Observation by Nick James: Artemis/Orion EM-1 at 375,000 km

Uploaded by

Nick James

Observer

Nick James

Observed

2022 Dec 07 - 21:30

Uploaded

2022 Dec 07 - 21:47

Objects

Spacecraft

Equipment
  • ASI6200MM + Celestron HD11
Exposure

26x30s

Location

Chelmsford, UK

Target name

Artemis/Orion EM-1

Title

Artemis/Orion EM-1 at 375,000 km

About this image

Grant beat me to it (here) but here is my animation of the Orion capsule and ESA service module heading back to Earth. The position is close to the JPL Horizons prediction and the range is around 375,000 km. 

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Comments
Grant Privett
Grant Privett, 2022 Dec 08 - 01:25 UTC

I think yours is a nicer picture though. I had to remove a sky background from each frame of mine before creating the gif. The result is rather nosy.

Your measurement suggests a mag brighter than last night. Will be even nearer tonight.

One query. Can I assume reentry is over the US so we won't see it? Its a hot arrival with a double "bounce" apparently. Does that put first bounce over the atlantic at 17:00ish?

Nick James
Nick James, 2022 Dec 08 - 04:46 UTC

Assuming no course corrections the astrometry we have shows contact with the Earth at at 11 Dec 2022 17:31:23.84 UTC at lat -20.82961 lon W122.42014:

https://projectpluto.com/pluto/mpecs/orion.htm

That's in the South Pacific. The splashdown will actually be off the coast of California. We get a good view of  it right up to the night of December 10th.

Grant Privett
Grant Privett, 2022 Dec 08 - 13:20 UTC

As of 13:00 the JPL Horizons system seemed to be refusing to serve up a positional predictions. 

Could you remind me how its possible to get a prediction for my Long/Lat from Project Pluto please.

Nick James
Nick James, 2022 Dec 09 - 07:20 UTC

Horizons is working for me but the other source is Bill Gray's pages:

https://projectpluto.com/pluto/mpecs/orion.htm

https://github.com/Bill-Gray/tles/blob/master/22156a.tle#L196

The second link gives you perturbed TLEs for each segment of the return path.

The artsat page here:

https://projectpluto.com/sat_eph.htm

Doesn't have Orion on it.

Grant Privett
Grant Privett, 2022 Dec 09 - 22:45 UTC

Thanks for all that. I shall try that link.

I tried Horizons again the next day and it worked fine. By chance I realised I had downloaded a 48hr prediction the day before, so I got Artemis again last night. Though things iced up after 1am.

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