# Thread: What is trajectory Deflection Angle

1. What is trajectory Deflection Angle

Flyby anomaly - Wikipedia, the free encyclopedia

Date 12/8/1990 12/12/1992 01/23/1998 08/18/1999 03/04/2005 08/02/2005 11/13/2007 11/13/2009 10/9/2013
Speed at infinity, km/s 8.949 8.877 6.851 16.01 3.863 4.056
Speed at perigee, km/s 13.738 --- 12.739 19.03 10.517 10.389 12.49 13.34
Impact parameter, km 11261 12850 8973 22680.49 22319
Minimal altitude, km 956 303 532 1172 1954 2336 5322 2483
Spacecraft mass, kg 2497.1 730.40 4612.1 2895.2 1085.6 2895 2895
Trajectory inclination to equator, degrees 142.9 138.9 108.8 25.4 144.9 133.1
Deflection angle, degrees
47.46 51.1 66.92 19.66 99.396 94.7
Speed increment at infinity, mm/s 3.92±0.08 -4.60± 1.00 13.46±0.13 −2±1 1.82±0.05 0.02±0.01
Speed increment at perigee, mm/s 2.56±0.05 7.21±0.07 −1.7±0.9 0.67±0.02 0.008±0.004 ~0 −0.004±0.044
Gained energy, J/kg 35.1±0.7 92.2±0.9 7.03±0.19

2.

3. Originally Posted by Anderson et al.
the deflection angle (DA) is the angle between the incoming and outgoing asymptotic velocity vectors,
Anomalous Orbital-Energy Changes Observed during Spacecraft Flybys of Earth (PDF)
There is a picture on the first page that might make it clearer.

I haven't attempted to follow it, but there is some discussion of this here: Anomaly predictions in for JUNO flyby of October 9 2013

4. 1.) Will it come data regarind Juno's flyby anomaly ?
2.) What is the inclination of the tracjetory of Juno ?

5. Originally Posted by Bjarne
What is trajectory Deflection Angle
The deflection angle is the total angle by which a trajectory is changed :

This is for a ray of light, but the principle is a general one - in the above, the trajectory deflection angle is .

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