Pith Number

pith:PKXUDL42

pith:2011:PKXUDL42PFL7SME6WSFHJTCLCV

not attested not anchored not stored refs pending

First detection of period doubling in a BL Herculis type star. Observations and theoretical models

A. Udalski, G. Pietrzynski, I. Soszynski, K. Ulaczyk, L. Wyrzykowski, M. K. Szymanski, M. Kubiak, P. Moskalik, P. Pietrukowicz, R. Poleski, R. Smolec, S. Kozlowski

arxiv:1112.0012 v1 · 2011-11-30 · astro-ph.SR

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{PKXUDL42PFL7SME6WSFHJTCLCV}

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	2026-05-18T03:41:40.437451Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7aaf41af9a7957f9309eb48a74cc4b1566c360ccd6cfbe7065da43c7ab695988

Aliases

arxiv: 1112.0012 · arxiv_version: 1112.0012v1 · doi: 10.48550/arxiv.1112.0012 · pith_short_12: PKXUDL42PFL7 · pith_short_16: PKXUDL42PFL7SME6 · pith_short_8: PKXUDL42

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/PKXUDL42PFL7SME6WSFHJTCLCV \
  | 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: 7aaf41af9a7957f9309eb48a74cc4b1566c360ccd6cfbe7065da43c7ab695988

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7511c538d521f0bdf5eebd8246cbc4a8cf67b6fca121a0685a8913524eb1867b",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2011-11-30T21:00:12Z",
    "title_canon_sha256": "855c8d49fb61a076b05ff27258ea00efd08d1bc3c3c47cd2905aca9685f3e293"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1112.0012",
    "kind": "arxiv",
    "version": 1
  }
}