Pith Number

pith:NGY2L5UD

pith:1999:NGY2L5UD3WF7RMAKKN4PG7XH5W

not attested not anchored not stored refs pending

Optical photometry of the UCM Lists I and II

A. Gil de Paz (1) ((1)Dept.Astrofisica, J. Gallego, J. Zamorano, P. G. Perez-Gonzalez, UCM)

arxiv:astro-ph/9912104 v1 · 1999-12-06 · 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{NGY2L5UD3WF7RMAKKN4PG7XH5W}

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	2026-07-04T16:11:58.677060Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

69b1a5f683dd8bf8b00a5378f37ee7ed9680663fa33909491ab30b218fd78764

Aliases

arxiv: astro-ph/9912104 · arxiv_version: astro-ph/9912104v1 · doi: 10.48550/arxiv.astro-ph/9912104 · pith_short_12: NGY2L5UD3WF7 · pith_short_16: NGY2L5UD3WF7RMAK · pith_short_8: NGY2L5UD

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/NGY2L5UD3WF7RMAKKN4PG7XH5W \
  | 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: 69b1a5f683dd8bf8b00a5378f37ee7ed9680663fa33909491ab30b218fd78764

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "cdf637fa2f4637e4bfd51fa9eb87e87080e505f04bd586dda470c4b771b3d659",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1999-12-06T18:17:36Z",
    "title_canon_sha256": "c3031ca41f95342d7dc68406d8a036697f74c868dfe2b7f4b2044832f0b8d250"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9912104",
    "kind": "arxiv",
    "version": 1
  }
}