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mikeleinen
2003-Oct-15, 04:51 PM
Hello&#33;
I want to know (if it&#39;s possible) the maximum speed reached in space by a manmade object (satellite, spacecraft or interplanetary vehicle). I think Helios 2 is the owner of the record with 241,350 Km.p.h. but that&#39;s only 0.022% of the speed of light. Is there anyone faster?
Thanks&#33;&#33;

Haglund
2003-Oct-16, 07:46 AM
Speaking of Helios 2, according to Guiness World Records (http://www.guinnessworldrecords.com/), Helios 2 has another record: it came within 43.5 million km (27 million miles) of the sun, which is the closest approach to the sun. According to the same site, the Helios probes reached 252,800 km/h (158,000 mph), but I&#39;m not sure how accurate that number is, now when we have two different speeds here? Either way it&#39;s pretty fast by our standards, yet incredibly slow for an interstellar mission...

mikeleinen
2003-Oct-16, 03:28 PM
Hello&#33;
Thanks for your info Parker.
Yes, we have two different speeds. And if you read this:

http://www.aerospaceweb.org/question/space...ft/q0109c.shtml (http://www.aerospaceweb.org/question/spacecraft/q0109c.shtml)

we have three different speeds, when Aaron Brown said:

"The maximum speed of Helios 2, which achieved its perihelion distance of 0.29 AU on 17 April 1976, is quoted as about 150,000 mph (241,350 km/h). By applying some simple equations of orbital mechanics, we can confirm that such an orbit would indeed result in a perihelion velocity of 153,800 mph (247,510 km/h). For comparison, the aphelion speed of Helios 2 turns out to be only 45,360 mph (72,985 km/h) at its farthest distance of 0.983 AU. This massive differential between the vehicle&#39;s maximum and minimum speeds graphically illustrates how much an elliptical orbit varies from the circular orbit discussed earlier"

I take the achieved speed, and yes, you&#39;re right when you say:

"it&#39;s pretty fast by our standards, yet incredibly slow for an interstellar mission..."

Thank you again.