Pith Number

pith:G2XQPU6M

pith:1995:G2XQPU6MMYTLQXAHMDCXWJBUWK

not attested not anchored not stored refs pending

The Variability of Quasars. II. Frequency Dependence

A. Di Clemente, D. Trevese, E. Giallongo, F. Vagnetti, G. Natali

arxiv:astro-ph/9512159 v1 · 1995-12-23 · 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{G2XQPU6MMYTLQXAHMDCXWJBUWK}

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

Weak-emission-line quasars: A new clue from their optical variability

Receipt and verification

First computed	2026-07-04T15:58:10.690696Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

36af07d3cc6626b85c0760c57b2434b298b5be04f37c7705d31f0d940d9a3d6e

Aliases

arxiv: astro-ph/9512159 · arxiv_version: astro-ph/9512159v1 · doi: 10.48550/arxiv.astro-ph/9512159 · pith_short_12: G2XQPU6MMYTL · pith_short_16: G2XQPU6MMYTLQXAH · pith_short_8: G2XQPU6M

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/G2XQPU6MMYTLQXAHMDCXWJBUWK \
  | 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: 36af07d3cc6626b85c0760c57b2434b298b5be04f37c7705d31f0d940d9a3d6e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "cef7b04978c00d9cabd714c39bfc05b5d1849cd4a34ffbe3ee6fb7c65c56ee5e",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1995-12-23T16:42:38Z",
    "title_canon_sha256": "0b0d680266b4116d4c2519e35c2c22bccf23be6850564d587a915702026a8fcd"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9512159",
    "kind": "arxiv",
    "version": 1
  }
}