Pith Number

pith:OOAXVUA3

pith:2026:OOAXVUA35SVRAJGZI2QQXYVTJV

not attested not anchored not stored refs pending

Orbital motion and dynamical mass of the complex periodic variable binary system 2MASS J05082729-2101444

A. Quirrenbach, A. Reiners, \'A. S\'anchez-Monge, A. Schweitzer, D. Montes, D. Vigan\`o, E. Ilin, F. Murgas, G. N. Ortiz-Le\'on, I. Ribas, J. A. Caballero, J. C. Morales, J. I. Vico Linares, J. M. Girart, M., M. P\'erez-Torres, M. Zechmeister, \'O. Morata, P. J. Amado, R. Zapatero Osorio, S. Curiel, S. Kaur, Th. Henning, V. J. S. B\'ejar, Y. Shan

Combined radio astrometry, radial velocities, and imaging yield a dynamical mass of 0.459 solar masses for the eccentric M-dwarf binary 2M0508-21.

arxiv:2605.04173 v2 · 2026-05-05 · astro-ph.SR · astro-ph.EP

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\usepackage{pith}
\pithnumber{OOAXVUA35SVRAJGZI2QQXYVTJV}

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Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Claims

C1strongest claim

The combined fit shows that 2M0508-21 is an M-dwarf binary with a total dynamical mass of 0.459±0.007 M⊙, assuming Gaia parallax.

C2weakest assumption

The Gaia parallax is taken as exact for converting the measured angular semimajor axis (26.964 mas) into physical units before applying Kepler's third law to obtain mass.

C3one line summary

The binary 2M0508-21 has an eccentric orbit (e=0.71, P=2.19 yr) and total dynamical mass 0.459±0.007 M⊙ derived from VLBA astrometry, 119 radial velocities, and one Keck AO point, assuming Gaia parallax.

Formal links

2 machine-checked theorem links

Cited by

1 paper in Pith

Ultra-Precise Astrometric Search for Exoplanets with SKA-VLBI

Receipt and verification

First computed	2026-05-29T01:05:11.756554Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

73817ad01becab1024d946a10be2b34d7d51a017df61ba32d9bca9063bb869cb

Aliases

arxiv: 2605.04173 · arxiv_version: 2605.04173v2 · doi: 10.48550/arxiv.2605.04173 · pith_short_12: OOAXVUA35SVR · pith_short_16: OOAXVUA35SVRAJGZ · pith_short_8: OOAXVUA3

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/OOAXVUA35SVRAJGZI2QQXYVTJV \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 73817ad01becab1024d946a10be2b34d7d51a017df61ba32d9bca9063bb869cb

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7ece05424c87f5496d33dd241e73edf8f2fef4a03a886af4c3afa4e10cfbfb99",
    "cross_cats_sorted": [
      "astro-ph.EP"
    ],
    "license": "http://creativecommons.org/licenses/by-nc-sa/4.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2026-05-05T18:11:46Z",
    "title_canon_sha256": "0c1fda521b2ddc40e10ebc0c01ea701c88766121ba66adfabb0f567c04f351b1"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.04173",
    "kind": "arxiv",
    "version": 2
  }
}