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astro-ph.IM · Instrumentation and Methods for Astrophysicsastro-ph.HE · High Energy Astrophysical Phenomena

An orbit and precession combination removes over 99% of 6.287599-day information from 2005-2025 SS 433 BAT designs without phase cuts

The precise optical nutation period of SS 433 is close to an orbit and precession combination. We measured how this affects the separation of two free sine and cosine pairs in public Swift/BAT daily data. The calculation uses observation times and reported errors. It does not fit measured brightness. We tested 6.287599 and 6.290 days with the same baselines and weights. The baseline has a constant and six harmonics of each clock. We then add the upper combination of the second orbital harmonic and the first precession harmonic. We selected 6,823 rows from 2005 through 2025 without a precession phase cut. The precise target retains 0.225-0.622% of its baseline information. The range covers both coefficient directions and two published clock choices. The rounded target retains 32.7-36.5%. If errors are independent and correct, the precise target has an ideal standard-error increase of 12.7-21.1 times. The 2018-2025 subset also loses over 99% of precise-target information. Checks that retain two telemetry-notice dates give the same conclusion. A separate SVD calculation and joint signal injections verify the result. Each design has full rank. This exploratory extension of earlier SCI work quantifies the effect of period precision. It does not show that nutation is absent or identify the physical cause of brightness changes. The package preserves raw data, provenance, code, result tables, five figures, and reproduction instructions.

SS 433 · Swift BAT · nutation · period precision · identifiability · orbital and precession combination · public astronomical data

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References

7
  1. usesSS 433 BAT data from 2014 to 2026 do not identify a separate 6.290-day term under an orbit and precession product model sci:sha256:a768840986aa1e8d5c2fe03814c277c6319daefd96d375f2a4f5782bc71b98f1

    This study established the rounded-period model ambiguity. We extend it by comparing the precise and rounded target periods within the same BAT designs. We do not reuse its code.

  2. supportsSS 433 MAXI 4–10 keV data give a smaller 6.29-day term in 2020–2026 than in 2014–2019 with fixed clocks sci:sha256:518bbfe8f8969cc135520cfe455d464e503c438973da19780c02801536bdc309

    Our independent pure-orbit control and phase integral support its phase-selection alias result. Our main contribution is the precise-period design comparison.

  3. usesTwo fixed SS 433 profiles fitted before 2024 give 0.61% lower 2024–2026 BAT weighted RMS error at 162.375 than at 162.15 days sci:sha256:c8a0e5c8dfa5811435167a903461955baf49bd74074d408fc487a5bc7ac98d7c

    Its finding about nonstandard BAT YEAR and DAY fields led us to use MJD calendar bounds. It also supplies context for the two precession clock choices.

  4. usesdoi:10.1093/mnras/stt1715

    We use its fixed orbital and precession ephemerides, phase gate, quoted optical period and error, and reported BAT amplitude for context.

  5. usesdoi:10.1093/pasj/psaf152

    We use the precession and quadratic orbital ephemerides in Table 3 for the second clock choice. Its jet observations also define a limit on physical interpretation of a BAT brightness result.

  6. usesdoi:10.1088/0067-0049/209/1/14

    This paper describes the Swift/BAT transient monitor that supplies the public daily data.

  7. doi:10.15940/j.cnki.0001-5245.2016.02.002

    This earlier study reports that the short-period BAT feature weakens. We do not claim that a later weak feature is a new discovery.

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