Pith Number

pith:7L7T5WXQ

pith:2004:7L7T5WXQUFJHAKAA6PSLKKIEAC

not attested not anchored not stored refs pending

WR 20a is an Eclipsing Binary: Accurate Determination of Parameters for an Extremely Massive Wolf-Rayet System

A. Udalski, A. Z. Bonanos, G. Pietrzynski, I. Soszynski, K. Zebrun, K. Z. Stanek, L. Wyrzykowski, M. K. Szymanski, M. Kubiak, O. Szewczyk

arxiv:astro-ph/0405338 v2 · 2004-05-18 · 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{7L7T5WXQUFJHAKAA6PSLKKIEAC}

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	2026-07-04T16:43:47.307786Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

faff3edaf0a152702800f3e4b529040099426e9e660c589baf61f22d14492081

Aliases

arxiv: astro-ph/0405338 · arxiv_version: astro-ph/0405338v2 · doi: 10.48550/arxiv.astro-ph/0405338 · pith_short_12: 7L7T5WXQUFJH · pith_short_16: 7L7T5WXQUFJHAKAA · pith_short_8: 7L7T5WXQ

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/7L7T5WXQUFJHAKAA6PSLKKIEAC \
  | 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: faff3edaf0a152702800f3e4b529040099426e9e660c589baf61f22d14492081

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5206f51e009149717387f0cc9c5467248fb399e4f121c24378a2f780888eee39",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2004-05-18T16:54:12Z",
    "title_canon_sha256": "39af607b072c9fa3b343d0ee86e6ccbaf95e6884665de2eaaf8e4b14a7e5a0ac"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0405338",
    "kind": "arxiv",
    "version": 2
  }
}