Pith Number

pith:T5KVBDX4

pith:2017:T5KVBDX4NUXOPRWARX6XFMLW5F

not attested not anchored not stored refs pending

A Possible ~20 yr Periodicity in Long-term Optical Photometric and Spectral Variations of the Nearby Radio-Quiet Active Galactic Nucleus Ark 120

Chen Hu, Edi Bon, Eduard K. Denissyuk, Hartmut Winkler, Jian-Min Wang, Jin-Ming Bai, Kai Wang, Kai-Xing Lu, Luis C. Ho, Luka C. Popovic, Natasa Bon, Pu Du, Rashit R. Valiullin, Wei-Hao Bian, Yan-Rong Li, Ye-Fei Yuan, Ying-Ke Huang, Zhi-Xiang Zhang

arxiv:1705.07781 v3 · 2017-05-22 · astro-ph.HE · astro-ph.GA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{T5KVBDX4NUXOPRWARX6XFMLW5F}

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	2026-07-05T00:12:49.331254Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

9f55508efc6d2ee7c6c08dfd72b176e941de5ea940ee5ab2561bb58440a4fe2c

Aliases

arxiv: 1705.07781 · arxiv_version: 1705.07781v3 · doi: 10.48550/arxiv.1705.07781 · pith_short_12: T5KVBDX4NUXO · pith_short_16: T5KVBDX4NUXOPRWA · pith_short_8: T5KVBDX4

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/T5KVBDX4NUXOPRWARX6XFMLW5F \
  | 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: 9f55508efc6d2ee7c6c08dfd72b176e941de5ea940ee5ab2561bb58440a4fe2c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "290319fda1c48a2893f110ac45c780380a930037b2047ae1c613199569d2f8f9",
    "cross_cats_sorted": [
      "astro-ph.GA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2017-05-22T14:51:04Z",
    "title_canon_sha256": "3be81713e79092e7dbab096dbe034ee6f8218b8dcac296fb3f3a8f2b1e3e714e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1705.07781",
    "kind": "arxiv",
    "version": 3
  }
}