Pith Number

pith:CJDUEYLC

pith:2026:CJDUEYLCOBA7RIPTQI2G2FRK75

not attested not anchored not stored refs pending

BE Lyncis: A Pulsating Star in the Most Eccentric Binary with a Massive Unseen Companion

Hui-Fang Xue, Jia-Shu Niu, Ying Zhang

BE Lyncis is a delta Scuti star in the most eccentric binary known, hosting a likely black hole companion of at least 2.5 solar masses.

arxiv:2601.12999 v4 · 2026-01-19 · astro-ph.SR · astro-ph.HE

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\usepackage{pith}
\pithnumber{CJDUEYLCOBA7RIPTQI2G2FRK75}

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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

BE Lyn is a high-amplitude δ Scuti star in a binary with orbital period ≈15.9 years and eccentricity e=0.9989^{+0.0008}_{-0.0021} (>0.9968 at 95% confidence), the most extreme reliably measured, with dynamical constraints implying i ≲ 10.1° and companion mass M2 ≳ 2.5 M⊙, most likely a black hole.

C2weakest assumption

The light-travel time effect from the binary orbit fully accounts for the observed times of maximum light without significant contributions from other effects such as apsidal motion, mass transfer, or intrinsic period changes in the pulsator, and that the fitted orbital elements uniquely constrain the inclination to ≲10.1°.

C3one line summary

BE Lyncis is the most eccentric binary known, a pulsating star with a massive compact companion of at least 2.5 solar masses inferred to be a black hole at very low orbital inclination.

Formal links

1 machine-checked theorem link

Receipt and verification

First computed	2026-06-19T16:12:50.362197Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

12474261627041f8a1f382346d162aff6de29efc451a14c0a5e05bf17b76201f

Aliases

arxiv: 2601.12999 · arxiv_version: 2601.12999v4 · doi: 10.48550/arxiv.2601.12999 · pith_short_12: CJDUEYLCOBA7 · pith_short_16: CJDUEYLCOBA7RIPT · pith_short_8: CJDUEYLC

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/CJDUEYLCOBA7RIPTQI2G2FRK75 \
  | 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: 12474261627041f8a1f382346d162aff6de29efc451a14c0a5e05bf17b76201f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ea790c9e45ad8198581a3e25c503e127c2763f0558406cab15bc3b4820cfa604",
    "cross_cats_sorted": [
      "astro-ph.HE"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2026-01-19T12:25:59Z",
    "title_canon_sha256": "904468f3280ad511617bbc2a6d90f26e80a232d4cae5506c385b26b9ef536cfc"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2601.12999",
    "kind": "arxiv",
    "version": 4
  }
}