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Questions tagged [iridium]

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4
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1answer
75 views

Efficiency and timing of the Iridium-6/GRACE-FO low-power burn and coast phase?

In the video of the recent Iridium-6/GRACE-FO launch at about T+ 08:13 (curently at 24:12 in the video) the announcer says: ...
10
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2answers
140 views

Deploying multiple satellites from one second stage

I’m just watching the Iridium-6/GRACE-FO launch from SpaceX. Before the launch they showed a video of the Iridium satellite network and in this mission they deployed 5 additional satellites into LEO. ...
3
votes
2answers
158 views

SpaceX's Iridium 4: Explanation of Trail Footage

There is a lot of footage of SpaceX's Iridium 4 mission of 22 Dec 2017. The rocket's vapor trails look very different from those of airplanes, since it gains a lot of height. Anyhow, the result looks ...
3
votes
1answer
367 views

How exactly are satellites drifted to slots in different orbital planes?

The Iridium constellation is being replaced by new satellites. There are six planes with 11 satellites + one spare each. Since the Falcon 9 launcher can only carry ten satellites per launch, filling ...
6
votes
1answer
187 views

What goes into an Iridium Flare prediction model besides the ephemerides?

Empirical Answer Considered! (see the end of the question for details) Iridium satellite flares are a class of Satellite Flares that originate from satellites in the current Iridium constellation. ...
5
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2answers
315 views

How much longer will we be able to see Iridium satellite flares?

I've literally just heard here that the days of observing Iridium satellite flares are numbered. Of course it's common sense, but I never thought about it. Roughly how soon are these going to start ...
4
votes
1answer
147 views

What does a steep change in mean anomaly indicate?

I'm following the slot swaps of the Iridium satellites in plane 6 and cannot make sense of the following: The TLEs of three of the old satellites very often show a marked difference in the mean ...
5
votes
2answers
496 views

What is the final conclusion about 'object M'? What happened?

I've looked at Is Iridium launch object M a test satellite? and I don't understand what seems to have happened. The Iridium launch produced 11 orbiting objects when only 10 Iridium satellites were ...
5
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1answer
326 views

What pattern of satellite release will the pentagonal Iridium arrangement use?

The first ten of eleven OrbComm satellites were deployed in opposing pairs at five different times. The 2nd stage performed roll maneuvers to make sure the initial velocity and/or attitude were ...
12
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2answers
2k views

What (actually) makes Iridium “the world's only truly global mobile satellite communications company”?

In this article about how the SpaceX anomaly will affect Iridium it says: In its official website, Iridium describes itself as "the world's only truly global mobile satellite communications company....
10
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3answers
2k views

What is a “Double Iridium Flare” and how close can the two satellites be?

I just saw the term "Double Iridium Flare" and I'm wondering how close two Iridium satellites might actually be (in distance (km) and angle). I found this video as an example. ...