Pith Number

pith:F5QQQOUO

pith:1999:F5QQQOUOTGOABI4EU23URPPUVF

not attested not anchored not stored refs pending

Centaurus A: multiple outbursts or bursting bubble?

N.E.B. Killeen, R.D. Ekers, R. Morganti, T.A. Oosterloo

arxiv:astro-ph/9903448 v1 · 1999-03-30 · 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{F5QQQOUOTGOABI4EU23URPPUVF}

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	2026-07-04T16:10:51.063268Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2f61083a8e999c00a384a6b748bdf4a96713fc77298d0d70121599a8f2bb67ef

Aliases

arxiv: astro-ph/9903448 · arxiv_version: astro-ph/9903448v1 · doi: 10.48550/arxiv.astro-ph/9903448 · pith_short_12: F5QQQOUOTGOA · pith_short_16: F5QQQOUOTGOABI4E · pith_short_8: F5QQQOUO

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/F5QQQOUOTGOABI4EU23URPPUVF \
  | 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: 2f61083a8e999c00a384a6b748bdf4a96713fc77298d0d70121599a8f2bb67ef

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b05af6bf97c13e2aa123717b51b19e88e3f9c2b1a33abe2fb1ff0b6941f7862d",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1999-03-30T09:29:04Z",
    "title_canon_sha256": "2f6d096d2becffe2e0e5a71025bc85a1305bbc7daf737fda2a329342f22e177b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9903448",
    "kind": "arxiv",
    "version": 1
  }
}