Pith Number

pith:RP7HEAPR

pith:1999:RP7HEAPR6ZURQCUWOMT3M2KR5H

not attested not anchored not stored refs pending

HS 1603+3820: a bright z(em)=2.51 quasar with a very rich heavy element absorption spectrum

A. Dobrzycki (Harvard-Smithsonian Center for Astrophysics), D. Engels, H.-J. Hagen (Hamburger Sternwarte)

arxiv:astro-ph/9908134 v1 · 1999-08-12 · 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{RP7HEAPR6ZURQCUWOMT3M2KR5H}

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	2026-05-18T04:21:32.097043Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8bfe7201f1f669180a967327b66951e9c6c4f1075545beba720171f81637734c

Aliases

arxiv: astro-ph/9908134 · arxiv_version: astro-ph/9908134v1 · doi: 10.48550/arxiv.astro-ph/9908134 · pith_short_12: RP7HEAPR6ZUR · pith_short_16: RP7HEAPR6ZURQCUW · pith_short_8: RP7HEAPR

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/RP7HEAPR6ZURQCUWOMT3M2KR5H \
  | 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: 8bfe7201f1f669180a967327b66951e9c6c4f1075545beba720171f81637734c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "da3e41f0769e756c485c43e0c3e553d617e4d390ebf9cdb8a3a521dc2fea39f2",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1999-08-12T14:54:35Z",
    "title_canon_sha256": "12b234ff991eed8ee555abeb1e67be5b88325508612a40646de88db4abafbbe7"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9908134",
    "kind": "arxiv",
    "version": 1
  }
}