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Old 11-19-2022, 02:33 AM
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Default Artemis 1 tracking website (link)

Hello All,

NASA has an Artemis 1 tracking website (see: https://www.nasa.gov/specials/trackartemis/ ), and *this* (see: https://www.space.com/artemis-1-ori...5A-609994E2C5A9 ) Space.com article, which covers it, lists its many interesting real-time features. It will be interesting to watch--as it happens--the ten "hitch-hiker" payloads (solar orbiters, lunar orbiters, a lunar lander, and a solar sail-propelled asteroid probe) separate as the vehicle nears the Moon some days from now.
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Old 11-19-2022, 06:15 AM
PaulK PaulK is offline
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That's pretty cool! My old laptop can barely run it, but still cool! So the solar array camera views seem to be a mix of actual photos of the arrays and a graphic of the capsule. What's up with that?
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Old 11-19-2022, 10:14 AM
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Artemis has slowed from about 25,000mph to 960mph three days into its flight. It's still slowing, but will eventually pick up a little as it transfers to lunar influence.
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Old 11-19-2022, 06:24 PM
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Quote:
Originally Posted by PaulK
That's pretty cool! My old laptop can barely run it, but still cool! So the solar array camera views seem to be a mix of actual photos of the arrays and a graphic of the capsule. What's up with that?
I know what you mean; my pretty (^not^ regarding its appearance :-) ) new *desktop* computer didn't start running if for a couple of minutes after I clicked on its link, and I was wondering if I had to click on one of its screen-border buttons to start it--then, *Bang!*--and I suddenly found myself flying along through space near the Orion spacecraft, looking at the Earth and the Moon among the stars...
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Old 11-19-2022, 06:33 PM
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Quote:
Originally Posted by tbzep
Artemis has slowed from about 25,000mph to 960mph three days into its flight. It's still slowing, but will eventually pick up a little as it transfers to lunar influence.

It's like watching a golfer sink an uphill putt. Except Artemis is aiming at where the moon will be. The rate of closure is also about 1,800mph while its own speed must be relative to Earth.
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Old 11-19-2022, 07:41 PM
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Quote:
Originally Posted by tbzep
Artemis has slowed from about 25,000mph to 960mph three days into its flight. It's still slowing, but will eventually pick up a little as it transfers to lunar influence.
As long as it doesn't stop short--as Pioneer 1 (see: https://www.drewexmachina.com/2016/...-space-mission/ ) and Pioneer 3 (see: https://www.drewexmachina.com/2014/...-4-lunar-probe/ and https://en.wikipedia.org/wiki/Pioneer_3 ) did--I'll be deliriously happy! Pioneer 1 was a particularly galling disappointment, as its velocity fell short by the maddeningly small margin of 2% (just 570 mph).

Its Thor-Able launch vehicle (a Thor IRBM topped by a Vanguard hypergolic liquid propellant second stage [named Able] and an X-248 Vanguard solid propellant third stage [later called Altair and Burner I]; the first Thor-Delta vehicles were refined Thor-Able vehicles with the X-248 third stage, a more streamlined Thor/Able adapter, and more voluminous Able-diameter and bulbous payload fairings) still had plenty of propellant to reach the Moon. But the integrating accelerometer, because of a slightly (3°) lofted ascent, cut off the Able engine 10 seconds earlier than planned. At 98% of the translunar velocity (which is only about 200 mph less than escape velocity), Pioneer 1 climbed to 70,700 miles--a tremendous (and record-setting) distance in 1958--then fell back, burning up in the Earth's atmosphere about 43 hours after launch. Also:

While we can reach the Moon in just nine or ten hours, as Pioneer 10--and most recently, New Horizons demonstrated; they were both heading (at least first) to Jupiter--(although the excess velocity must be disposed of if a landing is needed; but SpaceX's Starship could manage it, to conduct a mission of mercy to a Moon base), most lunar missions economize on propellant. They launch--directly from Earth, or from a parking orbit around the Earth, which affords longer launch windows--so that the spacecraft is traveling only a few hundred--or even a few tens--of miles per hour when it crosses the "Neutral point" (about 43,495 miles from the Moon [and about 200,000 miles from the Earth], along the Earth-Moon line, where the gravitational forces of the two bodies are equal). Even if a spacecraft were moving only a few inches per second as it passed that point (whose exact distance varies a bit because the Moon's orbit is elliptical, and because of the Sun's gravity), it would fall toward the Moon with no further application of thrust from the spacecraft. Incidentally:

When the Atlas-Centaur (whose Centaur upper stage, still in use today, burned liquid hydrogen and liquid oxygen; it was the launch vehicle for the seven [five were successful] Surveyor unmanned lunar landers) was being developed, mission planners realized that without a restart capability, for four or five months out of the year there would be no lunar launch windows for liquid hydrogen-powered launch vehicles such as the Atlas-Centaur, so several of its test flights involved developing its restart capability. With the restart capability (which enabled parking orbit as well as direct-ascent launches [which the Pioneer 1 - 4 lunar probes had all used]), Surveyor had at least one lunar launch window available every month.
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http://www.lulu.com/product/cd/what...of-2%29/6122050
http://www.lulu.com/product/cd/what...of-2%29/6126511
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