Pith Number

pith:QOA76FSI

pith:2013:QOA76FSIR4XHVLYT4YNFIAFOID

not attested not anchored not stored refs pending

R144 revealed as a double-lined spectroscopic binary

A. de Koter, A.F.J. Moffat, D.R. Gies, F.R.N. Schneider, F. Tramper, H. Sana, L.E. Ellerbroek, L. Kaper, O. Schnurr, T. van Boeckel

arxiv:1304.4591 v1 · 2013-04-16 · astro-ph.SR

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{QOA76FSIR4XHVLYT4YNFIAFOID}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

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.

Receipt and verification

First computed	2026-05-18T03:27:44.242667Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8381ff16488f2e7aaf13e61a5400ae40f0019326b8b278c84da26603426e1616

Aliases

arxiv: 1304.4591 · arxiv_version: 1304.4591v1 · doi: 10.48550/arxiv.1304.4591 · pith_short_12: QOA76FSIR4XH · pith_short_16: QOA76FSIR4XHVLYT · pith_short_8: QOA76FSI

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/QOA76FSIR4XHVLYT4YNFIAFOID \
  | 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: 8381ff16488f2e7aaf13e61a5400ae40f0019326b8b278c84da26603426e1616

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "cd7d92f87e5bd70f4988698ed18613f4ce8d93b9135d55f66b1db3fd8f7f74fd",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2013-04-16T20:00:01Z",
    "title_canon_sha256": "71b556241302985a4b565a420458a753308628ee3681d34cfb312db55995d4a4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1304.4591",
    "kind": "arxiv",
    "version": 1
  }
}