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Bjarne
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Is the Pioneer Anomaly really directed towards the Sun ?
How sure are we ?
Why not directed around the Sun ?
How sure are we ?
Why not directed around the Sun ?
Bjarne you need to read a decent paper on the subject such as this one: The Study of the Pioneer Anomaly: New Data and Objectives for New Investigation by Turyshev at the JPL et al.Bjarne said:( Sorry if this is not perfect English)
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The 8 of December 1992 Pioneer 10 was suddenly changing course.
Do somebody know, to which directed it changed course, - and how much
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Several probes in gravity assist manoeuvre were gaining between 4 and 13 mm per second.
But Pioneer 10 was loosing an average of 400 mm per second right?
So the unknown force seems to be between 40 to 80 times stronger in the outer solar system, compared to the inner, right?
Following its encounter with Saturn, Pioneer 11 explored the outer regions of our solar system, studying the solar wind and cosmic rays. Pioneer 11 sent its last coherent Doppler data on 1 October 1990 while at ∼ 30 AU from the Sun. In September 1995, Pioneer 11 was at a distance of 6.5 billion km from Earth. At that distance, it takes over 6 hours for the radio signal to reach Earth. However, by September 1995, Pioneer 11 could no longer make any scientific observations. On 30 September 1995, routine daily mission operations were stopped. Intermittent contact continued until November 1995, at which time the last communication with Pioneer 11 took place. There has been no communication with Pioneer 11 since. The Earth’s motion has carried our planet out of the view of the spacecraft antenna. The spacecraft cannot be maneuvered to point back at the Earth. It is not known whether the spacecraft is still transmitting a signal. No further tracks of Pioneer 11 are scheduled.
If the PA is an actual unmodeled acceleration, and not a clock drift, then the distance traveled away from the predicted position, as the acceleration has been more or less constant, over a period of 30 years i.e. 109seconds, is simply given byBjarne said:Thank you for the advice Garth.
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I am reading it now and wonder:
Pioneer 10 have lost totally 400.000 km traveling about 30 years.
How can I calculate how much the probe was loosing, - for instance every month, - by using the information that it lost about >> 8 .74 × 10−10 m/s^2 (per second).
What confuse me is that seconds here is m/s^2
When I want to calculate how much the probe is loosing, let say in 10.000 second, how can I do this?
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Pioneer 10 was really changing course, http://science.nasa.gov/headlines/y2001/ast03may_1.htm
On December 8, 1992, when Pioneer 10 was "only" 5.2 billion miles away, the craft experienced an unexpected course change.
Astronomers think it was diverted slightly by the gravitational pull of a Kuiper Belt Object.
I wonder to which direction did it change course ?
Now I see that my last post duplicated a sentence! Too late to edit...Bjarne said:I have now read the article
Several facts have brought me to the conclusion that a space probe is only affected by the strange force so soon it is released from the gravitational force of the Sun ( the equivalence principle ).
So long a space probe is bound to the gravitational force of the Sun, it seems that the force is to weak to to make any difference. .
I also think that when a probe is bounded by the gravitational force of a planet, the anomaly will not occur. But we properly have to poor date to confirm or dismiss this right now.
This thought could very well be the first little step that can help to solve this mystery.
KR
Bjarne Lorenzen
The Pioneer Anomaly is a phenomenon observed in the trajectories of the Pioneer 10 and 11 spacecrafts, where they appear to be slowing down more than expected as they travel away from the Sun.
Yes, the Pioneer Anomaly is a real and well-documented phenomenon. It was first discovered in the 1980s and has been studied extensively by scientists.
The exact cause of the Pioneer Anomaly is still unknown, but it is believed to be caused by a combination of factors such as thermal radiation, gas leaks, and inaccuracies in our understanding of gravity at large distances.
No, the Pioneer Anomaly has only been observed in the trajectories of the Pioneer 10 and 11 spacecrafts. Other spacecrafts, such as the Voyager and New Horizons, have not shown the same anomaly.
The Pioneer Anomaly has prompted scientists to re-examine our understanding of gravity and its effects on objects in space. It has also raised questions about the accuracy of our measurements and the need for further research to better understand this phenomenon.