Pith Number

pith:H7OKKA6I

pith:2005:H7OKKA6IMRWHUE3F6MZ5OP2VLT

not attested not anchored not stored refs pending

Squared visibility estimator. Calibrating biases to reach very high dynamic range

G. Perrin, S. T. Ridgway

arxiv:astro-ph/0502442 v1 · 2005-02-22 · 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{H7OKKA6IMRWHUE3F6MZ5OP2VLT}

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	2026-07-04T16:50:52.112254Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3fdca503c8646c7a1365f333d73f555ce3a528df2db7335b096f905b2cb39789

Aliases

arxiv: astro-ph/0502442 · arxiv_version: astro-ph/0502442v1 · doi: 10.48550/arxiv.astro-ph/0502442 · pith_short_12: H7OKKA6IMRWH · pith_short_16: H7OKKA6IMRWHUE3F · pith_short_8: H7OKKA6I

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/H7OKKA6IMRWHUE3F6MZ5OP2VLT \
  | 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: 3fdca503c8646c7a1365f333d73f555ce3a528df2db7335b096f905b2cb39789

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "1f990670427c2c5afc2f487d208e287a0949f74acf9bb6503b43b1e8b508d5a2",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2005-02-22T09:04:54Z",
    "title_canon_sha256": "778ef7415baecada0c3e4d6cfe27c16fd052f0cdd93c756ab9c31fc74216f06d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0502442",
    "kind": "arxiv",
    "version": 1
  }
}