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Juno flyby anomaly

by nearc
Tags: anomaly, flyby, juno
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nearc
#1
Dec21-13, 12:24 PM
P: 39
i did a search for juno flyby here and did not find anything, hence this post:

i've not been able to find any info on the juno flyby anomaly. i know there was a hiccup but did we get any data? was the observed anomaly match the predicted anomaly?
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Simon Bridge
#2
Dec21-13, 09:51 PM
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You mean this anomaly?
http://arxiv.org/abs/1311.4218

Compare:
http://arxiv.org/abs/1311.4978

All kinds of speculation (in lit):
http://www.worldscientific.com/doi/a...17751X13500747

Certainly there should be data:
http://www.spaceflight101.com/juno-m...ates-2013.html

I heard that preliminary results were revealed Dec 11 ... but cannot find documents.
CONTROL ID: 1799584
TITLE: Juno Earth Flyby as a Sensitive Detector of Anomalous Orbital-Energy Changes

AUTHORS (FIRST NAME, LAST NAME): John D Anderson1, James F Jordan1, James K Campbell1, John E Ekelund1, John J Bordi2, Mathew Abrahamson2, Shadan M Ardalan2, Paul F. Thompson2
INSTITUTIONS (ALL): 1. Retiree, Jet Propulsion Laboratory, Pasadena, CA, United States.
2. Mission Design & Navigation Section, Jet Propulsion Laboratory, Pasadena, CA, United States.
ABSTRACT BODY: The fact that unexplained energy changes occur in some Earth flybys, but not all, was reported in 2008 by Anderson et al., Phys. Rev. Lett. 100, 091102. The anomaly is detected by analyzing radio Doppler and ranging data used for space navigation. It is most significant for the closest flybys at altitudes of 539 km for the NEAR spacecraft, 960 km for the first Galileo flyby, and 1956 km for the first Rosetta flyby, with anomalous total changes in the hyperbolic excess velocity at infinity of 13.5 mm/s, 3.9 mm/s and 1.8 mm/s, respectively. There is also a correlation with the amount of asymmetry of the flyby trajectory with respect to the Earth’s equator. As it turns out, the Juno flyby is well suited for another detection of this anomaly, with an altitude of about 500 km, and a declination of the incoming hyperbolic asymptote of 14.6 deg and an outgoing asymptote of 40.4 deg. Further, the control sequence for the spacecraft introduces no significant translational forces for an interval of plus and minus four days of perigee. Based on eight flybys analyzed previously, and an empirical formula given in the 2008 paper, the expected size of the Juno anomaly is about 7 mm/s. The standard error of the measurement is about 0.01 mm/s. We report first results of the data analysis.
... OK but where?!

The 2008 paper mentioned in the absract I found:
http://virgo.lal.in2p3.fr/NPAC/relat...anderson_2.pdf
nearc
#3
Dec23-13, 09:09 PM
P: 39
yep sounds like we still need to wait a bit but thanks

TurtleMeister
#4
Mar23-14, 10:10 PM
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Juno flyby anomaly

I cannot find the results of this flyby. The Wikipedia page has data for the previous spacecraft flyby, but still nothing for Juno. Does anyone know anything about this?
AlephZero
#5
Mar23-14, 10:43 PM
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The fact that half the authors are listed as "retirees" might have something to do with it, in an age of budget cuts.
Cosmobrain
#6
Mar23-14, 10:46 PM
P: 66
Oh, I thought you were talking about the Juno spacecraft when if flew by the Earth :p Anyway, those were interesting texts, Simon. I did learn something today.

cb


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