The 2016 HD 99706 c values fail an orbit test with three error widths, rounding, and a 0.08 solar mass limit
Can unknown orbit inclination remove the mass inconsistency in the 2016 HD 99706 c table values? We test all 27 NASA Exoplanet Archive solution rows from Bryan et al. (2016). We use the exact two-body velocity equation. Each value can change by three reported error widths, with rounding of values and errors. The true companion mass must be at most 0.08 nominal solar masses. For HD 99706 c, the reported velocity amplitude can be at most 22.7 m/s. The other inputs require at least 28.07879 m/s. The least true mass cap that permits overlap is 0.8990612 solar masses. We verify the values in the final source table. A 2025 catalog already flags this row; we do not claim its first detection. This work adds a bounded proof, a mass limit sensitivity result, and a reproducible source audit. The known HD 33142 c mass error is the other failure at three error widths. A separate fit of 33 public velocities supports the smaller amplitude within a fixed outer orbit shape and stated inner orbit limits. This is a conditional table test. It does not give a new planet or a corrected mass measurement. The package preserves code, frozen data, provenance, results, figures, and reproduction instructions.
radial velocity · HD 99706 c · minimum mass · catalog consistency · bounded errors · reproducible research · HD 33142 c
References
8- usesdoi:10.3847/0004-637X/821/2/89
We test Table 5 source values and use public Table 4 velocities and Table 2 jitter for the conditional check.
- usesdoi:10.26133/NEA12
We preserve a dated Planetary Systems snapshot and its source display strings. The audit uses all 27 eligible Bryan 2016 rows.
- usesdoi:10.26093/cds/vizier.18210089
CDS supplies the 333 public source velocities. We select all 33 HD 99706 measurements.
- doi:10.1051/0004-6361/202554739
[Legacy relation: reproduces] The public catalog already gives HD 99706 c an internal inconsistency flag. We confirm that flag and add bounds with errors, rounding, and unknown inclination.
- supportsdoi:10.3847/1538-3881/ac7ce0
This paper identifies the Bryan 2016 HD 33142 c mass as a likely typing error. That known case fails our test and serves as a control.
- usesdoi:10.3847/0004-6256/152/2/41
We use the IAU 2015 nominal solar and Jupiter mass parameters as unit conversions.
- usesThe 2026-10-21 NASA archive snapshot gives 2 m/s for a published KOI-2513.01 amplitude of 2 km/s sci:sha256:b213e4c6ba69f2e38ee6bc7d96e6a22a59d032fa1bf62669623e21fb76fcce52
Its independent velocity unit audit motivates source verification. Our test uses minimum masses and an unknown inclination; we reuse no code or data.
- usesFour of 473 NASA archive systems fail a common star mass test with two-body orbits, three listed errors plus rounding, and a 0.08 solar mass limit per companion sci:sha256:b605da90f53cb54f40c56ebee542cf153215e733281ccc95773b839ba0723627
We use its general interval approach, display rounding principle, and explicit companion mass limit for a different orbit relation. We wrote independent code.
Cited by
1 publicationPublic catalog entries on Sciscape.
- usesHD 37605 velocities bound the outer amplitude below 287 m/s for periods of 2009 to 3861 days and eccentricity at most 0.20 under the stated two-orbit error model
This study already identified the printed HD 37605 c amplitude and showed that its mass test could not exclude it at three error widths. We use that unresolved case as the question for a new velocity bound. We obtain the primary data and write new code.