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Available downloads

For those who prefer working with plain text files we offer several such files for a direct download:

  • A complete set of rectangular coordinates and velocity components of all 59 considered potential perturbers in a heliocentric, Galactic reference frame, additionally with a total perturber mass in the last column. Please note that the velocity components are expressed in parsecs per million years. For a detailed description on how these positions and velocity were obtained see our paper: 2015MNRAS.449.2459D. In the first two columns we included our internal code of the perturber and its name.
    • Download the above mentioned file here.
  • A complete list of Sun — star (or stellar system) nominal encounter parameters for all 59 considered objects. This is a result of a numerical integration of ALL these objects and the Sun SIMULTANEOUSLY, taking into account all gravitational mutual interactions and the Galactic overall potential. This calculation was performed in a Galactocentric frame and details are also available in the above mentioned paper. In each row we present: the minimal distance between the Sun and a perturber, an epoch of the encounter (negative for past events), a relative velocity during an encounter and a mass of the perturber. In the first two columns we include our internal code of the perturber and its name. The whole file is sorted by a minimal distance.
    • Download this file here
  • The third file available for download is a complete dump of all input data for all 59 individual objects in the database, i.e. positions, proper motions, radial velocities, parallaxes as well as the mass and the heliocentric distance estimations. This set consists of 54 single stars, 4 components of multiple objects and 1 component that are currently treated as single stars due to the lack or incomplete data for the rest of the multiple system. For all values both uncertainties (where available) and sources are also included. For components of P0403 and P1037 there are no input data in our database since the systemic Galactic position and velocity components, as well as their total masses, were taken directly from the literature.
    • Download this file here

Based on this current StePPeD 3.3 release we prepared a new set of numerical ephemerides providing Galactocentric positions of all potential stellar perturbers and the Sun for the past and future 30 Myr. These ephemerides can be used as the source of perturbing bodies positions for numerical studies of a long term motion of Solar System small bodies in all cases when the Galactic and stellar perturbations should be taken into account, for example in long-period comet source and origin studies. A detailed description of these ephemerides construction and the way of their effective usage can be found in a paper by Dybczyński & Breiter (A&A, Volume 657, id.A65, 2022A&A...657A..65D).