| 9 Sep 2019 |
| 14:55:39 |  emily_selwood | one 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 left the room. |
| 14:56:57 | emily_selwood | one down at least. Could you kick the other ones... |
| 15:30:42 | |  astrojuanlu withdrew  @wselwood:matrix.org's invite. |
| 15:31:00 | |  @wilselwood:matrix.org left the room. |
| 16:07:02 | astrojuanlu | oops, some tests failing from the conda package https://github.com/conda-forge/poliastro-feedstock/issues/30 |
| 17:00:11 |  jorgepiloto | So, should we impose some specific version for Numpy and Plotly? 🤔 |
| 17:01:29 | astrojuanlu | rather than imposing it, probably limiting it. but I didn't look into the issue in detail |
| 12 Sep 2019 |
| 15:13:18 | |  noc0lour joined the room. |
| 15:14:57 | noc0lour | Hi all, I picked up the helio-synchronous orbit calculations the other day and I have some questions (: |
| 15:15:27 | astrojuanlu | hi noc0lour, welcome ! sure, go ahead |
| 15:15:49 | noc0lour | for 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 | e.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 | the RAAN will change only if it's propagated with a propagator that accounts for J2, which is not the default |
| 15:18:46 | astrojuanlu | right now you can use the cowell method and include that perturbation effect |
| 15:19:28 | astrojuanlu | another 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 | Ah, that's great. I actually just checked for the propagation method and if J2 is considered. |
| 15:19:39 | astrojuanlu | * 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 | noc0lour: to know more about perturbations, check out https://docs.poliastro.space/en/stable/examples/Natural%20and%20artificial%20perturbations.html |
| 15:22:00 | noc0lour | Yup, 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 | no worries! and sure, feel free to ask everything here :) |
| 13 Sep 2019 |
| 07:11:12 | noc0lour | Cool 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 |
| 08:19:02 | jorgepiloto | Hi noc0lour 👋
I left some comments on your pull request, most of them come from Juanlu's review in #774.
|
| 08:19:08 |  Github | https://github.com/poliastro/poliastro/pull/774 : Add RAAN from LTAN calculation to SSO calculation |
| 08:19:47 | jorgepiloto | Ops, sorry! They come from #747 😅 |
| 08:19:48 | Github | https://github.com/poliastro/poliastro/pull/747 : Add heliosynchronous orbits |
| 08:21:09 | jorgepiloto | However, 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 | Yes indeed, I can look into adding that to the bodies.py |
| 14 Sep 2019 |
| 11:24:21 | astrojuanlu | finally working on this: https://github.com/poliastro/poliastro/issues/776 |
| 15:00:30 | astrojuanlu | yay! this was tricky, but I fixed it |
