Satellite Tookit Data Package

This package contains necessary data files for the Satellite Toolkit, "satkit", python data package.

The files include:

• leap-seconds.list
  A list of the UTC leap seconds since 1972. This is a common file in *nix platforms and is used to keep track of the number of seconds (currently 37) that UTC lags TAI

• linux_p1550p2650.440
  File containing the precice ephemerides of the planets and 400 large asteroids between the years 1550 and 2650, as modelled by the Jet Propulsion Laboraotry (JPL). Note: this file is large -- approx. 100 MB.

• tab5.2a.txt, tab5.2b.txt, tab5.2d.txt
  Tables from IERS Conventions Technical Note 36, containng coefficients used in the precice rotation between the inertial International Celestial Reference Frame and the Earth-fixed International Terrestrial Reference Frame.

• EGM96.gfc, JGM2.gfc, JGM3.gfc, ITU-GRACE16.gfc
  Files containing gravity coefficients for various gravity models. These are used to compute the precise acceleration due to Earth gravity as a function of position in the Earth-fixed ITRF frame.

• SW-All.csv
  Space Weather. The solar flux at $\lambda~=~10.7cm$ (2800 Mhz) is an indication of solar activity, which in turn is an important predictor of air density at altitudes relevant for low-Earth orbits. This file is updated at celestrack.org every 3 hours with the most-recent space weather information.

• EOP-All.csv
  Earth orientation parameters. This includes $\Delta UT1$, the difference between $UT1$ and $UTC$, as well as $x_p$ and $y_p$, the polar "wander" of the Earth rotation axis. This file is updated daily with most-recent values at celestrak.org