Updated track model

Due to fog last night, one CW and one CCW inclinometry run were made. (Thanks Jeff, Henry). The CW data was used to create a new track model, which is now installed.

     dataset     Start time     Mean leg temperatures
                     HST        start   middle    end
   inc971031cw      02:25        6.6      6.0     5.6 C
   inc971031ccw     05:20        5.6      5.0     4.2

The plot below shows the difference between the new model and the previous one of 970915 :

1-2" excursions, all about 5 degrees FWHM, are seen at azimuths 14, 40, 65, 94, 120, 146, 194, 218, 245, 269, 295. These correlate with wheel-joint interactions, often with pairs of interactions with azimuth differences of a couple of degrees, and often involving wheel 2.

The rms scatters in the 971031-970915 data for track model parameters (F1, F2, F3) are (1.1", 0.8", 0.6").

The CW-CCW model difference is shown below :

Again, some excursions are seen, but not so noticeably as in the 971031-970915 (cw) data, and rms scatters in (F1, F2, F3) here are (1.2", 0.5", 0.4"). It seems possible that the large excursions in the 971031-970915 plot originate in the 970915 data. Given this, and the longish interval without new inclinometry data, the new CW model has been installed, although, as always, it would be useful to obtain additional data, soon, to confirm this new model.