
#1
May1012, 06:23 PM

P: 136

I'm looking at some computer code that purports to compute the correction for the earth's rotation involving two earth stations (A and B) that are collecting meteor data. The closest reference I can offer that talks about this is by Whipple and Jacchia, Reduction Methods for Photographic Meteor Trails, 1956. It's available on a pdf at <http://www.sil.si.edu/smithsoniancontributions/Astrophysics/pdf_hi/SCAS0002.pdf>. I'm just trying to get some basic understanding of what's going on. The section involved is "Computation of orbital elements".
The corrected velocity involves V∞ and Vc, magnitudes. and equations (81) and (82). (82) is somewhat familiar from a post I made several days on "Position and velocity vector of point referred to the equinox". V∞ in understandable as explained by the use of (46) and the lower portion of the left column on the following page, 194. I'm not sure what's going on with Vc. Is it derived somehow from (81)? The second part of a correction is for the zenith attraction, Vcc, which continues after (81) on page 201. (85) Vcc, and the ΔZ correction is shown in (87). I suppose some of what baffles me about Vc and Vcc is that another source calls Vc the observed speed, and Vcc the vector sum of its and the Earth's heliocentric velocities. Meanings do not match up with the Whipple article. This source provides the same equation as (88). 


Register to reply 
Related Discussions  
Computation of Solar Position and Velocity Vectors (Meteor Orbit)  Astrophysics  1  
Find mass of mars given period of moon orbit and radius of orbit  Introductory Physics Homework  1  
Meteor Entering Orbit of a Sun (cons. energy & momentum) [very hard algebra]  Introductory Physics Homework  2  
Do loop corrections and string corrections to the black hole entropyagree?  General Physics  0  
Orbit Transfer to Lower Apoapsis of a Mars Orbit  Introductory Physics Homework  11 