Pith Number

pith:VKEBCPYQ

pith:2009:VKEBCPYQFTJMFXHUNIV6L6XH53

not attested not anchored not stored refs pending

Expansion parallax of the planetary nebula IC 418

Christophe Morisset (IA-UNAM), Laurent Loinard (CRyA-UNAM), Lizette Guzman (CRyA-UNAM), Yolanda Gomez (CRyA-UNAM)

arxiv:0905.0021 v1 · 2009-04-30 · 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{VKEBCPYQFTJMFXHUNIV6L6XH53}

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	2026-05-18T02:13:48.619397Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

aa88113f102cd2c2dcf46a2be5fae7eeeeec6700845311d5487ffe8c0c4a72f2

Aliases

arxiv: 0905.0021 · arxiv_version: 0905.0021v1 · doi: 10.48550/arxiv.0905.0021 · pith_short_12: VKEBCPYQFTJM · pith_short_16: VKEBCPYQFTJMFXHU · pith_short_8: VKEBCPYQ

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/VKEBCPYQFTJMFXHUNIV6L6XH53 \
  | 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: aa88113f102cd2c2dcf46a2be5fae7eeeeec6700845311d5487ffe8c0c4a72f2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "12d0d3f8a871befb37f186d191de83ba9126f25ebb1a88461d138547ed697dcf",
    "cross_cats_sorted": [
      "astro-ph.GA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2009-04-30T22:29:47Z",
    "title_canon_sha256": "b8ede72e28e0762a8eabd83e459d9752a17453ac6892ba56c8afc02ff813e3d5"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0905.0021",
    "kind": "arxiv",
    "version": 1
  }
}