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Table 3
Joint astrometric-spectroscopic model parameters.
| Property | Unit | Description | Prior |
|---|---|---|---|
| Spectroscopic parameters | |||
| P | d | Orbital period |  |
| K1 | m s−1 | Radial velocity semi-amplitude |  |
 |
– | Paramaterized variable of eccentricity and argument of periastron |  (a) |
 |
– | Paramaterized variable of eccentricity and argument of periastron |  (a) |
| τ | – | Mean anomaly at reference epoch (51000 MJD) in fractions of P |  |
| γ1991.25 | m s−1 | Radial velocity of π Mensae system barycenter at 1991.25 (48348.25 MJD) |  |
| ΔvH2 | m s−1 | Radial velocity offset for post-upgrade HARPS |  |
| ΔvU | m s−1 | Radial velocity offset for UCLES |  |
| ɛH1 | m s−1 | Error inflation for HARPS1 |  (b) |
| ɛH2 | m s−1 | Error inflation for HARPS2 |  (b) |
| ɛU | m s−1 | Error inflation for UCLES |  (b) |
| ɛHIP | mas | Error inflation for HIPPARCOS abscissa measurements |  (b) |
| Astrometric parameters | |||
| cos i | – | Cosine of the orbital inclination |  |
| Ω | deg | Position angle of the ascending node |  |
| M1 | M⊙ | Mass of primary star |  |
| Δα⋆ | mas | R.A. offset between HIPPARCOS measurement and barycenter at 1991.25 |  |
| Δδ | mas | Dec. offset – –” – – |  |
| Δϖ | mas | Parallax offset – –” – – |  |
 |
mas yr−1 | RA proper motion offset – –” – – |  |
| Δμδ | mas yr−1 | Dec proper motion offset – –” – – |  |
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