Pith Number

pith:EHAYWAM5

pith:2009:EHAYWAM52JERRHWQLMMTICSL3O

not attested not anchored not stored refs pending

Period-Luminosity Relation for Type II Cepheids

(2) Department of Astronomy, 3), (3) South African Astronomical Observatory), John W. Menzies (3) ((1) Institute of Astronomy, Michael W. Feast (2, Noriyuki Matsunaga (1), University of Cape Town, University of Tokyo

arxiv:0907.4013 v1 · 2009-07-23 · astro-ph.SR · astro-ph.GA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{EHAYWAM52JERRHWQLMMTICSL3O}

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	2026-05-18T02:12:54.386731Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

21c18b019dd249189ed05b19340a4bdb96d01a0ebc26bf74c37e50798aa934f7

Aliases

arxiv: 0907.4013 · arxiv_version: 0907.4013v1 · doi: 10.48550/arxiv.0907.4013 · pith_short_12: EHAYWAM52JER · pith_short_16: EHAYWAM52JERRHWQ · pith_short_8: EHAYWAM5

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/EHAYWAM52JERRHWQLMMTICSL3O \
  | 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: 21c18b019dd249189ed05b19340a4bdb96d01a0ebc26bf74c37e50798aa934f7

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "1f819c73b1efea9a59b35fc49b14e55c454a37c551e85ab640cabef56f1938e0",
    "cross_cats_sorted": [
      "astro-ph.GA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2009-07-23T09:27:07Z",
    "title_canon_sha256": "eaf28029c3ab470c17e59f7ce6e510ee561076d78a5415c74e60d231ff6e623b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0907.4013",
    "kind": "arxiv",
    "version": 1
  }
}