Pith Number

pith:EWKAKK3C

pith:2005:EWKAKK3CAOTGIP4EYRLQC373HJ

not attested not anchored not stored refs pending

A Neutron Star with a Massive Progenitor in Westerlund 1

C. Law, D. Pooley, F. Yusef-Zadeh, I. Negueruela, J. S. Clark, M. P. Muno, M. R. Morris, P. A. Crowther, R. de Grijs, S. L. W. McMillan, S. M. Dougherty, S. Portegies Zwart

arxiv:astro-ph/0509408 v3 · 2005-09-14 · 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{EWKAKK3CAOTGIP4EYRLQC373HJ}

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	2026-07-04T17:15:10.305971Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2594052b6203a6643f84c457016ffb3a4cf6365770902bd7e847508e88ebbaf6

Aliases

arxiv: astro-ph/0509408 · arxiv_version: astro-ph/0509408v3 · doi: 10.48550/arxiv.astro-ph/0509408 · pith_short_12: EWKAKK3CAOTG · pith_short_16: EWKAKK3CAOTGIP4E · pith_short_8: EWKAKK3C

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/EWKAKK3CAOTGIP4EYRLQC373HJ \
  | 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: 2594052b6203a6643f84c457016ffb3a4cf6365770902bd7e847508e88ebbaf6

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "1fa8cb08bb4c7057e12419678e42c57970115f8986d1d434e234080b3b6fbaf1",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2005-09-14T20:50:50Z",
    "title_canon_sha256": "3c4a41650c3c48b978ba09c3f8f72149ba9506b125558317cbe1567075f4b831"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0509408",
    "kind": "arxiv",
    "version": 3
  }
}