Pith Number

pith:F4MDVNGH

pith:2009:F4MDVNGHI73JACUB3INEPIORQA

not attested not anchored not stored refs pending

Photometric observations of selected, optically bright quasars for Space Interferometry Mission and other future celestial reference frames

Gregory S. Hennessey, Kenneth J. Johnston, Norbert Zacharias, Ralph A. Gaume, Roopesh Ojha

arxiv:0907.5171 v1 · 2009-07-29 · astro-ph.CO

Open paper page JSON Open Graph Bundle Merged state What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{F4MDVNGHI73JACUB3INEPIORQA}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more

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	2026-05-18T02:12:46.487203Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2f183ab4c747f6900a81da1a47a1d180110548845e614a89bd7850dab1c8f7b3

Aliases

arxiv: 0907.5171 · arxiv_version: 0907.5171v1 · doi: 10.48550/arxiv.0907.5171 · pith_short_12: F4MDVNGHI73J · pith_short_16: F4MDVNGHI73JACUB · pith_short_8: F4MDVNGH

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/F4MDVNGHI73JACUB3INEPIORQA \
  | 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: 2f183ab4c747f6900a81da1a47a1d180110548845e614a89bd7850dab1c8f7b3

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b82e0dbc6c441877d3a3645a9a671deca7018e6ca6feae8211e36c4a859e9fa1",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2009-07-29T16:15:53Z",
    "title_canon_sha256": "139eb43cf1db6910702e50cde1699d197cc58f1ae35d9e49405f0a2958dbf3ac"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0907.5171",
    "kind": "arxiv",
    "version": 1
  }
}