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9 Sep 2019
14:55:39@emily_selwood:openastronomy.orgemily_selwoodone I think I can get into. give me a minute I should be able to get that one to leave.
14:56:36@wil_selwood:openastronomy.orgwil_selwood left the room.
14:56:57@emily_selwood:openastronomy.orgemily_selwoodone down at least. Could you kick the other ones...
15:30:42@astrojuanlu:matrix.orgastrojuanlu withdrew @wselwood:matrix.org@wselwood:matrix.org's invite.
15:31:00@wilselwood:matrix.org@wilselwood:matrix.org left the room.
16:07:02@astrojuanlu:matrix.orgastrojuanluoops, some tests failing from the conda package https://github.com/conda-forge/poliastro-feedstock/issues/30
17:00:11@jorgepiloto:matrix.orgjorgepilotoSo, should we impose some specific version for Numpy and Plotly? 🤔
17:01:29@astrojuanlu:matrix.orgastrojuanlurather than imposing it, probably limiting it. but I didn't look into the issue in detail
12 Sep 2019
15:13:18@noc0lour:atrz.denoc0lour joined the room.
15:14:57@noc0lour:atrz.denoc0lourHi all, I picked up the helio-synchronous orbit calculations the other day and I have some questions (:
15:15:27@astrojuanlu:matrix.orgastrojuanlu hi noc0lour, welcome ! sure, go ahead
15:15:49@noc0lour:atrz.denoc0lourfor a helio-synchronous orbit I also need to propagate the orbit with time and currently only the object on the orbit is propagated in time
15:17:05@noc0lour:atrz.denoc0loure.g. the RAAN will change about 1 deg per day as the earth orbits around the sun, I was wondering if there is already a hook somewhere I could hook in the helio-synchronous orbit
15:18:29@astrojuanlu:matrix.orgastrojuanluthe RAAN will change only if it's propagated with a propagator that accounts for J2, which is not the default
15:18:46@astrojuanlu:matrix.orgastrojuanlu right now you can use the cowell method and include that perturbation effect
15:19:28@astrojuanlu:matrix.orgastrojuanluanother idea that hasn't been implemented yet is to have a semi-analytical J2 propagator https://github.com/poliastro/poliastro/issues/285
15:19:45@noc0lour:atrz.denoc0lourAh, that's great. I actually just checked for the propagation method and if J2 is considered.
15:19:39@astrojuanlu:matrix.orgastrojuanlu * another idea that hasn't been implemented yet is to have a semi-analytical J2 propagator https://github.com/poliastro/poliastro/issues/285
15:20:11@astrojuanlu:matrix.orgastrojuanlu noc0lour: to know more about perturbations, check out https://docs.poliastro.space/en/stable/examples/Natural%20and%20artificial%20perturbations.html
15:22:00@noc0lour:atrz.denoc0lourYup, already on that docs page, should have checked first and asked later, but it's good I'm now in this chat here, anyway (:
15:23:28@astrojuanlu:matrix.orgastrojuanluno worries! and sure, feel free to ask everything here :)
13 Sep 2019
07:11:12@noc0lour:atrz.denoc0lourCool beans, Just submitted a PR for the RAAN from LTAN calculation for the SSO orbits. I compared with Sentinel 1/2 from Celestrak and even there the RAAN fits to about 0.5 degrees

Hi noc0lour 👋

I left some comments on your pull request, most of them come from Juanlu's review in #774.

08:19:08@_neb_github:matrix.orgGithubhttps://github.com/poliastro/poliastro/pull/774 : Add RAAN from LTAN calculation to SSO calculation
08:19:47@jorgepiloto:matrix.orgjorgepilotoOps, sorry! They come from #747 😅
08:19:48@_neb_github:matrix.orgGithubhttps://github.com/poliastro/poliastro/pull/747 : Add heliosynchronous orbits
08:21:09@jorgepiloto:matrix.orgjorgepilotoHowever, if we want to expand SSO orbits for any Solar System body, we should have some values for the planet's orbital period around the Sun in order to get $$\dot\Omega_{SunSyn}$$ for each one
08:26:11@noc0lour:atrz.denoc0lour Yes indeed, I can look into adding that to the bodies.py
14 Sep 2019
11:24:21@astrojuanlu:matrix.orgastrojuanlu finally working on this: https://github.com/poliastro/poliastro/issues/776
15:00:30@astrojuanlu:matrix.orgastrojuanluyay! this was tricky, but I fixed it

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