Pith Number

pith:BUDL56DM

pith:2015:BUDL56DMMOHDBGOGPDUWBOEOHG

not attested not anchored not stored refs pending

The H\alpha\ surface brightness - radius relation: a robust statistical distance indicator for planetary nebulae

David J. Frew, I.S. Bojicic, Q. A. Parker

arxiv:1504.01534 v3 · 2015-04-07 · 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{BUDL56DMMOHDBGOGPDUWBOEOHG}

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	2026-05-18T01:26:18.506071Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

0d06bef86c638e3099c678e960b88e39824eebc2234586b669ee4e26596ecc48

Aliases

arxiv: 1504.01534 · arxiv_version: 1504.01534v3 · doi: 10.48550/arxiv.1504.01534 · pith_short_12: BUDL56DMMOHD · pith_short_16: BUDL56DMMOHDBGOG · pith_short_8: BUDL56DM

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/BUDL56DMMOHDBGOGPDUWBOEOHG \
  | 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: 0d06bef86c638e3099c678e960b88e39824eebc2234586b669ee4e26596ecc48

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "348279e6575f90a9426f03320e8c59de20b00c75769547fff10ce136f3cc8b20",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2015-04-07T09:39:28Z",
    "title_canon_sha256": "784a40c6c352fa918a0c19b20168671b68570ca130183cb8ee725d8c9c394037"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1504.01534",
    "kind": "arxiv",
    "version": 3
  }
}