Pith Number

pith:7RTNRICR

pith:1999:7RTNRICRQC2G62EE4EO2ZK3ZLX

not attested not anchored not stored refs pending

The central stars of the planetary nebulae NGC 7027 and NGC 6543

D.A. Beintema, D.R. Boxhoorn, F. Lahuis, H. Feuchtgruber, L.B.F.M. Waters, P.A.M. van Hoof, P.W. Morris, S.R. Pottasch, Th. de Graauw

arxiv:astro-ph/9906166 v1 · 1999-06-09 · 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{7RTNRICRQC2G62EE4EO2ZK3ZLX}

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	2026-05-18T04:21:32.207641Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

fc66d8a05180b46f6884e11dacab795de8777dd24c8d92b9b88cc75f2e1c4f16

Aliases

arxiv: astro-ph/9906166 · arxiv_version: astro-ph/9906166v1 · doi: 10.48550/arxiv.astro-ph/9906166 · pith_short_12: 7RTNRICRQC2G · pith_short_16: 7RTNRICRQC2G62EE · pith_short_8: 7RTNRICR

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/7RTNRICRQC2G62EE4EO2ZK3ZLX \
  | 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: fc66d8a05180b46f6884e11dacab795de8777dd24c8d92b9b88cc75f2e1c4f16

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "1934c0c91d5c9b2bb09c183bc4469f836245ea473628ec24a656b19d522171c0",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1999-06-09T20:02:14Z",
    "title_canon_sha256": "2881b1e0c9f8e0114613ce6eea6599c52167c0fdb14b5a466b3d41d7023d625f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9906166",
    "kind": "arxiv",
    "version": 1
  }
}