Pith Number

pith:QQ4XQX4Z

pith:1999:QQ4XQX4ZAE4RJNNASI57XAYFGZ

not attested not anchored not stored refs pending

W Crv: The shortest-period Algol with non-degenerate components?

Slavek M. Rucinski, University of Toronto), Wenxian Lu (David Dunlap Observatory

arxiv:astro-ph/9907331 v1 · 1999-07-23 · astro-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{QQ4XQX4ZAE4RJNNASI57XAYFGZ}

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	2026-07-04T16:11:27.759448Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8439785f99013914b5a0923bfb8305367d5a3061fd09acafbc8f741512fd2199

Aliases

arxiv: astro-ph/9907331 · arxiv_version: astro-ph/9907331v1 · doi: 10.48550/arxiv.astro-ph/9907331 · pith_short_12: QQ4XQX4ZAE4R · pith_short_16: QQ4XQX4ZAE4RJNNA · pith_short_8: QQ4XQX4Z

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/QQ4XQX4ZAE4RJNNASI57XAYFGZ \
  | 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: 8439785f99013914b5a0923bfb8305367d5a3061fd09acafbc8f741512fd2199

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f8054d298fe72cb8e0bebe35aede7eca35e4f365c04e149cd18f57ebfbad6b85",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1999-07-23T18:20:02Z",
    "title_canon_sha256": "1d4de708d96b5dc6be38675d5cb4687c4a9e1724766f869c01defb52f83383d7"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9907331",
    "kind": "arxiv",
    "version": 1
  }
}