servers

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18 May 2020
19:20:06@jonpsy:matrix.orgjonpsy juanluastro , you've chosen the right person
19:28:00@astrojuanlu:matrix.orgastrojuanlua Sith, no less 😛
19 May 2020
07:26:03@majrocarrot:matrix.orgMajor LightYear changed their display name from majorcarrot to Major LightYear.
20 May 2020
11:35:08@astrojuanlu:matrix.orgastrojuanlu I started a little experiment to provide a CFFI wrapper to ERFA (SOFA) https://github.com/astrojuanlu/erfa-cffi will hopelly make more progress over the coming days cc Ash
11:36:17@astrojuanlu:matrix.orgastrojuanlufor the moment it's a copy-paste from the CFFI tutorial (it's been 4 years since I last used it and I forgot everything)
15:32:32@astrojuanlu:matrix.orgastrojuanluwell, proof-of-concept phase finished. it works well and fast, and it was easier to setup than I expected. the documentation was not very easy to follow but I'm Black Belt in Python packaging 😛 leaving it there until I have the time to add the rest of the functions and comprehensive tests against Astropy... or until someone else does it 😉
15:53:09@ashvoid:matrix.orgAshI feel like I am still trying to earn my first belt some days; awesome & quick work. Is this ABI or API mode? Is this pulling from an ERFA library it assumes is installed?
15:57:13@astrojuanlu:openastronomy.orgjuanluastroAPI mode, out of line (the recommended one, faster, requires a compiler). For the moment, it requires you to locate where the header `.h` and library files are
15:58:09@astrojuanlu:openastronomy.orgjuanluastrobut of course if the files are in a standard location, it picks them up
17:30:13@ashvoid:matrix.orgAshCool, that is the path I hoped this took! My initial thought was to just piggy back off the source files and headers in astropy's ERAF library since its already a dependency for poliastro
22 May 2020
13:08:45@curious_reader:matrix.orgcurious_reader joined the room.
14:20:53@cadair:openastronomy.orgAstroCadair removed their display name AstroCadair.
14:21:35@cadair:openastronomy.orgAstroCadair set their display name to AstroCadair.
26 May 2020
11:16:45@antoine_tavant:matrix.organtoine_tavant joined the room.
11:20:44@antoine_tavant:matrix.organtoine_tavantHi all ! Thanks for inviting me to this discussion room ! I'm currently working at a student space center, developing CubeSat mission in LEO and VLEO (very low earth orbit). Being an advocate for both python and OpenSource, I started to translate tools for mission design in LEO before knowing about poliastro ! I'd be pleased to contribute if I can on the LEO parts !
12:46:42@jorgepiloto:matrix.orgjorgepiloto Hi antoine_tavant and welcome to poliastro's channel 🚀
13:58:20@elliot:converser.euelliot joined the room.
14:12:01@ashvoid:matrix.orgAsh Welcome antoine_tavant, I know a few of us are working Earth Orbit problems. I did some work for speeding up ITRS-GCRS transformations and Az El calculations. Its still rough cuts, but I've seen cases where I am orders of magnitude faster than AstroPy. What type of problems are you currently trying to solve?
14:25:17@astrojuanlu:matrix.orgastrojuanlu welcome antoine_tavant ! 💪
14:36:52@astrojuanlu:matrix.orgastrojuanlu

from the Plotly 4.8.0 release notes:

plotly go.Figure and go.FigureWidget now have a _repr_html_ and a _repr_mimebundle_ method, which are standard hooks for integration in systems based on IPython. In particular, with _repr_html_ plotly figures can now be used within sphinx-gallery without any scraper. These additions should not change anything to the way plotly figures are displayed in notebook environments, since the _ipython_display_ method (already present in earlier versions) takes precedence over the new methods.

14:45:31@antoine_tavant:matrix.organtoine_tavantRedacted or Malformed Event
14:46:06@antoine_tavant:matrix.organtoine_tavant
In reply to @ashvoid:matrix.org
Welcome antoine_tavant, I know a few of us are working Earth Orbit problems. I did some work for speeding up ITRS-GCRS transformations and Az El calculations. Its still rough cuts, but I've seen cases where I am orders of magnitude faster than AstroPy. What type of problems are you currently trying to solve?
Actually, what I need to do may already be implemented, just I haven't yet found it... For instance, the first thing I'd love to have in the local Magnetic field (form IGRF for instance) in the orbital reference frame (which I can't find a standard name in English, but is velocity / Nadir / orbital vector) along an orbit.
15:12:34@astrojuanlu:matrix.orgastrojuanlu
In reply to @antoine_tavant:matrix.org
Actually, what I need to do may already be implemented, just I haven't yet found it... For instance, the first thing I'd love to have in the local Magnetic field (form IGRF for instance) in the orbital reference frame (which I can't find a standard name in English, but is velocity / Nadir / orbital vector) along an orbit.
what's the name in French?
15:36:35@antoine_tavant:matrix.organtoine_tavantThere is no standard either :) It can be "référentiel orbite" which can be easily translated, or "body centered inertial' or such. In english I've seen something like RWQ or similar, but I'm not sure if it is widely used...
15:39:14@ashvoid:matrix.orgAshsounds like GCRS, as a non-astro guy I have been continuously confused by the nomenclature, especially between decades or USG/IAU/other
15:39:46@ashvoid:matrix.orgAshJuan, being a proper astro guy, can probably give a better answer
15:40:03@astrojuanlu:matrix.orgastrojuanluin Vallado "fundamentals of Astrodynamics" I see PQW (perifocal) and RSW (satellite). P = eccentricity vector, pericenter Q = true anomaly = 90º R = radial S = along-track or transverse W = normal to the orbital plane
15:40:18@astrojuanlu:matrix.orgastrojuanlu * in Vallado "fundamentals of Astrodynamics" I see PQW (perifocal) and RSW (satellite). P = eccentricity vector, pericenter Q = true anomaly = 90º R = radial S = along-track or transverse W = normal to the orbital plane
15:41:44@ashvoid:matrix.orgAshQED - Juan > Ash :P
16:05:23@astrojuanlu:matrix.orgastrojuanluhahaha

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