Pith Number

pith:53JQCBYC

pith:1999:53JQCBYCWTSJZXUZW43DVZJWMR

not attested not anchored not stored refs pending

The Extragalactic Distance Scale Key Project XVIII. The Discovery of Cepheids and a New Distance to NGC 4535 Using the Hubble Space Telescope

A. Saha, A. Turner, B.F. Madore, B.K. Gibson, C.F. Prosser, D.D. Kelson, D.M. Rawson, F. Bresolin, G.D. Illingworth, H.C. Ford, J.A. Graham, J.G. Hoessel, J.P. Huchra, J.R. Mould, L. Ferrarese, L.M. Macri, M. Han, N.A. Silbermann, P.B. Stetson, P. Harding, R.C. Kennicutt, R.J. Hill, R.L. Phelps, S.M.G. Hughes, S. Sakai, W.L. Freedman

arxiv:astro-ph/9901332 v1 · 1999-01-23 · 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{53JQCBYCWTSJZXUZW43DVZJWMR}

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	2026-07-04T16:10:38.954181Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

eed3010702b4e49cde99b7363ae53664759965af27f9f41ba8b8fcffdf0b0ce5

Aliases

arxiv: astro-ph/9901332 · arxiv_version: astro-ph/9901332v1 · doi: 10.48550/arxiv.astro-ph/9901332 · pith_short_12: 53JQCBYCWTSJ · pith_short_16: 53JQCBYCWTSJZXUZ · pith_short_8: 53JQCBYC

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/53JQCBYCWTSJZXUZW43DVZJWMR \
  | 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: eed3010702b4e49cde99b7363ae53664759965af27f9f41ba8b8fcffdf0b0ce5

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "8adac58c9277f14aeaafa5ab422abd45d862874a3b19e72dfb0d1586da4d74be",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1999-01-23T22:56:28Z",
    "title_canon_sha256": "180866114525ae045e03de5e11971d16c70a0c2d9ef391b70236e0ef0ae89e4a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9901332",
    "kind": "arxiv",
    "version": 1
  }
}