Pith Number

pith:PQNPKV7W

pith:2000:PQNPKV7WOEOUUAZGAJ275TCUNO

not attested not anchored not stored refs pending

Helium-like triplet density diagnostics: Applications to CHANDRA--LETGS X-ray observations of Capella and Procyon

A.J.J. Raassen, D. Porquet, J.H.M.M. Schmitt, J.S. Kaastra, J. U. Ness, P. Predehl, R.L.J. van der Meer, R. Mewe, V. Burwitz

arxiv:astro-ph/0012223 v1 · 2000-12-11 · 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{PQNPKV7WOEOUUAZGAJ275TCUNO}

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	2026-07-04T16:17:46.687850Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7c1af557f6711d4a03260275fecc546b8a209f8e54b2c285f814a6df12d13823

Aliases

arxiv: astro-ph/0012223 · arxiv_version: astro-ph/0012223v1 · doi: 10.48550/arxiv.astro-ph/0012223 · pith_short_12: PQNPKV7WOEOU · pith_short_16: PQNPKV7WOEOUUAZG · pith_short_8: PQNPKV7W

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/PQNPKV7WOEOUUAZGAJ275TCUNO \
  | 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: 7c1af557f6711d4a03260275fecc546b8a209f8e54b2c285f814a6df12d13823

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "cf8a00a262ced5a614dd58d613fe2177a46b816b173153daff154ddc3469525e",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2000-12-11T13:29:59Z",
    "title_canon_sha256": "1247bb57603595e13113fd56cc1852d0ebaa42ab214f346fed45c3800876214a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0012223",
    "kind": "arxiv",
    "version": 1
  }
}