Pith Number

pith:NP6G5X3P

pith:1997:NP6G5X3PIGL4EETERWR6M3WPCF

not attested not anchored not stored refs pending

The Surface Brightness Fluctuations and Globular Cluster Populations of M87 and its Companions

Eric H. Neilsen, Holland C. Ford, Jr., Zlatan I. Tsvetanov

arxiv:astro-ph/9712339 v1 · 1997-12-29 · 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{NP6G5X3PIGL4EETERWR6M3WPCF}

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	2026-05-18T03:47:42.645032Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6bfc6edf6f4197c212648da3e66ecf1169614e2418b99853e1c0477e7cb1d3f6

Aliases

arxiv: astro-ph/9712339 · arxiv_version: astro-ph/9712339v1 · doi: 10.48550/arxiv.astro-ph/9712339 · pith_short_12: NP6G5X3PIGL4 · pith_short_16: NP6G5X3PIGL4EETE · pith_short_8: NP6G5X3P

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/NP6G5X3PIGL4EETERWR6M3WPCF \
  | 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: 6bfc6edf6f4197c212648da3e66ecf1169614e2418b99853e1c0477e7cb1d3f6

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5badbda956cacc32b1551e9e5067801ec746c21b1808ebc3a20fcce91565a75d",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1997-12-29T18:04:49Z",
    "title_canon_sha256": "33b9ddb92187669be35a5d38dc76645a7970dc1f1e606b78ea31d0388f90e712"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9712339",
    "kind": "arxiv",
    "version": 1
  }
}