Pith Number

pith:D2APYR4Y

pith:2009:D2APYR4YGG3CEYBNFWS6545X2D

not attested not anchored not stored refs pending

Eta Carinae and the Luminous Blue Variables

Jorick S. Vink (Armagh Observatory)

arxiv:0905.3338 v2 · 2009-05-20 · astro-ph.SR · astro-ph.CO · astro-ph.GA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{D2APYR4YGG3CEYBNFWS6545X2D}

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

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	2026-05-18T02:13:38.382586Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1e80fc479831b622602d2da5eef3b7d0efaf88c0ff17fbdb4b5c1c4a22f3ca37

Aliases

arxiv: 0905.3338 · arxiv_version: 0905.3338v2 · doi: 10.48550/arxiv.0905.3338 · pith_short_12: D2APYR4YGG3C · pith_short_16: D2APYR4YGG3CEYBN · pith_short_8: D2APYR4Y

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/D2APYR4YGG3CEYBNFWS6545X2D \
  | 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: 1e80fc479831b622602d2da5eef3b7d0efaf88c0ff17fbdb4b5c1c4a22f3ca37

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6f07e17dfb587beccc7f10c53c33bd1f55086962b26f842e47ec377e4d7b8654",
    "cross_cats_sorted": [
      "astro-ph.CO",
      "astro-ph.GA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2009-05-20T15:44:29Z",
    "title_canon_sha256": "66f05fc1272ecd7e980056fd8207ec44dc26e93b366b24e91bf4c71cbe505249"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0905.3338",
    "kind": "arxiv",
    "version": 2
  }
}