Pith Number

pith:I4BV44EF

pith:2013:I4BV44EFDVZEWGAHL4VWTTAXKE

not attested not anchored not stored refs pending

SALT reveals the barium central star of the planetary nebula Hen 2-39

A.A. Tyndall, A.I. Karakas, B. Miszalski, D. Jones, H.M.J Boffin, J. K\"oppen, M. Santander-Garc\'ia, P. Rodr\'iguez-Gil, S.S. Mohamed

arxiv:1309.5239 v1 · 2013-09-20 · astro-ph.SR

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{I4BV44EFDVZEWGAHL4VWTTAXKE}

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	2026-05-18T01:47:35.122037Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

47035e70851d724b18075f2b69cc17510a8be4e7d19b638f37509fb7fd2c01e8

Aliases

arxiv: 1309.5239 · arxiv_version: 1309.5239v1 · doi: 10.48550/arxiv.1309.5239 · pith_short_12: I4BV44EFDVZE · pith_short_16: I4BV44EFDVZEWGAH · pith_short_8: I4BV44EF

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/I4BV44EFDVZEWGAHL4VWTTAXKE \
  | 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: 47035e70851d724b18075f2b69cc17510a8be4e7d19b638f37509fb7fd2c01e8

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "3315d9a77c71400b053df5f3f225c5435c63f5324f3aca9dbb842b1a6ea8646a",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2013-09-20T11:30:41Z",
    "title_canon_sha256": "5f1ebf16b23c5151e274555b4482be9c274bb06d3ec0349a3d2129e81fcb4ee8"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1309.5239",
    "kind": "arxiv",
    "version": 1
  }
}