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This web service allows to compute orbits for any given star, knowing its present position and 3D velocities. It is based on a Galactic gravitational potential driven by the Besançon Galaxy Model mass distribution. The details of the computation of this non-axisymmetric model are presented in Jose G. Fernandez-Trincado PhD thesis (2017) and shortly in a refered paper (Fernandez-trincado et a. in prep). This potential has already been used for orbit computations in a number of publications.

A complete description of the model inputs can be found in (to be updated) Fernandez-Trincado et al (2017)

Default parameters are the values taken in paper of the Gaia collaboration Helmi et al. (2018),A&A, 616, A12: Gaia Data Release 2. Kinematics of globular clusters and dwarf galaxies around the Milky Way. Users can instead use their own parameters for the bar, solar motion, Sun position, etc., as they want.

Input parameters for the objects for which to integrate orbit:

Input parameters for the Galaxy model:

Input parameters for the characteristics of the integration

The service provides 2 output files. The first contains the following parameters for the portion of orbit computed for the given integration time. Coordinates are given in the referential system of the Galaxy (*_inert) and in the referential of the bar (*_bar). Units are Gyr for time, kpc for distances and km/s for velocities:

The second file contains the orbit and values at a given time along the orbit. Coordinates are given in the referential system of the Galaxy (columns 3 to 8) and in the referential of the bar (columns 9 to 14): We also give 2 images showing the orbit computed, points color-coded with the time, on the 3 projections XY, YZ, XZ.


GravPot16 Publications

  1. Tang, Baitian et al. (2018), ApJ, Accepted: CN-STRONG METAL-POOR FIELD STARS IN LAMOST DR3
  2. Helmi, A. et al. (2018),A&A, 616, A12: Gaia Data Release 2. Kinematics of globular clusters and dwarf galaxies around the Milky Way
  3. Schiappacasse-Ulloa, J. et al. 2018, AJ, 156, 94: A Chemical and Kinematical Analysis of the Intermediate-age Open Cluster IC 166 from APOGEE and Gaia DR2
  4. Friedrich Anders et al. 2018, IAU Symposium, 334, 153: The DR14 APOGEE-TGAS catalogue: Precise chemo-kinematics in the extended solar vicinity
  5. Contreras Ramos, Rodrigo et al. 2018, ApJ, 863, 78: The Orbit of the New Milky Way Globular Cluster FSR1716 = VVV-GC05
  6. Fernández-Alvar, Emma, et al. 2018, MNRAS, submitted: The metal-rich halo component extended in z: a characterization with Gaia DR2 and APOGEE
  7. Tang, Baitian et al. 2018, ApJ, 855, 38: The Metal-poor non-Sagittarius (?) Globular Cluster NGC 5053: Orbit and Mg, Al, and Si Abundances
  8. Libralato, Mattia et al. 2018, ApJ, 854, 45: The HST Large Programme on ω Centauri. III. Absolute Proper Motion
  9. Fernandez-Trincado et al. 2017, SF2A-2017, 199: Abundance anomalies in red giants with possible extragalactic origins unveiled by APOGEE-2
  10. Fernandez-Trincado et al. 2017, SF2A-2017, 193: New insights on the origin of the High Velocity Peaks in the Galactic Bulge
  11. Albareti et al. 2017, ApJS, 233, 25: The 13th Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-IV Survey Mapping Nearby Galaxies at Apache Point Observatory
  12. Recio-Blanco et al. 2017, A&A Letters, 602, L14: The Gaia-ESO Survey: Low-α element stars in the Galactic bulge
  13. Fernandez-Trincado et al. 2017, ApJ, 833, 132: Discovery of a Metal-poor Field Giant with a Globular Cluster Second-generation Abundance Pattern
  14. Fernandez-Trincado et al. 2016, MNRAS, 461, 1404: Close encounters involving RAVE stars beyond the 47 Tucanae tidal radius
  15. Fernandez-Trincado et al. 2015, A&A, 583, A76: RAVE stars tidally stripped or ejected from the {$\omega$} Centauri globular cluster


Simulations are made at your own risks. The authors are not responsible for wrong applications of their model.

In case you would like complementary informations, you may contact the authors directly (modele[at]

Changes log

This is the first version of the Gravpot16 code (version described in J.G. Fernandez-Trincado et al, in prep)