Pith Number

pith:BBYHB4WA

pith:1997:BBYHB4WANXQLGCC3D4TFCWUJL7

not attested not anchored not stored refs pending

Hipparcos Parallaxes and the Cepheid Distance Scale

Barry F. Madore, Wendy L. Freedman

arxiv:astro-ph/9707091 v1 · 1997-07-08 · 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{BBYHB4WANXQLGCC3D4TFCWUJL7}

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	2026-05-18T02:40:35.181823Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

087070f2c06de0b3085b1f26515a895fd3375b07494fedae84b87955fe5bc90c

Aliases

arxiv: astro-ph/9707091 · arxiv_version: astro-ph/9707091v1 · doi: 10.48550/arxiv.astro-ph/9707091 · pith_short_12: BBYHB4WANXQL · pith_short_16: BBYHB4WANXQLGCC3 · pith_short_8: BBYHB4WA

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/BBYHB4WANXQLGCC3D4TFCWUJL7 \
  | 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: 087070f2c06de0b3085b1f26515a895fd3375b07494fedae84b87955fe5bc90c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9a441a0a5ce95b8d690aec585b392e44d058ed08ca3c7481130d02e8ff1a474b",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1997-07-08T09:45:32Z",
    "title_canon_sha256": "2e91f5fa76a945774a6f74d93aea99a4dd101e0be50e594df9192c4c6744032a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9707091",
    "kind": "arxiv",
    "version": 1
  }
}