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View Full Version : That frame dragging experiment, how did it turn out?



BigDon
2006-Aug-06, 08:34 AM
That satellite that had the four smoothest spheres ever made, put into polar orbit, does anybody know the results? I did a search here on frame dragging, but got 129 results. Plus I can't remember the actual name of the experiment to look it up on the net. Thanks.

01101001
2006-Aug-06, 08:43 AM
Gravity Probe B (http://einstein.stanford.edu/)


During the 50-week science phase of the GP-B mission and the 7-week instrument calibration phase, which lasted from August 2004 - Septermber 2005, we collected over a terabyte of experimental data. Analysis has been progressing through a 3-phase plan, each subsequent phase building on those preceding it.
FAQ: When are you going to publish results?


We expect to make this announcement of the results in April 2007.

BigDon
2006-Aug-06, 08:59 AM
Thanks once again 01101001, (do your friends call you 105?) I won't forget the name this time.

01101001
2006-Aug-06, 09:51 AM
(do your friends call you 105?)

oiioiooi, pronounced oyyoyooy

Tensor
2006-Aug-06, 01:25 PM
oiioiooi, pronounced oyyoyooy

Your last name wouldn't happen to be "vey", would it? :lol: ;)

publius
2006-Aug-07, 07:26 PM
And don't forget, besides frame dragging/gravitomagnetism, GPB is also looking for another effect, called the geodetic effect, which is going to be stronger than frame dragging for the earth.

The geodetic effect is a change in the axis of spin to the curvature of 3-space itself. In Netwonian gravity and mechanics, the axis of a gyro should remain dead constant in orbit, in the absence of other forces (and this is whay they had to go to so much trouble to isolate the gyros from other forces).

However, GR predicts it will change slightly because of the curvature. You can see this in a rough way by looking at what happens to local directons on the surface of sphere, as you follow various paths. 3D space around the earth is curved, but every so slightly, according to GR, and it will have a similiar effect, but very small.

This will be a strong test of the geometric interpretation of gravity.

-Richard

JohnW
2006-Aug-07, 07:38 PM
Your last name wouldn't happen to be "vey", would it? :lol: ;)
What's your mailing address, Tensor? I need to send you a bill for a cup of coffee, laundry and a keyboard.

Tensor
2006-Aug-08, 06:21 PM
What's your mailing address, Tensor? I need to send you a bill for a cup of coffee, laundry and a keyboard.

Never indulge in beverages when reading this forum. There are several people here capable of producing the effect you recently encountered. :whistle: :lol:

Charlie in Dayton
2006-Aug-08, 08:05 PM
http://64.235.231.60/MonitorSpatter.jpg

hhEb09'1
2006-Aug-30, 08:03 AM
Gravity Probe B is discussed in this issue of Biblical Astronomer (http://www.geocentricity.com/ba1/110.pdf#search=%22milli360%22) (page 126?), where I am quoted[/url][url=http://www.bautforum.com/showthread.php?p=205175#post205175] (http://www.bautforum.com/showthread.php?p=204789#post204789) as
The definitive experiment (Gravity Probe B) to test “frame dragging”
is to be launched April 17 of this month. Results in a couple
years, but preliminary analysis of other satellites (LAGEOS)
seems to favor a positive outcome. If general relativity fails this
test, Geocentricity is doomed.Their answer is "Nope" because there is still the Lense-Thirring effect. :)