Pith Number

pith:FQDR426Y

pith:2018:FQDR426YIL7S3LTLTP37ANG5L2

not attested not anchored not stored refs pending

SDSS J0909$+$4449: A Large-separation Strongly Lensed Quasar at $z \sim 2.8$ with Three Images

Ismael P\'erez-Fournon, N. Wyn Evans, Rui Marques-Chaves, Yiping Shu

arxiv:1809.07337 v1 · 2018-09-19 · 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{FQDR426YIL7S3LTLTP37ANG5L2}

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.

Cited by

1 paper in Pith

COOL-LAMPS IX: A Rare Duo of Quasars Each Lensed by a Single Massive Galaxy Cluster

Receipt and verification

First computed	2026-05-18T00:04:54.396845Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2c071e6bd842ff2dae6b9bf7f034dd5e8dff2a4aff12e83b8a0c555381c231bb

Aliases

arxiv: 1809.07337 · arxiv_version: 1809.07337v1 · doi: 10.48550/arxiv.1809.07337 · pith_short_12: FQDR426YIL7S · pith_short_16: FQDR426YIL7S3LTL · pith_short_8: FQDR426Y

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/FQDR426YIL7S3LTLTP37ANG5L2 \
  | 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: 2c071e6bd842ff2dae6b9bf7f034dd5e8dff2a4aff12e83b8a0c555381c231bb

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b274824ae4f14e6d09f353333a3982451da0062b8ed3a52d0be62b87cfc45e89",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2018-09-19T18:00:02Z",
    "title_canon_sha256": "2d9a85cbcdae3398bfd18c01c017f879b8fc0954b34a2f15fc447e17aa9b42b7"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1809.07337",
    "kind": "arxiv",
    "version": 1
  }
}